MASH-1 is modular arithmetic based hash function. It is presented in Part 4 of ISO/IEC 10118
standard for one and a half decade. Cryptographic strength of MASH-1 hash function is based on
factorization problem of an RSA modulus along with redundancy in the input blocks of compression
functions. Despite of this, we are able to introduce two large classes of moduli which allow
practical time collision finding algorithm for MASH-1. In one case even multicollisions of
arbitrary length can be constructed.
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