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- Xmx abstract "In cryptography, xmx is a block cipher designed in 1997 by DavidM'Raïhi, David Naccache, Jacques Stern, and Serge Vaudenay. According to thedesigners it "uses public-key-like operations as confusion and diffusion means." Thecipher was designed for efficiency, and the only operations it uses are XORsand modular multiplications.The main parameters of xmx are variable, including theblock size and key size, which are equal, as wellas the number of rounds. In addition to the key, it also makesuse of an odd modulus n which is small enough to fit in a single block.The round function is f(m)=(moa)·b mod n, where a and b aresubkeys and b is coprime to n. Here moa represents an operation thatequals m XOR a if that is less than n, and otherwise equals m. This is a simpleinvertible operation: moaoa = m. The xmx cipher consistsof an even number of iterations of the round function, followed by a final owith an additional subkey.The key schedule is very simple, using the same key for all the multipliers, andthree different subkeys for the others: the key itself for the first half of thecipher, its multiplicative inverse mod n for the last half, and the XOR of these twofor the middle subkey.The designers defined four specific variants of xmx: Standard: 512-bit block size, 8 rounds, n=2512-1 High security: 768-bit block size, 12 rounds, n=2768-1 Very-high security: 1024-bit block size, 16 rounds, n=21024-1 Challenge: 256-bit block size, 8 rounds, n=(280-1)·2176+157Borisov, et al., using a multiplicative form of differential cryptanalysis, found acomplementation property for any variant of xmx, like the first three above, such thatn=2k-1, where k is the block size. They also found large weak key classesfor the Challenge variant, and for many other moduli.".
- Xmx wikiPageExternalLink 19207.html.
- Xmx wikiPageExternalLink 672650.html.
- Xmx wikiPageID "9127817".
- Xmx wikiPageRevisionID "575997741".
- Xmx blockSize "variable".
- Xmx cryptanalysis "differential cryptanalysis, complementation property, weak keys".
- Xmx designers "David M'Raïhi, David Naccache, Jacques Stern, Serge Vaudenay".
- Xmx hasPhotoCollection Xmx.
- Xmx keySize "variable, equal to block size".
- Xmx name "xmx".
- Xmx publishDate "January 1997".
- Xmx rounds "variable, even".
- Xmx subject Category:Block_ciphers.
- Xmx type Abstraction100002137.
- Xmx type BlockCiphers.
- Xmx type Cipher106254239.
- Xmx type Communication100033020.
- Xmx type Message106253690.
- Xmx comment "In cryptography, xmx is a block cipher designed in 1997 by DavidM'Raïhi, David Naccache, Jacques Stern, and Serge Vaudenay. According to thedesigners it "uses public-key-like operations as confusion and diffusion means." Thecipher was designed for efficiency, and the only operations it uses are XORsand modular multiplications.The main parameters of xmx are variable, including theblock size and key size, which are equal, as wellas the number of rounds.".
- Xmx label "Xmx".
- Xmx sameAs m.027ypj7.
- Xmx sameAs Q8044864.
- Xmx sameAs Q8044864.
- Xmx sameAs Xmx.
- Xmx wasDerivedFrom Xmx?oldid=575997741.
- Xmx isPrimaryTopicOf Xmx.