Abstract
This paper proposes a new hash construction based on the widely used Merkle-Damgård (MD) iteration [13,9]. It achieves the three basic properties required from a cryptographic hash function: collision (Coll), second preimage (Sec) and preimage (Pre) security. We show property preservation for the first two properties in the standard security model and the third Pre security property is proved in the random oracle model. Similar to earlier known hash constructions that achieve a form of Sec (eSec [16]) property preservation [4,17], we make use of fixed key material in the iteration. But while these hashes employ keys of size at least logarithmic in the message length (in blocks), we only need a small constant key size. Another advantage of our construction is that the underlying compression function is instantiated as a keyless primitive.
The Sec security of our hash scheme, however, relies heavily on the standard definitional assumption that the target messages are sufficiently random. An example of a practical application that requires Sec security and satisfies this definitional premise on the message inputs is the popular Cramer-Shoup encryption scheme [8]. Still, in practice we have other hashing applications where the target messages are not sampled from spaces with uniform distribution. And while our scheme is Sec preserving for uniform message distributions, we show that this is not always the case for other distributions.
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Andreeva, E., Preneel, B. (2009). A Three-Property-Secure Hash Function. In: Avanzi, R.M., Keliher, L., Sica, F. (eds) Selected Areas in Cryptography. SAC 2008. Lecture Notes in Computer Science, vol 5381. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04159-4_15
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