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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. ==References== * (Security evaluation of NESSIE first phase (PDF) ) * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nimbus (cipher)」の詳細全文を読む スポンサード リンク
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