©2009 TOSHIBA TEC CORPORATION All rights reserved
1
Security Target For
June 11, 2009
Ver 1.1
This document is a translation of the evaluated and certified security target written in Japanese
©2009 TOSHIBA TEC CORPORATION All rights reserved
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Table of Contents
Terms and Abbreviations....................................................................................3
Resource terms........................................................................................................................................... 3
TOE-related terms and abbreviations ....................................................................................................... 4
CC-related abbreviations ........................................................................................................................... 5
Trademarks ................................................................................................................................................. 5
1. SECURITY TARGET INTRODUCTION.........................................................6
1.1 Reference to ST................................................................................................................................ 6
1.2 Reference to TOE............................................................................................................................. 6
1.3 TOE Overview................................................................................................................................... 6
1.3.1 Explanation about TOE........................................................................................................... 6
1.3.2 Usage of TOE........................................................................................................................... 7
1.3.3 Hardware, software and firmware other than required for TOE.......................................... 8
1.3.4 TOE-related Personnel............................................................................................................ 8
1.3.5 Secured Assets ....................................................................................................................... 9
1.4 TOE Description............................................................................................................................. 10
1.4.1 TOE Physical Range ............................................................................................................. 10
1.4.1.1 Configuration in Normal Mode .................................................................................. 10
1.4.1.2 Configuration in Self-Diagnostic Mode .................................................................... 12
1.4.2 Logical Range of TOE........................................................................................................... 13
1.4.2.1 General Functions of the e-STUDIO in Normal Mode.............................................. 13
1.4.2.2 Security Function (Data Overwrite Function) in Normal Mode............................... 15
1.4.2.3 Settings for Maintenance/Device Information Display in Self-Diagnostic Mode... 16
1.4.2.4 Security Functions in Self-Diagnostic Mode............................................................ 16
1.4.3 Identification of Guidance Configuring the TOE ................................................................ 17
2. CONFORMANCE CLAIMS..........................................................................18
2.1 Conformance Claims to the CC .................................................................................................... 18
2.2 Protection Profile (PP) Claims, Package Claims ......................................................................... 18
2.3 Conformance Rationale................................................................................................................. 18
3. SECURITY PROBLEM DEFINITION...........................................................19
3.1 Threats ............................................................................................................................................ 19
3.2 Organizational Security Policies................................................................................................... 19
3.3 Assumptions .................................................................................................................................. 19
4. SECURITY OBJECTIVES ...........................................................................20
4.1 Security Objectives for the TOE ................................................................................................... 20
4.2 Security Objectives for the Operating Environment ................................................................... 20
4.3 Security Objectives Rationale....................................................................................................... 21
5. EXTENDED COMPONENTS DEFINITION .................................................22
6. SECURITY REQUIREMENTS.....................................................................23
6.1 TOE Security Functional Requirements....................................................................................... 23
6.2 TOE Security Assurance Requirements....................................................................................... 24
6.3 Security Requirements Rationale ................................................................................................. 25
6.3.1 Security Functional Requirement Rationale....................................................................... 25
6.3.2 Security Assurance Requirements Rationale..................................................................... 25
7. TOE SUMMARY SPECIFICATION .............................................................26
7.1 Data Overwrite Function................................................................................................................ 26
7.2 Forcible Data Overwrite Function................................................................................................. 26
©2009 TOSHIBA TEC CORPORATION All rights reserved
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Terms and Abbreviations
The terms, abbreviations and trademarks used in this ST are described below:
yResource terms
User document Documents that users possess, such as Word, Excel, PDF, along with
text documents and JPEG images.
User document data Electronic user documents which exist in the MFP. This includes user
documents computerized and input by the scanner, electronic
documents that the MFP has received, and the data generated by
processing them in the MFP.
Resource Physical components taking in the TOE, digital components such as
built-in fonts and consumables for the TOE such as toner.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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yTOE-related terms and abbreviations
MFP
(Multifunction Peripherals)
Multifunction peripheral (digital multifunction device), which integrates
mainly copy, scan, print and Fax functions into a single device.
e-STUDIO Multifunction peripheral (digital multifunction device), which integrates
mainly copy, scan, print and Fax functions into a single device.
In this ST, it refers to the e-STUDIO205L/255/305/355/455.
General functions of the e-
STUDIO
Copy, scan, print, Fax and e-Filing Box/shared folder functions, which
are integrated into the e-STUDIO and available for general users.
Job A unit used for processing the general functions of the e-STUDIO.
The user document data temporarily written into the HDD for
processing during a job or when a job is finished (or cancelled) are
permanently erased by the TSF.
TopAccess A web-based job/device management tool, which enables users to
obtain information about the eSTUDIO via the Internet and use two
types of web sites, for users and for administrators.
e-Filing Box The location where users save user document data.
After saving data, users can refer to, print or edit them on the control
panel or in TopAccess.
When the file retention period expires, the saved user document data
are deleted.
Shared folder The location where users can save user document data in file formats
such as JPEG and PDF and obtain files from client PCs on the
Internet.
