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- W3031430546 abstract "HMAC was proved in [4] to be a PRF assuming that (1) the underlying compression function is a PRF, and (2) the iterated hash function is weakly collision-resistant. However, subsequent attacks showed that assumption (2) is false for MD5 and SHA-1, removing the proof-based support for HMAC in these cases. This paper proves that HMAC is a PRF under the sole assumption that the compression function is a PRF. This recovers a proof based guarantee since no known attacks compromise the pseudorandomness of the compression function, and it also helps explain the resistance to attack that HMAC has shown even when implemented with hash functions whose (weak) collision resistance is compromised. We also show that an even weakerthan-PRF condition on the compression function, namely that it is a privacy-preserving MAC, suces to establish HMAC is a secure MAC as long as the hash function meets the very weak requirement of being computationally almost universal, where again the value lies in the fact that known attacks do not invalidate the assumptions made." @default.
- W3031430546 created "2020-06-05" @default.
- W3031430546 creator A5033480276 @default.
- W3031430546 date "2006-01-01" @default.
- W3031430546 modified "2023-09-28" @default.
- W3031430546 title "New Proofs for NMAC and HMAC: Security Without Collision-Resistance." @default.
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