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Pseudo random oracle of Merkle-Damgård hash functions revisited

  • Kamel Ammour
  • Lei Wang
  • Dawu Gu
Research Paper
  • 5 Downloads

Abstract

Following the well-known random oracle Methodology, a cryptographic hash function is required to satisfy the property of pseudo-random oracle (PRO), that is indifferentiable from a random oracle. This paper revisits the PRO property of popular hash function modes purely from a theoretical point of view. OriginalMerkle-Damgård mode (sometimes referred to as Strengthened Merkle-Damgård) does not satisfy the PRO security due to the length-extension attack. To remedy it, a series of variants have been proposed with tweaks of either adopting a prefix-free padding or modifying the final primitive call. From these tweaks, we derive a common structural property named prefix-free computing. Indeed, all PRO-secure Merkle-Damgård variants published so far are prefix-free computing. Hence, an interesting question with respect to the nature of PRO security arises: is prefix-free computing a necessary condition for PRO-secure Merkle-Damgård hash function? This paper gives a negative answer. We investigate the difference between length-extension resistance and prefix-free computing, and find that length-extension resistance does not necessarily imply prefix-free computing. Consequently, we construct a dedicated Merkle-Damgård variant as a counterexample that is PRO-secure but not prefix-free computing.

Keywords

Merkle-Damgård random oracle indifferentiability prefix free length extension attack 

Notes

Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 61602302, 61472250, 61672347), Natural Science Foundation of Shanghai (Grant No. 16ZR1416400), Shanghai Excellent Academic Leader Funds (Grant No. 16XD1401300), and 13th Five-Year National Development Fund of Cryptography (Grant No. MMJJ20170114).

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Kamel Ammour
    • 1
  • Lei Wang
    • 1
    • 2
  • Dawu Gu
    • 1
  1. 1.School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Westone Cryptologic Research CenterBeijingChina

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