©NUVOTON TECHNOLOGY CORP. – NON-PROPRIETARY SECURITY POLICY – MAY BE RE-DISTRIBUTED FREELY IN ITS COMPLETE, UNEDITED FORM
NPCT6XX TPM 2.0
FIPS 140-2 SECURITY POLICY
DOCUMENT VERSION: 5.7
LAST REVISION: MAY 6, 2021
NUVOTON
TECHNOLOGY
CORPORATION
8 HASADNAOT STREET
HERZLIA, 46130
ISRAEL
NUVOTON TPM 2.0. SECURITY POLICY PAGE 2 OF 27
CONTENTS
1. Module Description................................................................................ 3
2. Cryptographic Functions ..................................................................... 8
3. Ports and Interfaces.............................................................................11
4. Roles and Services................................................................................13
5. Key Management...................................................................................18
6. Power-On Self Tests.............................................................................23
7. Conditional Self-Tests .........................................................................24
8. Crypto-Officer Guidance.....................................................................25
9. User Guidance ........................................................................................25
10. Acronyms ..............................................................................................26
LIST OF TABLES AND FIGURES
Figure 1: TPM 2.0 ImageS......................................................................... 4
Figure 2: TPM 2.0 Logical Block Diagram .......................................... 6
Table 1: Security Levels ............................................................................ 7
Table 2: Cryptographic Functions......................................................... 8
Table 3: Ports and Interfaces................................................................12
Table 4: Roles..............................................................................................13
Table 5: Services........................................................................................15
Table 6: Cryptographic Keys.................................................................18
Table 7: Self-Tests.....................................................................................23
NUVOTON TPM 2.0. SECURITY POLICY PAGE 3 OF 27
1. MODULE DESCRIPTION
The Nuvoton Trusted Platform Module (“MODULE”) is a
hardware cryptographic module that implements advanced
cryptographic algorithms, including symmetric and
asymmetric cryptography, as well as key generation and
random number generation.
The Module is a SINGLE-CHIP MODULE that provides cryptographic
services utilized by external applications. The Module meets
the requirements of FIPS Pub 140-2.
The Module meets commercial-grade specifications for power,
temperature, reliability, shock, and vibrations, and includes
chip packaging to meet the physical security requirements at
Security Level 2.
The Module has two silicon revisions: FB5C85D and FB5C85E.
The latter includes several issue fixes related to interface,
power management and versioning. The changes have no
impact on the security of the Module.
The FIPS 140-2 conformance testing was performed on the
following configurations of the Nuvoton NPCT6xx TPM 2.0:
 FIRMWARE VERSIONS: 1.3.0.1, 1.3.1.0, 1.3.2.8
 HARDWARE VERSION 1: FB5C85D IN TSSOP28 PACKAGE
 HARDWARE VERSION 2: FB5C85D IN QFN32 PACKAGE
 HARDWARE VERSION 3: FB5C85E IN TSSOP28 PACKAGE
 HARDWARE VERSION 4: FB5C85E IN QFN32 PACKAGE
NUVOTON TPM 2.0. SECURITY POLICY PAGE 4 OF 27
Images depicting the Module are shown in Figure 1:
FIGURE 1: TPM 2.0 IMAGES
FB5C85D IN TSSOP28 PACKAGE
FB5C85D IN QFN32 PACKAGE
NUVOTON TPM 2.0. SECURITY POLICY PAGE 5 OF 27
FB5C85E IN TSSOP28 PACKAGE
FB5C85E IN QFN32 PACKAGE
The PHYSICAL CRYPTOGRAPHIC BOUNDARY of the Module is the outer
boundary of the chip packaging.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 6 OF 27
A LOGICAL DIAGRAM of the Module is shown in Figure 2:
FIGURE 2: TPM 2.0 LOGICAL BLOCK DIAGRAM
The Module was tested to meet OVERALL SECURITY LEVEL 2 of the
FIPS PUB 140-2 standard. The Security Level for each section
of FIPS PUB 140-2 is specified in Table 1.