When the file retention period expires, the saved user document data
are deleted.
Internet Fax It conducts communications through LAN network to send original
documents in TIFF-FX (Profile S) -format attached files by e-mail.
One of its advantages is less communications cost and higher
resolution than a normal facsimile machine.
Data can be sent and received by Internet Fax between compatible
models. In addition, documents and images can be sent from a PC
and received by a compatible model as the Internet fax. When data
are sent from a compatible model to a PC, the PC receives the data as
email messages.
When receiving an Internet Fax, the main unit automatically outputs it
just as a normal facsimile machine does.
WS-Scan WS (Web Service) Scan is a function that performs scanning on a
Windows Vista computer through the network using the functions of
the computer.
Images scanned by the main unit can be saved into a computer. In
addition, images can be acquired by sending a scan request from a
WIA (Windows Imaging Acquisition) Scan Driver-compatible
application to the main unit.
Deletion To deallocate resources and make data unavailable for users.
Erase To erase data without leaving traces.
Complete erase To permanently erase data to prevent the reuse of user document data
by overwriting the areas for the data to be deleted with useless data.
GP-1070，GP-1140 Device for security license registration by connecting to the e-
STUDIO205L/255/305/355/455. The security functions in the system
software are enabled when the license is registered.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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yCC-related abbreviations
CC Common Criteria
EAL Evaluation Assurance Level
PP Protection Profile
SOF Strength Of Function
ST Security Target
TOE Target Of Evaluation
TSF TOE Security Function
SFR Security Functional Requirement
yTrademarks
y The official name of Windows Vista is Microsoft Windows Vista Operating System.
y Microsoft, Windows, Windows NT, and the names and the product names of other Microsoft
products are registered trademarks or trademarks in the United States and other countries of
Microsoft Corporation of the U.S.
y All other product names mentioned in this ST may be trademarks or registered trademarks of their
respective owners.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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1. SECURITY TARGET INTRODUCTION
This chapter describes reference to security target (hereinafter referred to as "ST"), reference to target of
evaluation (hereinafter referred to as "TOE") and conformance to the Common Criteria (hereinafter referred
to as "CC").
1.1 Reference to ST
Information to identify this ST is described below:
ST Title: Security Target for e-STUDIO205L/255/305/355/455
ST Version: Ver1.1
ST Created on: June 11, 2009
ST Created by: Toshiba TEC Corporation
Evaluation Assurance Level: EAL3
Criteria: Common Criteria for Information Technology Security Evaluation
Version 3.1
Part 1: Introduction and general model Revision 1 (CCMB-2006-09-001)
Part 2: Security functional components Revision 2 (CCMB-2007-09-002)
Part 3: Security assurance components Revision 2 (CCMB-2007-09-003)
Evaluation Methodology: Common Methodology for Information Technology Security Evaluation
Version 3.1
Evaluation methodology Revision 2 (CCMB-2007-09-004)
1.2 Reference to TOE
Information to identify this TOE is described below:
TOE Title
[Japanese]: System Software for e-STUDIO205L/255/305/355/455
[English]: System Software for e-STUDIO205L/255/305/355/455
TOE Version: V3.0
TOE Developed by: Toshiba TEC Corporation
1.3 TOE Overview
1.3.1 Explanation about TOE
The TOE defined in this ST is the control software for the MFPs "e-STUDIO205L/255/305/355/455"
manufactured by Toshiba TEC Corporation. The TOE is enabled when the security functions of the e-
STUDIO are activated by the optional GP-1070 or GP-1140.
The e-STUDIO is a digital multifunction peripheral, which inputs and processes user documents. The main
functions include copy, print, Fax and e-Filing Box/shared folder functions.
When these functions are used, user document data input into the e-STUDIO is temporarily written into the
HDD and deleted after the processing is finished. However, deletion by the FAT file system does not
permanently erase data, leaving them recoverable. This also applies to the deletion of user document data
saved in the e-Filing Box/shared folder.
The TOE enables deletion of user document data written into the HDD and permanently erases them from
the HDD in an unrecoverable manner when the e-STUDIO functions are used. In addition, before the HDD
is disposed of or replaced, a service engineer erases data in all memory areas, permanently erasing all user
document data in the HDD.
The e-STUDIO205L and e-STUDIO305 will not be marketed for Japan.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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1.3.2 Usage of TOE
This ST defines five types of MFPs, the e-STUDIO205L, e-STUDIO255, e-STUDIO305, e-STUDIO355 and
e-STUDIO455, each having a different print speed. The TOE is the common control software among them.
As shown in Figure 1.3.2 below, the e-STUDIO is used as a terminal to send/receive data to/from facsimile
machines, a terminal to send email messages to email servers, and a remote printer for remote PCs in
network environments as well as installed in general offices as a standalone device.
Figure 1.3.2 Use of the e-STUDIO in Network Environment
The security functions as the optional functions of the e-STUDIO are enabled when a service engineer uses
the GP-1070 or GP-1140 to register the license in the e-STUDIO. The license of the TOE is always
enabled.
