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- Merkle–Damgård_construction abstract "In cryptography, the Merkle–Damgård construction or Merkle–Damgård hash function is a method of building collision-resistant cryptographic hash functions from collision-resistant one-way compression functions. This construction was used in the design of many popular hash algorithms such as MD5, SHA1 and SHA2.The Merkle–Damgård construction was described in Ralph Merkle's Ph.D. thesis in 1979. Ralph Merkle and Ivan Damgård independently proved that the structure is sound: that is, if an appropriate padding scheme is used and the compression function is collision-resistant, then the hash function will also be collision resistant.The Merkle–Damgård hash function first applies an MD-compliant padding function to create an output whose size is a multiple of a fixed number (e.g. 512 or 1024) — this is because compression functions cannot handle inputs of arbitrary size. The hash function then breaks the result into blocks of fixed size, and processes them one at a time with the compression function, each time combining a block of the input with the output of the previous round. In order to make the construction secure, Merkle and Damgård proposed that messages be padded with a padding that encodes the length of the original message. This is called length padding or Merkle–Damgård strengthening.In the diagram, the one-way compression function is denoted by f, and transforms two fixed length inputs to an output of the same size as one of the inputs. The algorithm starts with an initial value, the initialization vector (IV). The IV is a fixed value (algorithm or implementation specific). For each message block, the compression (or compacting) function f takes the result so far, combines it with the message block, and produces an intermediate result. The last block is padded with zeros as needed and bits representing the length of the entire message are appended. (See below for a detailed length padding example.)To harden the hash further the last result is then sometimes fed through a finalisation function. The finalisation function can have several purposes such as compressing a bigger internal state (the last result) into a smaller output hash size or to guarantee a better mixing and avalanche effect on the bits in the hash sum. The finalisation function is often built by using the compression function (Note that in some documents instead the act of length padding is called "finalisation").".
- Merkle–Damgård_construction thumbnail Merkle-Damgard_hash_big.svg?width=300.
- Merkle–Damgård_construction wikiPageExternalLink hac.
- Merkle–Damgård_construction wikiPageExternalLink imc.html.
- Merkle–Damgård_construction wikiPageID "4076217".
- Merkle–Damgård_construction wikiPageLength "12754".
- Merkle–Damgård_construction wikiPageOutDegree "28".
- Merkle–Damgård_construction wikiPageRevisionID "675438248".
- Merkle–Damgård_construction wikiPageWikiLink Avalanche_effect.
- Merkle–Damgård_construction wikiPageWikiLink Category:Cryptographic_hash_functions.
- Merkle–Damgård_construction wikiPageWikiLink Collision_resistance.
- Merkle–Damgård_construction wikiPageWikiLink Cryptographic_hash_function.
- Merkle–Damgård_construction wikiPageWikiLink Cryptography.
- Merkle–Damgård_construction wikiPageWikiLink Doctor_of_Philosophy.
- Merkle–Damgård_construction wikiPageWikiLink Flickr.
- Merkle–Damgård_construction wikiPageWikiLink Initialization_vector.
- Merkle–Damgård_construction wikiPageWikiLink Ivan_Damgård.
- Merkle–Damgård_construction wikiPageWikiLink Length_extension_attack.
- Merkle–Damgård_construction wikiPageWikiLink MD5.
- Merkle–Damgård_construction wikiPageWikiLink Mihir_Bellare.
- Merkle–Damgård_construction wikiPageWikiLink One-way_compression_function.
- Merkle–Damgård_construction wikiPageWikiLink Padding_(cryptography).
- Merkle–Damgård_construction wikiPageWikiLink Preimage_attack.
- Merkle–Damgård_construction wikiPageWikiLink Ralph_Merkle.
- Merkle–Damgård_construction wikiPageWikiLink Random_oracle.
- Merkle–Damgård_construction wikiPageWikiLink SHA-1.
- Merkle–Damgård_construction wikiPageWikiLink SHA-2.
- Merkle–Damgård_construction wikiPageWikiLink SHA1.
- Merkle–Damgård_construction wikiPageWikiLink SHA2.
- Merkle–Damgård_construction wikiPageWikiLink Souradyuti_Paul.
- Merkle–Damgård_construction wikiPageWikiLink Thesis.
- Merkle–Damgård_construction wikiPageWikiLink File:FastWidePipeHashFunction.png.
- Merkle–Damgård_construction wikiPageWikiLink File:Merkle-Damgard_hash_big.svg.
- Merkle–Damgård_construction wikiPageWikiLink File:WidePipeHashFunction.png.
- Merkle–Damgård_construction wikiPageWikiLinkText "Block".
- Merkle–Damgård_construction wikiPageWikiLinkText "Fast Wide-pipe Hash Mode".
- Merkle–Damgård_construction wikiPageWikiLinkText "Fast-widepipe".
- Merkle–Damgård_construction wikiPageWikiLinkText "Length".
- Merkle–Damgård_construction wikiPageWikiLinkText "Merkle–Damgård construction".
- Merkle–Damgård_construction wikiPageWikiLinkText "Merkle–Damgård construction#MD-compliant padding".
- Merkle–Damgård_construction wikiPageWikiLinkText "Merkle–Damgård hash functions".
- Merkle–Damgård_construction wikiPageWikiLinkText "Merkle–Damgård".
- Merkle–Damgård_construction hasPhotoCollection Merkle–Damgård_construction.
- Merkle–Damgård_construction wikiPageUsesTemplate Template:Citation_needed.
- Merkle–Damgård_construction wikiPageUsesTemplate Template:Cryptography_navbox.
- Merkle–Damgård_construction wikiPageUsesTemplate Template:Rp.
- Merkle–Damgård_construction subject Category:Cryptographic_hash_functions.
- Merkle–Damgård_construction comment "In cryptography, the Merkle–Damgård construction or Merkle–Damgård hash function is a method of building collision-resistant cryptographic hash functions from collision-resistant one-way compression functions. This construction was used in the design of many popular hash algorithms such as MD5, SHA1 and SHA2.The Merkle–Damgård construction was described in Ralph Merkle's Ph.D. thesis in 1979.".
- Merkle–Damgård_construction label "Merkle–Damgård construction".
- Merkle–Damgård_construction sameAs Merkles_Meta-Verfahren.
- Merkle–Damgård_construction sameAs Construction_de_Merkle-Damgård.
- Merkle–Damgård_construction sameAs שיטת_מרקל-דמגרד.
- Merkle–Damgård_construction sameAs m.0bgw31.
- Merkle–Damgård_construction sameAs Структура_Меркла_—_Дамгарда.
- Merkle–Damgård_construction sameAs Будова_Меркла-Демґарда.
- Merkle–Damgård_construction sameAs Q1757463.
- Merkle–Damgård_construction sameAs Q1757463.
- Merkle–Damgård_construction wasDerivedFrom Merkle–Damgård_construction?oldid=675438248.
- Merkle–Damgård_construction depiction Merkle-Damgard_hash_big.svg.
- Merkle–Damgård_construction isPrimaryTopicOf Merkle–Damgård_construction.