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Home > Art, Film & Photography > Message Authentication Codes: Vest
Message Authentication Codes: Vest

Message Authentication Codes: Vest


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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: VEST (Very Efficient Substitution Transposition) ciphers are a set of families of general-purpose hardware-dedicated ciphers that support single pass authenticated encryption and can operate as collision-resistant hash functions designed by Sean O'Neil, Benjamin Gittins and Howard Landman. VEST cannot be implemented efficiently in software. VEST is based on a balanced T-function that can also be described as a bijective nonlinear feedback shift register with parallel feedback (NLPFSR) or as a substitution-permutation network, which is assisted by a non-linear RNS based counter. The four VEST family trees described in the cipher specification are VEST-4, VEST-8, VEST-16, and VEST-32. VEST ciphers support keys and IVs of variable sizes and instant re-keying. All VEST ciphers release output on every clock cycle. All the VEST variants are covered by European Patent Number EP 1820295(B1), owned by Synaptic Laboratories. VEST was a Phase 2 Candidate in the eSTREAM competition in the hardware portfolio, but was not a Phase 3 or Focus candidate and so is not part of the final portfolio. VEST ciphers consist of four components: a non-linear counter, a linear counter diffusor, a bijective non-linear accumulator with a large state and a linear output combiner (as illustrated by the image on the top-right corner of this page). The RNS counter consists of sixteen NLFSRs with prime periods, the counter diffusor is a set of 5-to-1 linear combiners with feedback compressing outputs of the 16 counters into 10 bits while at the same time expanding the 8 data inputs into 9 bits, the core accumulator is an NLPFSR accepting 10 bits of the counter diffusor as its input, and the output combiner is a set of 6-to-1 linear combiners. The core accumulator in VEST ciph... More: http://booksllc.net/?id=2613536


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Product Details
  • ISBN-13: 9781156298008
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Vest
  • Width: 229 mm
  • ISBN-10: 1156298008
  • Publisher Date: 31 May 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 77 gr


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