The enabled security functions erase data in an unrecoverable manner to delete them in the following
situations:
When the e-STUDIO deletes user document data during a job specified by the user or after the job is
finished (or cancelled).
When the e-STUDIO automatically deletes expired user document data.
The general functions of the e-STUDIO enable a user to temporarily store user document data from the
scanner, LAN, Fax or USB line into the HDD of the e-STUDIO, and then to print, fax or save the data into
the e-Filing Box/shared holder. The user document data temporarily stored in the process are deleted by
the file delete function provided by OS, as soon as they are no longer needed.
In this case, the file area pointer of the FAT32 (File Allocation Table) managed by OS is only cleared, thus,
the area with the user document data recorded, which, the e-STUDIO user may never think, is present in the
HDD, still remains in the e-STUDIO. In addition, previous data remain as residual magnetism even after
the deleted area is overwritten with new data. Therefore, an attacker with knowledge of OS and data
recovery tools may possibly remove the HDD and refer to the actual data with only the pointer reset, or read
the residual magnetism of the data and retrieve information, posing a huge threat. Similarly, when the data
in the e-Filing Box/shared folder are deleted, the data believed to have been deleted may be read, posing a
threat.
The Data Overwrite function as one of the security functions in normal mode of the TOE (1.4.2.2 Security
Functions in Normal Mode) permanently erases user document data to be deleted. The user does not
need any special operation to erase residual data, as long as the security functions are enabled.
In addition, Forcible Data Overwrite process as one of the security functions in self-diagnostic mode (1.4.2.4
Security Functions in Self-Diagnostic Mode), which collectively and permanently erases remaining data
saved in the e-Filing Box/shared folder when the HDD is disposed of or replaced, is provided.
LAN
PC Internet
Mail
server
PSTN
Fax
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1.3.3 Hardware, software and firmware other than required for TOE
The hardware identified below is required to operate the TOE:
y Identification of hardware and software depended by the security functions of the TOE
Hardware Configuration Specification (Copy/print speed on A4-size or letter-size paper)
e-STUDIO205L Monochrome: 20.3 sheets/min.
e-STUDIO255 Monochrome: 25.3 sheets/min.
e-STUDIO305 Monochrome: 30.3 sheets/min.
e-STUDIO355 Monochrome: 35.3 sheets/min.
e-STUDIO455 Monochrome: 45.3 sheets/min.
Software such as printer drivers, Fax drivers, web browsers and mailers is required for the PC to use the
functions in normal mode in Figure 1.3.2 Configuration. The following software is installed in the PC to test
the TOE:
y Printer driver
e-STUDIO455 Series Printer Driver Ver 5.15.83.0
y Fax driver
e-STUDIO Network-Fax Ver 5.15.83.0
y Brower
Internet Explorer Ver 6.0 SP2
y Mailer
AL-MaiL32 Version 1.13
y WIA Scan Driver-compliant application
Windows Fax and Scan Version 6.0
1.3.4 TOE-related Personnel
Personnel and IT equipment for operating the TOE are described below:
y Users
Users utilize the general functions of the e-STUDIO on the e-STUDIO.
y Administrators
Administrators configure each setting of the general functions of the TOE (including copy, network
and Fax settings) and request service engineers to operate the forcible Data Overwrite function on
the HDD.
Note administrators do not manage the security functions regarding this TOE.
y Service Engineers
Service engineers perform service maintenance operations such as installation of the e-STUDIO
(including security license registration with the GP1070 or GP-1140) in the operation of the e-
STUDIO.
Upon request from the administrator, the service engineer starts the TOE in self-diagnostic mode
and operates the forcible Data Overwrite function to collectively and permanently erase all HDD
areas, in order to delete user document data in the HDD of the e-STUDIO.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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1.3.5 Secured Assets
Secured assets in normal and self-diagnostic modes are described below:
y Secured assets in normal mode
The remaining magnetic data in the HDD after deletion of user document data indicate secured
assets.
Secured assets are generated in the following situations:
(1) When the e-STUDIO deletes user document data during a job specified by the user or after the
job is finished (or cancelled).
(2) When the e-STUDIO automatically deletes expired user document data.
y Secured assets when the HDD is disposed of or replaced
The remaining user document data in the HDD of the e-STUDIO to be disposed of or in the HDD to
be replaced indicate secured assets.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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1.4 TOE Description
1.4.1 TOE Physical Range
This product is a digital multifunction peripheral, which integrates the general functions of the e-STUDIO, in
other words, copy, scan, print, fax and e-Filing Box/shared folder functions.
Among the TOEs, OS is installed on the ROM and any other than OS is installed on the HDD.
When the power to the e-STUDIO is turned on, the e-STUDIO starts in normal mode. Users usually
operate the e-STUDIO in this mode.
In normal mode, the general functions of the e-STUDIO (1.4.2.1 General Functions of the e-STUDIO in
Normal Mode) and the security functions in normal mode (1.4.2.2 Security Functions in Normal Mode) are
available.
In addition to the normal mode, the self-diagnostic mode used for service engineers to perform maintenance
services is also provided. When the e-STUDIO starts in self-diagnostic mode, the general functions of the
e-STUDIO and the security functions in normal mode are not available.
