Security Enhancement of the Vortex Family of Hash Functions

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Executive Summary

Vortex is a new family of one-way hash functions which has been submitted to the NIST SHA-3 competition. Its design is based on using the Rijndael block cipher round as a building block, and using a multiplication-based merging function to support fast mixing in a small number of steps. Vortex is designed to be a fast hash function, when running on a processor that has AES acceleration and has a proven collision resistance. Several attacks on Vortex have been recently published exploiting some structural properties of its design, as presented in the version submitted to the SHA-3 competition.

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