RNG POWER
MANAGEMENT
NON-VOLATILE
DATA
PROCESSOR
CRYPTO
ACCELE-
RATOR
CODE
GPIO
PERIPHE-
RALS
VOLATILE
DATA
HOST
INTERFACE
(TIS
EMULATION)
LPC\I2
C\
SPI BUS
GPI0
NUVOTON TPM 2.0. SECURITY POLICY PAGE 7 OF 27
TABLE 1: SECURITY LEVELS
FIPS 140-2 SECTION SECURITY LEVEL
CRYPTOGRAPHIC MODULE SPECIFICATION 2
CRYPTOGRAPHIC MODULE PORTS AND
INTERFACES
2
ROLES, SERVICES AND AUTHENTICATION 2
FINITE STATE MODEL 2
PHYSICAL SECURITY 2
OPERATING ENVIRONMENT N/A
CRYPTOGRAPHIC KEY MANAGEMENT 2
EMI/EMC 2
SELF-TESTS 2
DESIGN ASSURANCE 2
MITIGATION OF OTHER ATTACKS N/A
NUVOTON TPM 2.0. SECURITY POLICY PAGE 8 OF 27
2. CRYPTOGRAPHIC FUNCTIONS
The Module’s cryptographic functions are outlined in Table 2.
TABLE 2: CRYPTOGRAPHIC FUNCTIONS
FUNCTION
KEYSIZE
USE
CERT
NUMBER
APPROVED FUNCTIONS
AES MODES: ECB
(ENCRYPT), OFB
(ENCRYPT/DECRYPT),
CFB128(ENCRYPT/DECRYP
T), CTR (ENCRYPT)
128 BITS ENCRYPTION
AND
DECRYPTION
3541
3542
RSA SIGNATURE
GENERATION
AND VERIFICATION USING
RSASSA-PKCS1-V1_5 AND
RSASSA-PSS MODES AND
SHA-1/SHA-256
1024 &
2048
BITS
DIGITAL
SIGNATURE
VERIFICATION
1819
1820
ECDSA SIGNATURE
GENERATION AND
VERIFICATION USING P-256
CURVE AND SHA-1/SHA-
256
256 BITS DIGITAL
SIGNATURES
719
720
NUVOTON TPM 2.0. SECURITY POLICY PAGE 9 OF 27
HMAC KEYED HASH USING
SHA-1 AND SHA-256
160 BITS,
256 BITS
KEYED
MESSAGE
DIGEST
2262
2263
SHS HASH USING SHA-1
AND SHA-256
160 BITS,
256 BITS
MESSAGE
DIGEST
2919
2920
GENERATION OF RSA KEYS
FIPS 186-4
2048
BITS
KEY PAIR
GENERATION
1819
1820
GENERATION OF ECDSA
KEYS
FIPS 186-4
ECC KEY AGREEMENT
USING P-256 CURVE AND
SHA-256
SP 800-90A DRBG
256 BITS
256 BITS
N/A
KEY PAIR
GENERATION
KEY
AGREEMENT
RANDOM
NUMBER
GENERATION
& SYMMETRIC
KEY
GENERATION
719
720
66
67
898
899
APPROVED SERVICES
CVL
SP 800-135 REV1
N/A TPM KEY
DERIVATION
594
596
CVL
SP 800-56A REV. 3 USING
P-256 CURVE
N/A TPM KEY
DERIVATION
VENDOR
AFFIRMED
ALLOWED FOR USE FUNCTIONS
RSA KEY WRAPPING 2048
BITS
WRAP & N/A
NUVOTON TPM 2.0. SECURITY POLICY PAGE 10 OF 27
UNWRAP
SYMMETRIC
KEYS
NDRNG (ENTROPY
SOURCE).
