By Robshaw M. J.
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Additional resources for Block Ciphers
Since no one can equal the resources and expertise that can be marshaled by the federal agencies both for the design and the cryptanalysis of cryptosystems, it is disappointing to nd that the next proposed block cipher for federal standardization is to be classied. What seems to be needed is a fast secure block cipher that can be eciently implemented in software. Until then, implementers will be forced to adopt a half-way house whereby the security they require is achieved by the use of a DES derivative such as triple-encryption DES.
The cipher is fully parameterized in that the block size, the key size and the number of rounds can all vary. A likely version of RC5 is perhaps 8. RC5 33 RC5-32/16/10 where the block size is 64 bits, there are 16 rounds and the key is 10 bytes in length. The algorithm begins by expanding a variable-length key into a set of look-up tables. Then two very simple operations are used repeatedly to mix in the key and transform the data. RC5 is another example of an iterated, non-Feistel cipher. Due to its elegant simplicity, it will be of no surprise to nd that RC5 is very fast | 32 rounds of RC5 with a 64-bit block size has roughly the same encryption speed as SAFER K-64 with six rounds.
Perhaps the best approach is to use a judicious mix of both \math-made" and \man-made" techniques. 1 DES variants It is of interest to see how DES performs when certain features are changed. Particular interest is often focused on the S-boxes though other alterations to both the detail and the structure of DES can be considered. Regarding the S-boxes, randomly chosen S-boxes are very unlikely to be secure. 2) and it is exceedingly unlikely that an S-box, or combination of S-boxes, with security equal to or better than those in DES will be found at random.