[Resource Topic] 2009/168: A Second Pre-image Attack Against Elliptic Curve Only Hash (ECOH)

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Title:
A Second Pre-image Attack Against Elliptic Curve Only Hash (ECOH)

Authors: Michael A. Halcrow, Niels Ferguson

Abstract:

We present a second pre-image attack on ECOH. Our attack requires 2^{143} time for ECOH-224 and ECOH-256, 2^{206} time for ECOH-384, and 2^{287} time for ECOH-512. The attack sets the checksum block to a fixed value and uses a collision search on the elliptic curve points.

ePrint: https://eprint.iacr.org/2009/168

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