In this mode, the security functions in self-diagnostic mode (1.4.2.4 Security Functions in Self-Diagnostic
Mode) are available.
1.4.1.1 Configuration in Normal Mode
The configuration after this product starts in normal mode is shown below:
Figure 1.4.1.1 shows the operable state of this product after the power is turned on and program data is
downloaded from the HDD.
User document data exist only in the work area of the HDD, the specified e-Filing Box and shared folder.
The entire system software shown in Figure 1.4.1.1 is the TOE of this ST in normal mode.
Figure 1.4.1.1 Product Configuration in Normal Mode TOE
Area to save secured assets
Printer
PSTN
(Fax)
Scanner
LAN Line
Control Panel
Display
USB
HDD
User document data in
the deleted file
UI Data (Language)
General Functions of the e-STUDIO
Data Overwrite functions
Data Overwrite process
Data Overwrite registration
process
Copying Scanning
Printing
Fax
transmission
Fax reception Processing for
e-Filing Box/
shared folder
Security effective display
OS
UI Data (Frame)
Memory
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Control Panel,
Display
Interface composed of the touch panel and operation buttons.
Used for copying, printing, scanning, Fax transmission and
processing for e-Filing Box/shared folder.
Scanner
Device to read originals.
LAN Line
By connecting to the network, used as a network printer, in
TopAccess and for scanning through the network.
Used for printing, scanning, Fax transmission and processing for e-
Filing Box/shared folder.
PSTN (Fax)
By connecting to the telephone line, used for Fax transmission and
reception.
Used for Fax reception.
USB
By connecting USB memory storing PDF files, enabling the files to
be printed on the control panel, as well as being used as a printer by
connecting to a PC with the USB cable.
Used for printing and Fax transmission.
Printer Device for printing.
HDD
Enabling user document data to be saved in the e-Filing Box or
shared folder according to the user's operation, as well as storing
program data, UI data (language) and setup data. By using the
general functions of the e-STUDIO, enabling user document data
input into the e-STUDIO to be temporarily written into the HDD.
Secured assets in normal mode indicate the remaining magnetic
data in the HDD after deletion of user document data.
UI Data (Frame)
Possessing screen configuration information on the panel and
TopAccess and controlling the display and screen transition of
buttons or messages. Refer to UI data (language) for the displayed
buttons or messages.
UI Data (Language)
Storing data corresponding to each language, referred by UI data
(frame). Storing buttons or messages in the same configuration
each language. Out of the TOE range.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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1.4.1.2 Configuration in Self-Diagnostic Mode
The configuration of this product in self-diagnostic mode is shown below:
Figure 1.4.1.2 shows the operable state of this product after the power is turned on and program data is
downloaded from the HDD.
The entire system software shown in Figure 1.4.1.2 is the TOE of this ST in self-diagnostic mode.
Control Panel,
Display
A service engineer starts the self-diagnostic mode on the control
panel. In this mode, the forcible Data Overwrite function is enabled
when the e-STUDIO is disposed of or the HDD is replaced, as well
as maintenance settings.
Used for the forcible Data Overwrite function.
USB Used for connecting the GP-1070 or GP-1140.
GP-1070/GP-1140
Device for security license registration. Operated by a service
engineer and to be removed after license registration.
HDD
User document data in the deleted file no longer exist because the
general functions of the e-STUDIO are not available in self-
diagnostic mode.
Secured assets in self-diagnostic mode indicate the remaining user
document data in the HDD of the e-STUDIO to be disposed of or in
the HDD to be replaced.
UI Data (Frame)
Same as in normal mode. However, TopAccess is not available in
self-diagnostic mode.
UI Data (Language) Same as in normal mode.
Figure 1.4.1.2 Product Configuration in Self-Diagnostic Mode TOE
Area to save secured assets
Control Panel
Display
GP-1070
GP-1140
USB
UI Data (Language)
HDD
Forcible Data Overwrite function
Security License Registration/
Deletion process
OS
Type settings for HDD Overwrite/Forcible
HDD Overwrite
Settings for Maintenance/Device Information Display
UI Data (Frame)
e-Filing Box/
shared folder
Memory
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1.4.2 Logical Range of TOE
The general functions of the e-STUDIO and security functions are described below:
1.4.2.1 General Functions of the e-STUDIO in Normal Mode
(1) Security effective display
Whether or not the security license is registered is checked.
When the COUNTER button is pressed on the control panel, the print count screen appears.
When the security functions are enabled, the icon indicating data overwrite and TOE version
[SYS V3.0] are shown.
(2) Copying
When the COPY button is selected on the control panel, the START button is pressed after
copy settings, allowing the e-STUDIO to start copying.
The e-STUDIO scans user document data from the scanner, writes them in the work area of
the HDD, and outputs the data in the work area from the printer.
In addition, the copy settings enable the data to be saved in the e-Filing Box or shared folder of
the HDD, while being output from the printer at the same time. The e-STUDIO saves the data
in the work area.