N/A GENERATE
THE SEED
INPUT FOR
THE DRBG
N/A
In the Approved mode of operation, the Module supports a key
size of 2048 bits for RSA key wrapping. This is equivalent to a
key strength of 112 bits. AES key wrapping functionality is
compliant with SP 800-38F Recommendation for Block Cipher
Modes of Operation: Methods for Key Wrapping since it uses
an Approved symmetric encryption algorithm (AES #3541 and
#3542) with an Approved authentication technique (HMAC
#2262 and #2263). This is designated as KTS (AES Certs.
#3541 and #3542 and HMAC Certs. #2262 and #2263) on the
certificate.
Note: Neither the TLS protocol nor the TPM protocol were
tested by the CAVP or CMVP.
2.1 Non-Approved, Allowed Function
The module supports the following Non-Approved but Allowed
functions, as listed in Table 2:
 RSA Key Wrapping; key size is 2048 bits
 NDRNG (proprietary Non-Deterministic Hardware
RNG); available entropy is 256 bits
2.2 Non-Approved, Non-Allowed Function
The Module supports signature generation using RSA-SHA-1.
This function is Non-Approved and is considered equivalent to
plaintext or obfuscation.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 11 OF 27
3. PORTS AND INTERFACES
The physical ports of the Module are
 LPC Bus
 SPI Bus
 I2C Bus
 GPIO Bus
The logical interfaces and the mapping of the logical interfaces
to the physical ports of the Module are described in Table 3.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 12 OF 27
TABLE 3: PORTS AND INTERFACES
LOGICAL
INTERFACE
DESCRIPTION PHYSICAL
PORTS
CONTROL INPUT
INTERFACE
CONTROL INPUT
COMMANDS ISSUED TO THE
CHIP
LPC BUS
SPI BUS
I2C BUS
GPIO BUS
STATUS OUTPUT
INTERFACE
STATUS DATA OUTPUT BY
THE CHIP
LPC BUS
SPI BUS
I2C BUS
GPIO BUS
DATA INPUT
INTERFACE
DATA PROVIDED TO THE
CHIP AS PART OF THE DATA
PROCESSING COMMANDS
LPC BUS
SPI BUS
I2C BUS
GPIO BUS
DATA OUTPUT
INTERFACE
DATA OUTPUT BY THE CHIP
A PART OF THE DATA
PROCESSING COMMANDS
LPC BUS
SPI BUS
I2C BUS
GPIO BUS
POWER
INTERFACE
POWER INTERFACE OF THE
CHIP
POWER PIN
GROUND PIN
The Module does not include a maintenance interface.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 13 OF 27
4. ROLES AND SERVICES
The OPERATOR ROLES implemented by the Module are
summarized in Table 4.
TABLE 4: ROLES
ROLE HIGH LEVEL DESCRIPTION
CRYPTO OFFICER INSTALLS AND CONFIGURES THE
PRODUCT, EXECUTES CRYPTO
ALGORITHMS AND GENERATES
KEYS
USER EXECUTES CRYPTO ALGORITHMS
AND GENERATES KEYS
The Module provides the set of SERVICES described in Table 5.
For each service, the table includes a description of the service
and lists the roles for which the service is available.
The Module implements authentication to authenticate
operator actions using authentication tokens. The
authentication token length is 32 bytes. Therefore, the total
number of authentication token combinations is 2^256 =
10^77, which meets the authentication strength requirements
of FIPS 140-2.
The maximum number of authentication attempts before
lockout is 10. The recovery time is 7,200 seconds (2 hours),
and the lockout recovery time is 86,400 seconds (24 hours).
Since only 10 tries are allowed, the probability of a successful
random attempt during a one minute period is 10 / 2^256,
which is less than one in 100,000.
The Module stores all authentication results in volatile
memory, which is cleared when the Module is powered off.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 14 OF 27
The Module always encrypts cryptographic key on key input
and output, which meets the key encryption requirements of
FIPS 140-2 and Security Level 2.
The Module provides SP 800-90A DRBG random bit generation
services without authentication, as permitted by FIPS 140-2
Implementation Guidance.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 15 OF 27
TABLE 5: SERVICES
SERVICE DESCRIPTION ROLE
GET STATUS THE MODULE IMPLEMENTS A GET
STATUS COMMAND THAT RETURNS THE
STATUS OF THE MODULE, INCLUDING
SUCCESS OR FAILURE OF SELF-TESTS.
