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- W2949105582 abstract "This paper provides a unified framework for improving PRF (pseudorandom function) advantages of several popular MACs (message authentication codes) based on a blockcipher modeled as RP (random permutation). In many known MACs, the inputs of the underlying blockcipher are defined to be some deterministic affine functions of previously computed outputs of the blockcipher. Keeping the similarity in mind, we introduce a class of ADEs (affine domain extensions) and a wide subclass of SADEs (secure ADE) containing C = {CBC-MAC, GCBC∗, OMAC, PMAC}. We define a parameter N(t, q) for each domain extension and show that all SADEs have PRF advantages O(tq/2 + N(t, q)/2) where t is the total number of blockcipher computations needed for all q queries. We prove that PRF advantage of any SADE is O(t/2) by showing that N(t, q) is always at most ( t 2 ) . We provide a better estimate O(tq) of N(t, q) for all members of C and hence these MACs have improved advantages O(tq/2). Our proposed bounds for CBC-MAC and GCBC∗ are better than previous best known bounds." @default.
- W2949105582 created "2019-06-27" @default.
- W2949105582 creator A5058556310 @default.
- W2949105582 date "2010-01-01" @default.
- W2949105582 modified "2023-09-28" @default.
- W2949105582 title "A Unified Method for Improving PRF Bounds for a Class of Blockcipher based MACs." @default.
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