(3) Printing
This function enables the operation to start through LAN and USB lines and on the control
panel.
y Start through LAN and USB lines (the eSTUDIO used as a printer)
The e-STUDIO can be used a network printer on the LAN line or a local printer by
connecting to a PC with the USB cable.
When printing is performed on the connected PC, user document data are sent to the e-
STUDIO through LAN lines or USB cables, allowing the e-STUDIO to start printing.
The settings enable the user document data to be saved in the e-Filing Box.
y Start through LAN lines (TopAccess)
It is the method of using the e-STUDIO as a printer, enabling the data to be output from the
printer through operations in TopAccess or on the panel, instead of directly being output from
the printer.
In TopAccess, when the PRINT menu is open on the JOB tab, a user document desired to
print is selected from the list and the RELEASE button is pressed, allowing the e-STUDIO to
start printing.
y Start on the control panel
This function enables a document file in USB media connected to the e-STUDIO to be
printed. When the USB button is pressed after selecting the PRINT button on the control
panel, the START button is pressed after selecting a document desired to print, allowing the
e-STUDIO to start printing.
As described in Start through LAN lines (TopAccess), the print jobs that are not output from
the printer can be output from the printer through operations on the control panel or in
TopAccess by allowing the e-STUDIO to start printing. When one of the PRIVATE, HOLD,
PROOF and INVALID buttons is pressed after selecting the PRINT button on the control
panel, the START button is pressed after selecting a document desired to print, allowing the
e-STUDIO to start printing.
When these interfaces allow the e-STUDIO to start printing, the e-STUDIO writes user
document data in the work area of the HDD. The e-STUDIO outputs the data in the work
area from the printer. The e-STUDIO saves the user document data in the work area in the
e-Filing Box.
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(4) Scanning
This function enables the operation to start on the control panel and through LAN lines.
When the SCAN button is selected on the control panel, the START button is pressed after
scan settings, allowing the e-STUDIO to start scanning. The e-STUDIO scans user document
data from the scanner and writes them in the work area of the HDD. The e-STUDIO saves
the data in the work area in the e-Filing Box, shared folder or USB media, or sends them to the
specified destination by e-mail.
Start through LAN lines provides a WS Scan function allowing the e-STUDIO on the LAN to be
used as a scanner on a Windows Vista PC. The PC sends a scan request to the e-STUDIO,
allowing the e-STUDIO to start scanning. The e-STUDIO scans user document data from the
scanner and sends image data to the PC that sent a scan request.
(5) Fax transmission
This function enables the operation to start on the control panel and through LAN and USB
lines.
y Start on the control panel
When the FAX button is selected on the control panel, the START button is pressed after
Fax settings, allowing the e-STUDIO to start Faxing.
The e-STUDIO scans user document data from the scanner, writes them in the work area of
the HDD, and sends the data in the work area by Fax through PSTN (Fax) or by Internet Fax
through LAN lines.
y Start through LAN and USB lines
The e-STUDIO can be used a network printer on the LAN line or a local printer by
connecting to a PC with the USB cable.
The print settings enable user document data to be sent by Fax or Internet Fax when the
Network Fax driver is selected.
When receiving the user document data from the Network Fax driver, the e-STUDIO starts
Fax transmission. The e-STUDIO writes the received user document data in the work area
of the HDD, and sends the data in the work area by Fax through PSTN (Fax) or by Internet
Fax through LAN lines.
(6) Fax reception
When receiving Fax data through PSTN (Fax) or Internet Fax data through LAN lines, the e-
STUDIO starts Fax reception.
The e-STUDIO writes the received user document data in the work area of the HDD, and
outputs the data from the printer.
When data are to be saved, the e-STUDIO saves the received data in the specified e-Filing
Box or shared folder.
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(7) Processing for e-Filing Box/shared folder
When using user document data saved in the e-Filing Box and shared folder, the e-STUDIO
starts processing for e-Filing Box and shared folder.
This function enables the operation to start on the control panel, through LAN lines
(TopAccess) and according to the time.
y Start on the control panel
When the E-FILING button is selected on the control panel to print, edit or delete the user
document data saved in the Box or send the data by e-mail, the e-STUDIO starts this
function.
The e-STUDIO writes the user document data in the e-Filing Box in the work area of the
HDD, outputs the data from the printer, saves the edited user document data or sends them
by e-mail.
y Start through LAN lines (TopAccess)
On the TopAccess screen, when printing, editing or deleting the user document data saved
in the Box, sending the data by e-mail or archiving them or uploading their archives, the e-
STUDIO starts this function.
The e-STUDIO writes the user document data in the e-Filing Box in the work area of the
HDD, outputs the data from the printer, saves the edited user document data in the e-Filing
Box, sends them by e-mail or sends archives of the user document data to a PC
(TopAccess).
In addition, when uploading their archives from the PC (TopAccess), the e-STUDIO writes
the received user document data in the work area of the HDD, and saves the data in the e-
Filing Box.
y Start according to the time
This function enables expired user data files saved in the e-Filing Box or shared folder to be
deleted.
