• Title/Summary/Keyword: CRHF

Search Result 1, Processing Time 0.012 seconds

Construction of UOWHF based on Block Cipher (유니버설 일방향 해쉬 함수에 대한 블록 암호 기반 구성 방법)

  • 이원일
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.14 no.1
    • /
    • pp.101-111
    • /
    • 2004
  • Preneel, Govaerts, and Vandewalle considered the 64 basic ways to construct a collision resistant hash function from a block cipher. They regarded 12 of these 64 schemes as secure, though no proofs or formal claims were given. Black, Rogaway, and Shrimpton presented a more proof-centric look at the schemes from PGV. They proved that, in the black box model of block cipher, 12 of 64 compression functions are CRHFs and 20 of 64 extended hash functions are CRHFs. In this paper, we present 64 schemes of block-cipher-based universal one way hash functions using the main idea of PGV and analyze these schemes in the black box model. We will show that 30 of 64 compression function families UOWHF and 42 of 64 extended hash function families are UOWHF. One of the important results is that, in this black box model, we don't need the mask keys for the security of UOWHF in contrast with the results in general security model of UOWHF. Our results also support the assertion that building an efficient and secure UOWHF is easier than building an efficient and secure CRHF.