Translation and analysis of words by ChatGPT artificial intelligence
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What (who) is Q (cipher) - definition
![Q with diagonal stroke in [[Doulos SIL]]](https://commons.wikimedia.org/wiki/Special:FilePath/Qwithdiagonalstroke (cropped).png?width=200 "Q with diagonal stroke in [[Doulos SIL]]")
![French-language]] extract of page 9 of [[Joachim du Bellay]]'s 1549 work ''[[La Défense et illustration de la langue française]]''. The text of the extract is: ''Barbares anciẽnement etoint nõmez ceux, '''ꝗ''' ĩeptemẽt ꝑloint Grec.''](https://commons.wikimedia.org/wiki/Special:FilePath/Ꝗ used in a sentence (French).jpg?width=200 "French-language]] extract of page 9 of [[Joachim du Bellay]]'s 1549 work ''[[La Défense et illustration de la langue française]]''. The text of the extract is: ''Barbares anciẽnement etoint nõmez ceux, '''ꝗ''' ĩeptemẽt ꝑloint Grec.''")
Wikipedia
In cryptography, Q is a block cipher invented by Leslie McBride. It was submitted to the NESSIE project, but was not selected.
The algorithm uses a key size of 128, 192, or 256 bits. It operates on blocks of 128 bits using a substitution–permutation network structure. There are 8 rounds for a 128-bit key and 9 rounds for a longer key. Q uses S-boxes adapted from Rijndael (also known as AES) and Serpent. It combines the nonlinear operations from these ciphers, but leaves out all the linear transformations except the permutation. Q also uses a constant derived from the golden ratio as a source of "nothing up my sleeve numbers".
Q is vulnerable to linear cryptanalysis; Keliher, Meijer, and Tavares have an attack that succeeds with 98.4% probability using 297 known plaintexts.
