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- W4386108889 abstract "At Eurocrypt 2006, Rogaway and Shrimpton presented the idea of vector-input MAC that accepts a vector consisting of variable-length bitstrings. They proposed S2V as a concrete instantiation of the vector-input MAC and S2V is more efficient than the classical method, encoding a vector into a single bitstring and then applying a conventional MAC such as CMAC. However, S2V severely limits the maximum number of elements in a vector. Moreover, the security is up to the birthday bound with respect to the block length of the underlying block cipher (i.e., n/2-bit security for n-bit block). To overcome these drawbacks, we use tweakable block ciphers (TBCs) and present a new vector-input MAC, called PMAC $$r$$ x, taking PMAC2x by List and Nandi (CT-RSA 2017) as the baseline scheme. Our proposal allows a significantly larger number of elements than S2V and enjoys the beyond-the-birthday-bound (BBB) security. PMAC $$r$$ x is more efficient than the encode-then-PMAC2x method with respect to the number of primitive calls, as in the case of S2V (where the comparison is made with CMAC)." @default.
- W4386108889 created "2023-08-24" @default.
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- W4386108889 date "2023-01-01" @default.
- W4386108889 modified "2023-09-26" @default.
- W4386108889 title "PMAC$$r$$x: A Vector-Input MAC for High-Dimensional Vectors with BBB Security" @default.
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- W4386108889 doi "https://doi.org/10.1007/978-3-031-41326-1_5" @default.
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