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Qu'est-ce (qui) est Q (cipher) - définition

BLOCK CIPHER

Q (block cipher)

Q (cipher)

In cryptography, Q is a block cipher invented by Leslie McBride. It was submitted to the NESSIE project, but was not selected.

https://en.wikipedia.org/wiki/Q_(cipher)

Q with stroke

LETTER OF THE LATIN ALPHABET

Q̵; Ꝗ; Ꝗꝗ; Ꝙ

Q with stroke (Ꝗ, ꝗ) is a letter of the Latin alphabet, derived from writing the letter Q with the addition of a bar through the letter's descender. The letter was used by scribes during the Middle Ages, where it was employed primarily as an abbreviationa modern parallel of this would be abbreviating the word "and" with an ampersand (&).

https://en.wikipedia.org/wiki/Q_with_stroke

XOR cipher

ENCRYPTION BY SIMPLE EXCLUSIVE-OR LOGIC OPERATIONS

Simple XOR Cipher; Simple XOR cipher; XOR encryption; Xor encryption; Xor cipher

In cryptography, the simple XOR cipher is a type of additive cipher, an encryption algorithm that operates according to the principles:

https://en.wikipedia.org/wiki/XOR_cipher

Wikipédia

Q (cipher)

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.

https://en.wikipedia.org/wiki/Q (cipher)