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Herding, Second Preimage and Trojan Message Attacks beyond Merkle-Damgård

  • Elena Andreeva
  • Charles Bouillaguet
  • Orr Dunkelman
  • John Kelsey
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5867)

Abstract

In this paper we present new attack techniques to analyze the structure of hash functions that are not based on the classical Merkle-Damgård construction. We extend the herding attack to concatenated hashes, and to certain hash functions that process each message block several times. Using this technique, we show a second preimage attack on the folklore “hash-twice” construction which process two concatenated copies of the message. We follow with showing how to apply the herding attack to tree hashes. Finally, we present a new type of attack — the trojan message attack, which allows for producing second preimages of unknown messages (from a small known space) when they are appended with a fixed suffix.

Keywords

Herding attack Second preimage attack Trojan message attack Zipper hash Concatenated hash Tree hash 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Elena Andreeva
    • 1
  • Charles Bouillaguet
    • 2
  • Orr Dunkelman
    • 2
  • John Kelsey
    • 3
  1. 1.ESAT/SCD — COSIC, Dept. of Electrical EngineeringKatholieke Universiteit Leuven and IBBT 
  2. 2.Ecole Normale Supérieure 
  3. 3.National Institute of Standards and Technology 

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