ISO/IEC 18033-3:2010
(Main)Information technology — Security techniques — Encryption algorithms — Part 3: Block ciphers
Information technology — Security techniques — Encryption algorithms — Part 3: Block ciphers
ISO/IEC 18033 specifies encryption systems (ciphers) for the purpose of data confidentiality. ISO/IEC 18033-3:2010 specifies block ciphers. A block cipher is a symmetric encipherment system with the property that the encryption algorithm operates on a block of plaintext, i.e. a string of bits of a defined length, to yield a block of ciphertext. ISO/IEC 18033-3:2010 specifies following algorithms: 64-bit block ciphers: TDEA, MISTY1, CAST-128, HIGHT; 128-bit block ciphers: AES, Camellia, SEED. NOTE The primary purpose of encryption (or encipherment) techniques is to protect the confidentiality of stored or transmitted data. An encryption algorithm is applied to data (often called plaintext or cleartext) to yield encrypted data (or ciphertext); this process is known as encryption. The encryption algorithm needs to be designed so that the ciphertext yields no information about the plaintext except, perhaps, its length. Associated with every encryption algorithm is a corresponding decryption algorithm, which transforms ciphertext back into its original plaintext.
Technologies de l'information — Techniques de sécurité — Algorithmes de chiffrement — Partie 3: Chiffrement par blocs
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Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 18033-3
Second edition
2010-12-15
Information technology — Security
techniques — Encryption algorithms —
Part 3:
Block ciphers
Technologies de l'information — Techniques de sécurité — Algorithmes
de chiffrement
Partie 3: Chiffrement par blocs
Reference number
©
ISO/IEC 2010
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ii © ISO/IEC 2010 – All rights reserved
Contents Page
Foreword . v
1 Scope . 1
2 Terms and definitions . 1
3 Symbols . 2
4 64-bit block ciphers . 3
4.1 Introduction . 3
4.2 TDEA . 3
4.2.1 The Triple Data Encryption Algorithm . 3
4.2.2 TDEA encryption/decryption . 3
4.2.3 TDEA keying options . 4
4.3 MISTY1 . 4
4.3.1 The MISTY1 algorithm . 4
4.3.2 MISTY1 encryption . 4
4.3.3 MISTY1 decryption . 5
4.3.4 MISTY1 functions . 5
4.3.5 MISTY1 key schedule . 10
4.4 CAST-128 . 11
4.4.1 The CAST-128 algorithm . 11
4.4.2 CAST-128 encryption . 11
4.4.3 CAST-128 decryption . 11
4.4.4 CAST-128 functions . 11
4.4.5 CAST-128 key schedule . 18
4.5 HIGHT. 20
4.5.1 The HIGHT algorithm . 20
4.5.2 HIGHT encryption . 21
4.5.3 HIGHT decryption . 22
4.5.4 HIGHT functions . 23
4.5.5 HIGHT key schedule . 23
5 128-bit block ciphers . 24
5.1 Introduction . 24
5.2 AES . 24
5.2.1 The AES algorithm . 24
5.2.2 AES encryption . 24
5.2.3 AES decryption . 25
5.2.4 AES transformations . 26
5.2.5 AES key schedule . 30
5.3 Camellia . 32
5.3.1 The Camellia algorithm . 32
5.3.2 Camellia encryption . 32
5.3.3 Camellia decryption . 34
5.3.4 Camellia functions . 37
5.3.5 Camellia key schedule . 43
5.4 SEED . 47
5.4.1 The SEED algorithm . 47
5.4.2 SEED encryption . 47
5.4.3 SEED decryption . 47
5.4.4 SEED functions . 48
5.4.5 SEED key schedule . 50
Annex A (normative) Description of DES . 52
© ISO/IEC 2010 — All rights reserved iii
A.1 Introduction . 52
A.2 DES encryption . 52
A.3 DES decryption . 52
A.4 DES functions . 52
A.4.1 Initial permutation IP . 52
-1
A.4.2 Inverse initial permutation IP . 54
A.4.3 Function f . 54
A.4.4 Expansion permutation E . 55
A.4.5 Permutation P . 55
A.4.6 S-Boxes . 56
A.5 DES key schedule . 57
Annex B (normative) Object identifiers . 60
Annex C (informative) Algebraic forms of MISTY1 and Camellia S-boxes . 62
C.1 Introduction . 62
C.2 MISTY1 S-boxes . 62
C.2.1 The S-boxes S and S . 62
7 9
C.2.2 MISTY1 S-box S . 62
C.2.3 MISTY1 S-box S . 62
C.3 Camellia S-boxes . 63
Annex D (informative) Test vectors . 64
D.1 Introduction . 64
D.2 TDEA test vectors . 64
D.2.1 TDEA encryption . 64
D.2.2 DES encryption and decryption . 65
D.3 MISTY1 test vectors . 66
D.4 CAST-128 test vectors . 67
D.5 HIGHT test vectors . 67
D.6 AES test vectors . 67
D.6.1 AES encryption . 67
D.6.2 Key expansion example . 68
D.6.3 Cipher example . 70
D.7 Camellia test vectors . 73
D.7.1 Introduction . 73
D.7.2 Camellia encryption .
...
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