## Cryptology ePrint Archive: Report 2002/058

Construction of UOWHF: Tree Hashing Revisited

Palash Sarkar

Abstract: We present a binary tree based parallel algorithm for extending the domain of a UOWHF. The key length expansion is $2m$ bits for $t=2$; $m(t+1)$ bits for $3\leq t\leq 6$ and $m\times(t+\lfloor\log_2 (t-1)\rfloor)$ bits for $t\geq 7$, where $m$ is the length of the message digest and $t\geq 2$ is the height of the binary tree.

Category / Keywords: UOWHF, hash function, binary tree

Date: received 12 May 2002, last revised 16 Feb 2004

Contact author: palash at isical ac in

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | BibTeX Citation

Note: The revision removes some minor but potentially confusing typos.

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