1.4.2.2 Security Function (Data Overwrite Function) in Normal Mode
There are two security functions in normal mode: Data Overwrite registration process and Data Overwrite
process. These two functions are collectively called the Data Overwrite functions.
y Data Overwrite registration process
Data Overwrite registration process starts when user document data are deleted in processing of (2)
to (7) in 1.4.2.1 General Functions of the e-STUDIO in Normal Mode.
This function overwrites registers the user document data with a deletion request (registers only its
path). This function makes the deleted files targeted for Data Overwrite process.
y Data Overwrite process
This function monitors the storage area of user document data to start and be deleted by Data
Overwrite process after the power to the e-STUDIO is turned on, and permanently erases the area.
While the user document data are being permanently erased, "ERASING DATA" appears on the
control panel.
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1.4.2.3 Settings for Maintenance/Device Information Display in Self-Diagnostic Mode
A service engineers starts and uses the self-diagnostic mode.
The settings for maintenance and device information display are divided into eight types listed in Table
1.4.2.3 Types of Self-Diagnostic Mode and their starting methods vary.
Some items of the "Setting" type affecting the security are described in 1.4.2.4 Security Functions in Self-
Diagnostic Mode.
Type Overview
Control Panel Check Checks whether or not the panel LED lights up.
Tests Checks the input signal status of LAN and USB lines.
Test Print Prints a test pattern.
Adjustment Adjusts hardware.
Setting Set items.
List Print Prints a list of counters.
PM Support Resets counters.
Firmware Update Updates system firmware.
Table 1.4.2.3 Types of Self-Diagnostic Mode
1.4.2.4 Security Functions in Self-Diagnostic Mode
In the "Setting" type in Table 1.4.2.3 Types of Self-Diagnostic Mode, a code is entered to start the functions
after the e-STUDIO starts.
y Forcible Data Overwrite function
This function is implemented on the control panel when the e-STUDIO is disposed of or the HDD is
replaced.
When this function is implemented, the remaining user document data in the HDD are collectively
and permanently erased.
y Security License Registration/Deletion process
The GP-1070 or GP-1140 is used to register or delete the license.
When the security license is deleted, the e-STUDIO is unavailable. Installation of the TOE by the
service engineer is required to restore the e-STUDIO.
y Type settings for HDD Overwrite/Forcible HDD Overwrite
The overwrite types of Data Overwrite function in normal mode and forcible Data Overwrite in self-
diagnostic mode are set.
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1.4.3 Identification of Guidance Configuring the TOE
The guidance configuring the TOE is listed below:
Type
Identification
No.
Document Name Version Remarks
OMJ080001C0 Safetly Infromation
Japanese
Version
OME080002C
0
Safety Information
English
Version
*1
OMJ08017500
e-STUDIO255/355/455
Quick Start Guide
Japanese
Version
Operator's
Manual
OME08017600
e-STUDIO205L/255/305/355/455
Quick Start Guide
English
Version
*2
SMJ09000200
e-STUDIO255/355/455
Service Manual
Japanese
Version
SME09000100
e-STUDIO205L/255/305
e-STUDIO355/455
SERVICE MANUAL
English
Version
SHJ09000200
e-STUDIO255/355/455
Service Handbook
Japanese
Version
Service
Manual
SHE09000100
e-STUDIO205L/255/305
e-STUDIO355/455
SERVICE HANDBOOK
English
Version
*3
*1 Request information to safely use this product
*2 Information on preparation for using this product and its basic usage
*3 Manual containing information required to maintain hardware/software for this product
Note: Only the guidance of the English version is to be evaluated because the e-STUDIO205L and e-
STUDIO305 will not be marketed for Japan.
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2. CONFORMANCE CLAIMS
This chapter describes reference to ST, reference to TOE and conformance to the CC.
2.1 Conformance Claims to the CC
Conformance to the CC that this ST and the TOE claim is described below:
CC Versions to which the ST and TOE claim conformance:
Part 1: Introduction and General Models, Version 3.1 Translated Version 1.2, March 2007
Part 2: Security Function Components, Version 3.1 Translated Version 2.0, March 2008
Part 3: Security Assurance Components, Version 3.1 Translated Version 2.0, March 2008
Conformance of ST to CC Version Part 2: Conformance to CC Version Part 2
Conformance of ST to CC Version Part 3: Conformance to CC Version Part 3
2.2 Protection Profile (PP) Claims, Package Claims
This ST conforms to the following evaluation assurance level and PP:
y The evaluation assurance level conforms to EAL3.
y There are no PPs to which this ST conforms.
2.3 Conformance Rationale
N/A.
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3. SECURITY PROBLEM DEFINITION
This chapter defines security issues to be handled by the TOE and in its operating environment.
3.1 Threats
The details of potential attackers' threats against the e-STUDIO are described below:
y T.TEMPDATA_ACCESS
A malicious user or unrelated user may attempt to retrieve user documents while surreptitiously
removing the HDD from the e-STUDIO, restoring and decoding user document data deleted from the
HDD of the e-STUDIO, using existing tools.
y T.STOREDATA_ACCESS
A malicious user or unrelated user may attempt to retrieve user documents from the HDD disposed
of or replaced of the e-STUDIO, using existing tools.
