NIMBUS (CIPHER)

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.

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References

References

★ Security evaluation of NESSIE first phase (PDF)

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