Nimbus (cipher)
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This article is about the block cipher. For other uses, see Nimbus (disambiguation).
| Designer(s): | Alexis Machado |
|---|---|
| First published: | 2000 |
| Key size(s): | 128 bits |
| Block size(s): | 64 bits |
| Rounds: | 5 |
| Best public cryptanalysis: | |
| Differential cryptanalysis can break Nimbus with 256 chosen plaintexts. | |
In cryptography, Nimbus is a block cipher invented by Alexis Machado in 2000. It was submitted to the NESSIE project, but was not selected.
The algorithm uses a 128-bit key. It operates on blocks of 64 bits and consists of 5 rounds of encryption. The round function is exceedingly simple. In each round the block is XORed with a subkey, the order of its bits is reversed, and then it is multiplied mod 264 by another subkey, which is forced to be odd.
Nimbus was broken by Vladimir Furman; he found a differential attack using only 256 chosen plaintexts.
[edit] References
- Security evaluation of NESSIE first phase (PDF)
- Eli Biham, Vladimir Furman (2000-11-29). "Differential Cryptanalysis of Nimbus" (PDF/PostScript). Retrieved on 2007-02-08.
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