Crab (cipher)
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This article is about the block cipher. For other uses, see Crab (disambiguation).
| Designer(s): | Burt Kaliski, Matt Robshaw |
|---|---|
| First published: | 1993 |
| Derived from: | MD5 |
| Related to: | SHACAL |
| Key size(s): | 80 bits |
| Block size(s): | 8192 bits |
| Structure: | Cryptographic hash function |
In cryptography, Crab is a block cipher created by Burt Kaliski and Matt Robshaw in 1993. Not really intended for use, Crab was developed to demonstrate how ideas from hash functions could be used to create a fast cipher.
Crab has an unusually large block size of 8192 bits. Its creators suggested using an 80-bit key, but the cipher could use any key size. The key is used to generate two large sets of subkeys: a permutation of the numbers 0 through 255, and an array of 2048 32-bit numbers. The block is divided into 256 32-bit subblocks, which are permuted at the beginning. Then the algorithm makes four passes over the data, each time applying one of four transformations adapted from MD5.
[edit] References
- Schneier, Bruce (1996). Applied Cryptography, Second Edition. John Wiley & Sons, 342-344. ISBN 0-471-11709-9.
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