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- Block_cipher abstract "In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks, with an unvarying transformation that is specified by a symmetric key. Block ciphers are important elementary components in the design of many cryptographic protocols, and are widely used to implement encryption of bulk data.The modern design of block ciphers is based on the concept of an iterated product cipher. Product ciphers were suggested and analyzed by Claude Shannon in his seminal 1949 publication Communication Theory of Secrecy Systems as a means to effectively improve security by combining simple operations such as substitutions and permutations. Iterated product ciphers carry out encryption in multiple rounds, each of which uses a different subkey derived from the original key. One widespread implementation of such ciphers is called a Feistel network, named after Horst Feistel, and notably implemented in the DES cipher. Many other realizations of block ciphers, such as the AES, are classified as substitution-permutation networks.The publication of the DES cipher by the U.S. National Bureau of Standards (now National Institute of Standards and Technology, NIST) in 1977 was fundamental in the public understanding of modern block cipher design. In the same way, it influenced the academic development of cryptanalytic attacks. Both differential and linear cryptanalysis arose out of studies on the DES design. Today, there is a palette of attack techniques against which a block cipher must be secure, in addition to being robust against brute force attacks.Even a secure block cipher is suitable only for the encryption of a single block under a fixed key. A multitude of modes of operation have been designed to allow their repeated use in a secure way, commonly to achieve the security goals of confidentiality and authenticity. However, block ciphers may also be used as building blocks in other cryptographic protocols, such as universal hash functions and pseudo-random number generators.".
- Block_cipher wikiPageExternalLink books?id=YiZKt_FcmYQC.
- Block_cipher wikiPageExternalLink bc.html.
- Block_cipher wikiPageExternalLink node.asp?id=2168.
- Block_cipher wikiPageExternalLink cs.html.
- Block_cipher wikiPageID "4594".
- Block_cipher wikiPageRevisionID "592579049".
- Block_cipher hasPhotoCollection Block_cipher.
- Block_cipher subject Category:Block_ciphers.
- Block_cipher subject Category:Cryptographic_primitives.
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- Block_cipher type CryptographicPrimitives.
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- Block_cipher comment "In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks, with an unvarying transformation that is specified by a symmetric key. Block ciphers are important elementary components in the design of many cryptographic protocols, and are widely used to implement encryption of bulk data.The modern design of block ciphers is based on the concept of an iterated product cipher.".
- Block_cipher label "Block cipher".
- Block_cipher label "Blockverschlüsselung".
- Block_cipher label "Blokvercijfering".
- Block_cipher label "Chiffrement par bloc".
- Block_cipher label "Cifrado por bloques".
- Block_cipher label "Cifratura a blocchi".
- Block_cipher label "Szyfr blokowy".
- Block_cipher label "Блочный шифр".
- Block_cipher label "ブロック暗号".
- Block_cipher label "分组密码".
- Block_cipher sameAs Bloková_šifra.
- Block_cipher sameAs Blockverschlüsselung.
- Block_cipher sameAs Cifrado_por_bloques.
- Block_cipher sameAs Chiffrement_par_bloc.
- Block_cipher sameAs Cifratura_a_blocchi.
- Block_cipher sameAs ブロック暗号.
- Block_cipher sameAs 블록_암호.
- Block_cipher sameAs Blokvercijfering.
- Block_cipher sameAs Szyfr_blokowy.
- Block_cipher sameAs m.01gnw.
- Block_cipher sameAs Q543151.
- Block_cipher sameAs Q543151.
- Block_cipher sameAs Block_cipher.
- Block_cipher wasDerivedFrom Block_cipher?oldid=592579049.
- Block_cipher isPrimaryTopicOf Block_cipher.