NOTE: THIS SERVICE DOES NOT
REQUIRE AUTHENTICATION
CRYPTO
OFFICER
USER
RUN SELF-TESTS THE MODULE RUNS POWER-UP SELF-
TESTS AUTOMATICALLY WHEN
POWERED ON.
ONE CAN EXECUTE SELF-TESTS ON
DEMAND BY POWER-CYCLING THE
MODULE.
CRYPTO
OFFICER
USER
ENCRYPT USED TO ENCRYPT DATA CRYPTO
OFFICER
USER
DECRYPT USED TO DECRYPT DATA CRYPTO
OFFICER
USER
ZEROIZE USED TO ZEROIZE (IRREVERSIBLY
DESTROY) MODULE'S CRYPTOGRAPHIC
KEYS AND CSPS.
THE KEYS AND CSPS STORED IN THE
NON-VOLATILE AND VOLATILE MEMORY
ARE ZEROIZED BY EXECUTING THE
CORRESPONDING KEY/ENTITY
ZEROIZATION COMMANDS:
1. TPM2_FLUSHCONTEXT
2. TPM2_CLEAR
CRYPTO
OFFICER
USER
NUVOTON TPM 2.0. SECURITY POLICY PAGE 16 OF 27
MAC &
MAC VERIFY
USED TO CALCULATE AND VERIFY MAC
FOR DATA
CRYPTO
OFFICER
USER
KEY GENERATE USED TO GENERATE KEYS CRYPTO
OFFICER
USER
RSA VERIFY USED TO VERIFY DATA USING RSA CRYPTO
OFFICER
USER
ECDSA VERIFY USED TO VERIFY DATA USING ECDSA CRYPTO
OFFICER
USER
ECDSA SIGN USED TO SIGN DATA USING ECDSA CRYPTO
OFFICER
USER
RSA WRAPPING &
UNWRAPPING
USED TO WRAP & UNWRAP
CRYPTOGRAPHIC KEYS USING RSA
CRYPTO
OFFICER
USER
KEY IMPORT USED TO IMPORT KEYS CRYPTO
OFFICER
USER
KEY AGREEMENT USED TO DERIVE A KEY CRYPTO
OFFICER
USER
TPM IDENTITY USED TO
AUTHENTICATE TPM IDENTITY TO
OTHER PARTIES
CRYPTO
OFFICER
USER
TPM ENDORSEMENT USED TO PROVE TO OTHER PARTIES
THAT TPM IS A GENUINE TPM
CRYPTO
OFFICER
USER
NUVOTON TPM 2.0. SECURITY POLICY PAGE 17 OF 27
TPM GET RANDOM USED TO GENERATE RANDOM DATA
NOTE: THIS SERVICE DOES NOT
REQUIRE AUTHENTICATION
CRYPTO
OFFICER
USER
TPM STIR RANDOM USED TO ADD ENTROPY TO THE
RANDOM BIT GENERATOR
CRYPTO
OFFICER
USER
INSTALL MODULE INSTALLS MODULE CRYPTO
OFFICER
FIRMWARE UPDATE UPDATES MODULE’S FIRMWARE CRYPTO
OFFICER
USER
NUVOTON TPM 2.0. SECURITY POLICY PAGE 18 OF 27
5. KEY MANAGEMENT
Table 6 specifies each cryptographic key utilized by the
Module. For each key, the table provides a description of its
use; derivation or import; and storage.
NOTE: READ is defined as read access; WRITE is defined as write
access.
