By André Perez

Community defense

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2. AES algorithm The advanced encryption standard (AES) algorithm is a symmetrical block algorithm. It operates on 128-bit data blocks and uses keys 128 bits, 192 bits, or 256 bits in length. The 16-byte data input block is represented by a four-line by four-column table, with each cell containing a byte. Input data: 32 43 f6 a8 88 5a 30 8d 31 31 98 a2 e0 37 07 34 The 16-byte key is represented by a four-line by fourcolumn table, with each cell containing a byte. Introduction to Cryptography 7 Initial 128-bit key: 2b 7e 15 16 28 ae d2 a6 ab f7 15 88 09 cf 4f 3c An exclusive OR is executed between the input data and the initial key.

7 shows the e primary iteration of the SH HA-2 algorrithm. 7. Primaryy iteration of the t SHA-2 alg gorithm Th he operating princip ple pertain ning to eacch iteration n is identtical for all a of the algorithmss in the SHA-2 S fam mily. How wever, these e algorithm ms differ in the t followin ng ways: – the SHA-2 256 and SHA-224 S allgorithms use a spe ecific initia alization ve ector; 20 Network Security – the SHA-512, SHA-384 and SHA-512/256 algorithms use a specific initialization vector; – the SHA-256 and SHA-224 algorithms, on the one hand, and the SHA-512, SHA-384 and SHA-512/256 algorithms, on the other hand, use Boolean functions (Ch, Ma), rotation operations (Σ0, Σ1), and specific k[i] constants.

Filling is always executed, even if the message is already congruent to 448 bits modulo 512. The filling value therefore varies from 1 to 512 bits. Filling is executed as follows: – the final filling bit is set at one; – the other filling bits are set at zero. The length of the data block is coded on 64 bits. This field is added to the structure previously defined so as to obtain 512-bit data blocks. 14 Network Security Calculation of the digest is based on registers A, B, C and D, which are 32 bits in length.

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