3.2 Organizational Security Policies
There are no organizational security policies for the TOE.
3.3 Assumptions
The assumptions for the TOE are described below:
y A.TRUST_SE
It is assumed that the service engineer has knowledge required to operate the e-STUDIO in self-
diagnostic mode and does not perform invalid operations.
y A.NO_ERASE_STOP
It is not assumed that Data Overwrite process in normal mode is stopped due to power shutdown.
y A.SECURITY_ENABLED
It is assumed that the e-STUDIO user and administrator use the TOE by making sure the security
functions are running.
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4. SECURITY OBJECTIVES
This chapter describes the security objectives for the TOE and its environment.
4.1 Security Objectives for the TOE
The security objectives for the TOE are described below:
y O.TEMPDATA_OVERWRITE
The TOE needs to permanently erase user document data to be deleted from the HDD of the e-
STUDIO, and delete the data in order to prevent them from being restored or decoded.
y O.STOREDATA_OVERWRITE
The TOE needs to provide the capability to permanently erase all user document data in the HDD to
be disposed of or replaced.
4.2 Security Objectives for the Operating Environment
The security objectives for the operating environment are described below:
y OE.HDD_ERASE
The administrator requests the service engineer to dispose of or replace the e-STUDIO. The
service engineer needs to permanently erase the HDD in order to prevent all user document data
from being restored or decoded, when disposing of or replacing the e-STUDIO.
y OE.TRUST_SE
The administrator needs to have the service engineer certified by Toshiba TEC Corporation operate
the e-STUDIO in self-diagnostic mode. Toshiba TEC Corporation needs to have knowledge
required by the service engineer, and ensures the service engineer does not perform invalid
operations.
y OE.NO_ERASE_STOP
The e-STUDIO user and administrator are not allowed to turn off the power to the e-STUDIO while
"ERASING DATA" is displayed on the control panel in normal mode.
y OE.SECURITY_ENABLED
The e-STUDIO user and administrator needs to make sure the security functions are running, on the
control panel. When the security functions are not performed, they are not allowed to use the TOE.
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Security Objectives Rationale
The table below shows the mapping of security objectives to assumptions and threats, and demonstrates
every security objective for the TOE corresponds to at least one of the assumptions and threats.
O.TEMPDATA_OVERWRITE
O.STOREDATA_OVERWRITE
OE.HDD_ERASE
OE.TRUST_SE
OE.NO_ERASE_STOP
OE.SECURITY_ENABLED
T.TEMPDATA_ACCESS 9
T.STOREDATA_ACCESS 9 9
A.TRUST_SE 9
A.NO_ERASE_STOP 9
A.SECURITY_ENABLED 9
This section describes sufficiency of security objectives against the TOE security environment (assumptions,
organizational security objectives and threats).
y T.TEMPDATA_ACCESS
O.TEMPDATA_OVERWRITE can counter threats, which may restore and decode the remaining
magnetic data in the HDD, because user document data in the file deleted from the HDD of the e-
STUDIO are permanently erased.
y T.STOREDATA_ACCESS
O.STOREDATA_OVERWRITE can counter threats by preventing all user document data from
being restored and decoded, because the forcible Data Overwrite function provides the capability
to permanently erase the area of the user document data from the HDD of the e-STUDIO,
OE.HDD_ERASE allows the administrator to request the service engineer to dispose of or replace
the e-STUDIO, and the requested service engineer permanently erases the HDD.
y A.TRUST_SE
OE.TRUST_SE satisfies the assumptions because Toshiba TEC Corporation ensures the certified
service engineer has knowledge required to operate the e-STUDIO and does not perform invalid
operations, and the administrator has the service engineer operate the e-STUDIO in self-diagnostic
mode.
y A.NO_ERASE_STOP
OE.NO_ERASE_STOP can satisfy the assumptions because the e-STUDIO user and administrator
are not allowed to turn off the power while "ERASING DATA" is displayed on the control panel in
normal mode, thus, Data Overwrite process is not stopped due to power shutdown.
y A.SECURITY_ENABLED
OE.SECURITY_ENABLED can satisfy the assumptions because the e-STUDIO user and
administrator do not use the TOE while the running security functions are not displayed on the
control panel.
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5. EXTENDED COMPONENTS DEFINITION
There are no extension components.
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6. SECURITY REQUIREMENTS
This chapter describes the security requirements for the TOE.
6.1 TOE Security Functional Requirements
y FDP_RIP.1_TEMP Subset residual information protection_TEMP
Hierarchical to: No other components
Dependencies: No dependencies
FDP_RIP.1_TEMP.1 The TSF shall ensure that any previous information content of a resource
is made unavailable upon the [selection: allocation of the resource to,
deallocation of the resource from] the following objects: [assignment: list
of objects].
