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• T-function abstract "In cryptography, a T-function is a bijective mapping that updates every bit of the state in a way that can be described as , or in simple words an update function in which each bit of the state is updated by a linear combination of the same bit and a function of a subset of its less significant bits. If every single less significant bit is included in the update of every bit in the state, such a T-function is called triangular. Thanks to their bijectivity (no collisions, therefore no entropy loss) regardless of the used Boolean functions and regardless of the selection of inputs (as long as they all come from one side of the output bit), T-functions are now widely used in cryptography to construct block ciphers, stream ciphers, PRNGs and hash functions. T-functions were first proposed in 2002 by A. Klimov and A. Shamir in their paper "A New Class of Invertible Mappings". Ciphers such as TSC-1, TSC-3, TSC-4, ABC, Mir-1 and VEST are built with different types of T-functions.Because arithmetic operations such as addition, subtraction and multiplication are also T-functions (triangular T-functions), software-efficient word-based T-functions can be constructed by combining bitwise logic with arithmetic operations. Another important property of T-functions based on arithmetic operations is predictability of their period, which is highly attractive to cryptographers. Although triangular T-functions are naturally vulnerable to guess-and-determine attacks, well chosen bitwise transpositions between rounds can neutralize that imbalance. In software-efficient ciphers, it can be done by interleaving arithmetic operations with byte-swapping operations and to a small degree with bitwise rotation operations. However, triangular T-functions remain highly inefficient in hardware.T-functions do not have any restrictions on the types and the widths of the update functions used for each bit. Subsequent transposition of the output bits and iteration of the T-function also do not affect bijectivity. This freedom allows the designer to choose the update functions or S-boxes that satisfy all other cryptographic criteria and even choose arbitrary or key-dependent update functions (see family keying).Hardware-efficient lightweight T-functions with identical widths of all the update functions for each bit of the state can thus be easily constructed. The core accumulators of VEST ciphers are a good example of such reasonably light-weight T-functions that are balanced out after 2 rounds by the transposition layer making all the 2-round feedback functions of roughly the same width and losing the "T-function" bias of depending only on the less significant bits of the state.".
• T-function thumbnail VEST_Core4_LowLevel.png?width=300.
• T-function wikiPageExternalLink daum05narrow.html.
• T-function wikiPageExternalLink klimov02new.html.
• T-function wikiPageExternalLink klimov03cryptographic.html.
• T-function wikiPageExternalLink t3.ps.gz.
• T-function wikiPageID "8585531".
• T-function wikiPageRevisionID "553418325".
• T-function hasPhotoCollection T-function.
• T-function subject Category:Cryptographic_primitives.
• T-function subject Category:Symmetric-key_cryptography.
• T-function type CausalAgent100007347.
• T-function type CryptographicPrimitives.
• T-function type LivingThing100004258.
• T-function type Object100002684.
• T-function type Organism100004475.
• T-function type Person100007846.
• T-function type PhysicalEntity100001930.
• T-function type Primitive109627462.
• T-function type Whole100003553.
• T-function type YagoLegalActor.
• T-function type YagoLegalActorGeo.
• T-function comment "In cryptography, a T-function is a bijective mapping that updates every bit of the state in a way that can be described as , or in simple words an update function in which each bit of the state is updated by a linear combination of the same bit and a function of a subset of its less significant bits. If every single less significant bit is included in the update of every bit in the state, such a T-function is called triangular.".
• T-function label "Fonction-T".
• T-function label "T-function".
• T-function sameAs Fonction-T.
• T-function sameAs m.0278ycx.
• T-function sameAs Q926281.
• T-function sameAs Q926281.
• T-function sameAs T-function.
• T-function wasDerivedFrom T-function?oldid=553418325.
• T-function depiction VEST_Core4_LowLevel.png.
• T-function isPrimaryTopicOf T-function.