By André Perez
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Extra resources for Network Security
The first stage consists of filling the data block. The data block is completed so as to be congruent to 448 bits modulo 512. 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.
Algorithm SHA-0 is inspired by the MD5 algorithm. It is not recommended for using for security questions. Algorithm SHA-1 is a modified version of algorithm SHA-0. Algorithm SHA-2 is composed of two algorithms: – algorithm SHA-256, including versions SHA-224 and SHA-256; – algorithm SHA-512, including versions SHA-384, SHA512, SHA-512/256, and SHA-512/224. 1. SHA-1 algorithm Th he function ning of the SHA-1 alg gorithm is similar s to that t of th he MD5 allgorithm, for f which the t princip pal differen nces introoduced are:: – there are 5 registers (A, B, C, D and E) used to prod duce the 160-bit 1 dige est; – the numbe er of primarry iteration ns increasess to 80.
1. SHA-1 algorithm Th he function ning of the SHA-1 alg gorithm is similar s to that t of th he MD5 allgorithm, for f which the t princip pal differen nces introoduced are:: – there are 5 registers (A, B, C, D and E) used to prod duce the 160-bit 1 dige est; – the numbe er of primarry iteration ns increasess to 80. 6 shows the e primary iteration of the SH HA-1 algorrithm. Th he SHA-1 algorithm uses a Bo oolean funcction F am mong four and chang ges function n every 20 iterations.. Likewise, the value of k[i] rem mains constant for 20 iterations..