TABLE 6: CRYPTOGRAPHIC KEYS
KEY OR CSP USAGE SERVICE &
ACCESS
ORIGIN &
STORAGE
AES
SYMMETRIC
ENCRYPTION
KEYS
USED TO ENCRYPT
AND DECRYPT
DATA
ENCRYPT
READ
DECRYPT
READ
KEY GEN
WRITE
KEY WRAPPING
/UNWRAPPING
WRITE
KEY IMPORT
WRITE
ZEROIZE
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
OTP OR IN
NON-VOLATILE
FLASH IN
PLAINTEXT
NUVOTON TPM 2.0. SECURITY POLICY PAGE 19 OF 27
RSA AND
ECDSA PUBLIC
VERIFICATION
KEYS
USED TO VERIFY
SIGNATURES ON
DATA
RSA VERIFY
READ
KEY GEN
WRITE
ZEROIZE
WRITE
KEY WRAPPING
/UNWRAPPING
WRITE
KEY IMPORT
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
VOLATILE RAM
OR IN NON-
VOLATILE
FLASH IN
PLAINTEXT
RSA PUBLIC
STORAGE KEYS
USED TO WRAP
SYMMETRIC KEYS
RSA
WRAP/UNWRAP
READ
KEY IMPORT
WRITE
RSA KEY GEN
WRITE
ZEROIZE
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
VOLATILE RAM
OR IN NON-
VOLATILE
FLASH IN
PLAINTEXT
NUVOTON TPM 2.0. SECURITY POLICY PAGE 20 OF 27
RSA PRIVATE
STORAGE KEYS
USED TO UNWRAP
SYMMETRIC KEYS
RSA
WRAP/UNWRAP
READ
RSA KEY GEN
WRITE
KEY IMPORT
WRITE
ZEROIZE
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
VOLATILE RAM
OR IN NON-
VOLATILE
FLASH IN
PLAINTEXT
IDENTITY KEYS AUTHENTICATION
TOKENS USED TO
PROVE TPM
IDENTITY TO
OTHER PARTIES
TPM IDENTITY
READ
RSA KEY GEN
WRITE
KEY IMPORT
WRITE
ZEROIZE
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
VOLATILE RAM
OR IN NON-
VOLATILE
FLASH IN
PLAINTEXT
RSA PRIVATE
BINDING KEYS
USED TO UNBIND
(UNWRAP) A KEY
BOUND BY AN
EXTERNAL ENTITY
DATA BINDING
READ
RSA KEY GEN
WRITE
ZEROIZE
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
VOLATILE RAM
OR IN NON-
VOLATILE
FLASH IN
PLAINTEXT
NUVOTON TPM 2.0. SECURITY POLICY PAGE 21 OF 27
HMAC KEYS USED TO
CALCULATE AND
VERIFY MAC
CODES FOR DATA
MAC/MAC
VERIFY
READ
KEY GEN
READ
KEY IMPORT
WRITE
ZEROIZE
WRITE
GENERATED
OR IMPORTED
BY THE
MODULE,
STORED IN
VOLATILE RAM
OR IN NON-
VOLATILE
FLASH IN
PLAINTEXT
DRBG SEEDS USED TO SEED THE
DRBG
KEY GEN
READ
RSA KEY GEN
READ
ZEROIZE
WRITE
GENERATED BY
THE MODULE
USING THE
NON-
APPROVED
NON-
DETERMINISTIC
HARDWARE
RNG
(ENTROPY
SOURCE)
STORED IN
VOLATILE RAM
IN PLAINTEXT
ENDORSEMENT
KEYS
AUTHENTICATION
TOKENS USED TO
PROVE TO THE
EXTERNAL PARTIES
THAT TPM IS A
GENUINE TPM
TPM
ENDORSEMENT
READ
GENERATED BY
THE MODULE
NUVOTON TPM 2.0. SECURITY POLICY PAGE 22 OF 27
PLATFORM
KEYS
KEYS USED BY THE
PLATFORM
FIRMWARE
RSA KEY GEN
WRITE
ECDSA KEY GEN
WRITE
GENERATED BY
THE MODULE
HMAC
AUTHENTICATI
ON KEY
USED FOR HMAC
AUTHENTICATION
OF DATA
KEY GENERATE
WRITE
MAC/MAC
VERIFY
READ
GENERATED BY
THE MODULE
FIRMWARE
UPDATE KEY
USED TO VERIFY
SIGNATURE ON
FIRMWARE
UPDATES
FIRMWARE
UPDATE
READ
INSTALLED AT
THE FACTORY
NUVOTON TPM 2.0. SECURITY POLICY PAGE 23 OF 27
6. POWER-ON SELF TESTS
The Module implements a power-up integrity check using a
256-bit error detection code.
