AES (Advanced Encryption Standard) andTriple-DES (X.52)

DATES:

1. Submission deadline: candidate algorithm nomination packages must be received

by June 15, 1998.

2. Published date : April, 1999.

NIST Seeks Candidate Algorithms for Advanced Encryption Standard (AES)

AES

Block Cipher

Plaintext :128 bits

Ciphertext :128 bits

Key Length :128, 192, 256 bits

1. DES-EEE3: Three DES encryption with

three different keys.

2. DES-EDE3: Three DES operations in the

sequence encrypt-decrypt-encrypt with

three different keys.

3. DES-EEE2 and DES-EDE2: Same the

previous formats except that the first and

third operations use the same key.

Modes of triple-encryption :

E

E

D

D

D

E

E

D

E

E

D

D

D

E

E

D

NOTE : the use of multiple encryption does not provide the expected increase in security

政府憑證管理中心(GCA)

之技術規範:

1. Encryption :

Triple DES / CBC 112 bits

2. Digital Signature :

RSA with SHA-1 1024 bits

3. Key exchange :

RSA 1024 bits

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