## Cryptology ePrint Archive: Report 2004/010

Tom St Denis

Abstract: We prove that the fast pseudo-Hadamard transform (FPHT) over a finite field has a bounded branch number. We shall demonstrate that the transform has an efficient implementation for various platforms compared to an equal dimension MDS code. We prove that when using a CS-Cipher\cite{CSC} like construction the weight of any $2R$ trail is bounded for the case of an $8 \times 8$ transform. We show that the FPHT can also be combined with MDS codes to produce efficient transforms with half of the branch of a comparable sized MDS code. We present the FPHT-HASH one-way hash function which is constructed using a $32 \times 32$ FPHT which produces a $256$-bit digest and processes the input at 24 cycles per byte with ISO C source code on an AMD Athlon XP processor.

Category / Keywords: secret-key cryptography / Pseudo-Hadamard Transform, Branch Analysis, One-Way Hash Function

Date: received 16 Jan 2004, last revised 2 Feb 2004

Contact author: tomstdenis at iahu ca

Available format(s): PDF | BibTeX Citation

Note: Minor typographical errors fixed.

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