The Module implements power-up cryptographic algorithm
tests that are described in Table 7.
TABLE 7: SELF-TESTS
CRYPTO FUNCTION TEST TYPE
AES CTR ENCRYPT (ALL MODES)
AND DECRYPT (ALL MODES)
KNOWN ANSWER TEST
(ENCRYPT AND DECRYPT)
RSA VERIFY
ECDSA SIGN/VERIFY
ECC KEY AGREEMENT
KNOWN ANSWER TEST (VERIFY)
PAIR-WISE CONSISTENCY TEST
PAIR-WISE CONSISTENCY TEST
HMAC KEYED HASH KNOWN ANSWER TEST
(KEYED HASH)
SHS HASH KNOWN ANSWER TEST (HASH)
DRBG RANDOM NUMBER
GENERATION
KNOWN ANSWER TEST
(GENERATE RANDOM BLOCK)
NUVOTON TPM 2.0. SECURITY POLICY PAGE 24 OF 27
7. CONDITIONAL SELF-TESTS
The Module executes the following tests and checks:
 Continuous DRBG test on each execution of the SP 800-
90A DRBG (both the entropy source and the approved
algorithm are tested).
 Conditional pair-wise consistency check for RSA public-
private key pairs each time an RSA key pair is
generated, using FIPS 186-4 key pair generation
algorithm.
 Conditional pair-wise consistency check for ECDSA
public-private key pairs each time an ECDSA key pair is
generated, using FIPS 186-4 key pair generation
algorithm.
 Firmware update test during the firmware update. The
digital signature is verified on the firmware image using
an RSA (SHA-256) algorithm, utilizing a 2048-bit
firmware update key.
If any of the conditional or power-on self-tests fail, the Module
enters an error state where both data output and
cryptographic services are disabled.
In addition, the Module executes DRBG Instantiate, DRBG
Generation, DRBG reseed, and DRBG Instantiate tests, as
prescribed by SP 800-90A.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 25 OF 27
8. CRYPTO-OFFICER GUIDANCE
To install the Module in the Approved Mode of operation, the
following steps must be followed:
 The Module must be physically controlled during the
installation.
 The Module must be placed on the PCB as described in
the Module technical specifications.
 The Module arrives from the manufacturer, typically pre-
configured with FIPS mode enabled according to the
NPCT65x TPM2.0 Programmer’s Guide (CFG_H[0] is
zero). If the initialization sequence was not executed by the
manufacturer, the Crypto Officer must initialize the Module
using the NTC2_PreConfig command (see Section 3.1 in
the NPCT65x TPM2.0 Programmer’s Guide).
9. USER GUIDANCE
The user shall take security measures to protect the tokens
used to authenticate the user to the Module.
NUVOTON TPM 2.0. SECURITY POLICY PAGE 26 OF 27
10. ACRONYMS
AES Advanced Encryption Algorithm
CPU Central Processing Unit
ECC Elliptic Curve Cryptography
EMC Electro-Magnetic Compatibility
EMI Electro-Magnetic Interference
FIPS Federal Information Processing Standard
GPIO General-Purpose Input Output bus
HMAC Hash-based Message Authentication Code
I2C Inter-Integrated Circuit bus
LPC Low Pin Count bus
OTP One-Time Programmable Memory
PCB Printed Circuit Board
RAM Random Access Memory
DRBG Deterministic Random Bit Generator
RSA Rivest-Shamir-Adleman
SHS Secure Hash Standard
SP Special Publication
SPI Serial Peripheral Interface bus
TCG Trusted Computing Group
TIS TPM Interface Specification
TPM Trusted Platform Module
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