Applied Cryptography by Bruce Schneier
Author:Bruce Schneier
Language: eng
Format: epub, azw3, pdf
ISBN: 9781119439028
Published: 2017-05-22T14:00:00+00:00
Designing a Block Cipher
It is easy to design a block cipher. If you think of a 64-bit block cipher as a permutation of the 64-bit numbers, it is clear that almost all of those permutations are secure. What is difficult is to design a block cipher that is not only secure, but can also be easily described and simply implemented.
It’s easy to design a block cipher if you have sufficient memory for 48*32 S-boxes. It’s hard to design an insecure DES variant if you iterate it for 128 rounds. If the length of your key is 512 bits, you really don’t care if there are key-complementation properties.
The real trick—and the reason that real-world block cipher design is very difficult—is to design a block cipher with the smallest possible key, the smallest possible memory requirement, and the fastest possible running time.
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