VOCAL offers complete hardware design, firmware development, software and support. For more information regarding our products and services click here

JPSEC Authentication Template

The authentication template conveys to the verifier how to verify the authenticity of the recieved codestream. There are 3 general classes of authentication methods:

• Hash-Based Authentication
• Cipher-Based Authentication
• Digital Signatures

The first two are also referred to as Message Authentication Codes (MACs). The template defines the authentication method to be used and any parameters needed to accomplish the authentication.

When the Hash-based MAC is called for there is only one method defined in the JPSEC standard HMAC. The list of Hash functions for use with this method are given in table 1. The method, function, key template, and size in bits of the MAC are defined in the template.

Table 1: JPSEC Hash Function Identifiers

Identifier	Hash Function
0	Reserved
1	SHA-1
2	RIPEMD-128
3	RIPEMD-160
4	MASH-1
5	MASH-2
6	SHA-224
7	SHA-256
8	SHA-384
9	SHA-512
10	Whirlpool
	All other values are reserved for ISO use

When the Cipher-based MAC is called for there are four methods defined in the JPSEC standard:

• CBC-MAC MAC Algorithm 1
• CBC-MAC MAC Algorithm 2
• CBC-MAC MAC Algorithm 3
• CBC-MAC MAC Algorithm 4

The list of Block-ciphers for use with these methods is given in table 2. The method, block-cipher to be used, key template, and size in bits of the MAC are defined in the template.

Table 2: JPSEC Block-cipher Identifiers

Identifier	Cipher Type
0x0000	NULL (no encryption)
0x0001	AES
0x0002	TDEA
0x0003	MISTY-1
0x0004	Camellia
0x0005	CAST-128
0x0006	SEED
	All other values are reserved for ISO use

When a digital signature is called for there are four methods defined in the JPSEC standard:

• RSA
• Rabin
• DSA
• ECDSA

The list of Hash functions for use with this method are given in table 1. The method, hash function, key template, and size of the digital signature in bits are defined in the template.

Further information available here:
JPSEC
JPSEC Tools
JPSEC Tool Decryption Template
JPSEC Tool Hash Template
JPSEC Tool Key Template
JPSEC Registration Authority (RA)


JPSEC Standards available here:
Joint Photographic Experts Group (JPEG) Part 8 - JPSEC: Secure JPEG 2000 Final Committee Draft
ISO/IEC 15444-8:2007 - Information technology -- JPEG 2000 image coding system: Secure JPEG 2000
T.807 (05/06) - Information technology -- JPEG 2000 image coding system: Secure JPEG 2000