List of objects
1. The area to store the remaining user document data in the HDD when
user documents are deleted during a job or when a job is finished
2. The area to store expired user document data saved in the e-Filing
Box or shared folder to be deleted
y FDP_RIP.1_ALL Subset residual information protection_ALL
Hierarchical to: No other components
Dependencies: No dependencies
FDP_RIP.1_ALL.1 The TSF shall ensure that any previous information content of a resource
is made unavailable upon the [selection: allocation of the resource to,
deallocation of the resource from] the following objects: [assignment: list
of objects].
List of objects
All existing user document data files in the HDD
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6.2 TOE Security Assurance Requirements
The evaluation assurance level for the TOE is EAL3. The TOE security assurance requirement
components are described below:
y Security Target evaluation
y ASE_CCL.1 Conformance claims
y ASE_ECD.1 Extended components definition
y ASE_INT.1 ST introduction
y ASE_OBJ.2 Security objectives
y ASE_REQ.2 Derived security requirements
y ASE_SPD.1 Security problem definition
y ASE_TSS.1 TOE summary specification
y Development
y ADV_ARC.1 Security architecture description
y ADV_FSP.3 Functional specification with complete summary
y ADV_TDS.2 Architectural design
y Guidance documents
y AGD_OPE.1 Operational user guidance
y AGD_PRE.1 Preparative procedures
y Life-cycle support
y ALC_CMC.3 Authorisation controls
y ALC_CMS.3 Implementation representation CM coverage
y ALC_DEL.1 Delivery procedures
y ALC_DVS.1 Identification of security measures
y ALC_LCD.1 Developer defined life-cycle model
y Tests
y ATE_COV.2 Analysis of coverage
y ATE_DPT.1 Testing: basic design
y ATE_FUN.1 Functional testing
y ATE_IND.2 Independent testing - sample
y Vulnerability assessment
y AVA_VAN.2 Vulnerability analysis
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6.3 Security Requirements Rationale
6.3.1 Security Functional Requirement Rationale
The table below shows the mapping of TOE security functions to security functional requirements, and
demonstrates every TOE security function corresponds to at least one of the TOE security functional
requirements.
O.TEMPDATA_OVERWRITE
O.STOREDATA_OVERWRITE
FDP_RIP.1_TEMP 9
FDP_RIP.1_ALL 9
The security functional requirements rationale is described below:
y O.TEMPDATA_OVERWRITE
y FDP_RIP.1_TEMP (Subset residual information protection_TEMP)
FDP_RIP.1_TEMP (Subset residual information protection_TEMP) disables the TOE to use any
previous resource information when resources to delete files are deallocated, thus, TOE can
permanently the area of user document data in the files deleted from the HDD of the e-STUDIO
and O.TEMPDATA_OVERWRITE is satisfied.
y O.STOREDATA_OVERWRITE
y FDP_RIP.1_ALL (Subset residual information protection_ALL)
FDP_RIP.1_ALL (Subset residual information protection_ALL) permanently erases all user
document data (objects) by operating the forcible Data Overwrite function and disables the TOE
to use any previous resource information when the e-STUDIO is disposed of or the HDD is
replaced, thus, O.STOREDATA_OVERWRITE is satisfied.
6.3.2 Security Assurance Requirements Rationale
The TOE is used in general office environments. Therefore, the opportunities of attack are limited and low
attack capabilities of threat agents can be assumed regarding the TOE.
In order to counter the attacks by the threat agents, the coverage of security objectives, which must be
analyzed during the development of TOE (systematic analysis and test of design, and security assurance of
development environment), is to be evaluated.
Therefore, the appropriate evaluation assurance level for the TOE is EAL3.
©2009 TOSHIBA TEC CORPORATION All rights reserved
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7. TOE SUMMARY SPECIFICATION
This chapter describes the TOE summary specification.
7.1 Data Overwrite Function
The general functions of the e-STUDIO allow user document data temporarily generated and stored in the
work area or stored in the e-Filing Box/shared folder, to deallocate resources when these storage areas are
deleted.
y During a job started by the user or when it is finished
y The period to save data in the e-Filing Box or shared folder expires.
In this case, the TSF overwrites registers a path of the storage area, and uses the path erased and
registered in the process where Data overwrite registration is monitored and the method to prevent the
appropriate area from being reread out, to immediately overwrite and release the area. While data are
being overwritten, "ERASING DATA" appears on the control panel.
The security functions (data overwrite functions) of the TOE are comprised of Data Overwrite registration
process and Data Overwrite process.
Data Overwrite process overwrites 00, FF and random data in the storage area specified by the path and
then releases the area, to permanently erase the area. The TOE allows this erase type to be used but
more secure erase types to be selectable in self-diagnostic mode.
The Data Overwrite function can permanently erase the area of user document data and enables
FDP_RIP.1_TEMP by preventing the area from being restored and decoded.
7.2 Forcible Data Overwrite Function
The TSF operates the forcible Data Overwrite function to overwrite all HDD storage areas including existing
user document data files in the HDD with 00, FF and random data, and initialize the areas. This function
ensures to prevent all areas of user document data from being restored and decoded, and enables
FDP_RIP.1_ALL.