Block Ciphers

Some articles on block ciphers, block cipher, cipher, ciphers, blocks, block:

Generalizations - Tweakable Block Ciphers
... Wagner have described a generalized version of block ciphers called "tweakable" block ciphers ... A tweakable block cipher accepts a second input called the tweak along with its usual plaintext or ciphertext input ... The tweak, along with the key, selects the permutation computed by the cipher ...
Modern Cryptography - Symmetric-key Cryptography
... Symmetric key ciphers are implemented as either block ciphers or stream ciphers ... A block cipher enciphers input in blocks of plaintext as opposed to individual characters, the input form used by a stream cipher ... The Data Encryption Standard (DES) and the Advanced Encryption Standard (AES) are block cipher designs which have been designated cryptography standards by the US government (though DES's ...
One-way Compression Function - Construction From Block Ciphers
... One-way compression functions are often built from block ciphers ... Block ciphers take (like one-way compression functions) two fixed size inputs (the key and the plaintext) and return one single output (the ciphertext) which is the same size as the input ... However, modern block ciphers are only partially one-way ...
Block Size (cryptography)
... In modern cryptography, symmetric key ciphers are generally divided into stream ciphers and block ciphers ... Block ciphers operate on a fixed length string of bits ... The length of this bit string is the block size ...
Avalanche Effect
... effect refers to a desirable property of cryptographic algorithms, typically block ciphers and cryptographic hash functions ... In the case of quality block ciphers, such a small change in either the key or the plaintext should cause a drastic change in the ciphertext ... If a block cipher or cryptographic hash function does not exhibit the avalanche effect to a significant degree, then it has poor randomization, and thus a ...

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