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The xor–encrypt–xor (XEX) is a (tweakable) mode of operation of a block cipher. In tweaked-codebook mode with ciphertext stealing , it is one of the more popular modes of operation for whole-disk encryption. XEX is also a common form of key whitening, and part of some smart card proposals. [1] [2]
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Another tweakable encryption mode, XEX (xor–encrypt–xor), was designed by Rogaway [11] to allow efficient processing of consecutive blocks (with respect to the cipher used) within one data unit (e.g., a disk sector).
If the IV/nonce is random, then they can be combined with the counter using any invertible operation (concatenation, addition, or XOR) to produce the actual unique counter block for encryption. In case of a non-random nonce (such as a packet counter), the nonce and counter should be concatenated (e.g., storing the nonce in the upper 64 bits and ...
In cryptography, the simple XOR cipher is a type of additive cipher, [1] an encryption algorithm that operates according to the principles: A ⊕ {\displaystyle \oplus } 0 = A, A ⊕ {\displaystyle \oplus } A = 0,
Xor–encrypt–xor (XEX), a (tweakable) mode of operation of a block cipher. Morimoto XEX, the Michelin Star-winning Tokyo restaurant of Masaharu Morimoto..XEX, a type of file used for video games or other applications developed for the Microsoft Xbox 360 game console. It is designed to run on an Xbox 360 and is not meant to be opened on a PC.
Say we send messages A and B of the same length, both encrypted using same key, K. The stream cipher produces a string of bits C(K) the same length as the messages. The encrypted versions of the messages then are: E(A) = A xor C E(B) = B xor C. where xor is performed bit by bit. Say an adversary has intercepted E(A) and E(B). They can easily ...