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**2003/245**

**Title:**

A Key Substitution Attack on SFLASH^{v3}

**Authors:**
Willi Geiselmann, Rainer Steinwandt

**Abstract:**

A practical key substitution attack on SFLASH^{v3} is described: Given a valid (message, signature) pair (m,\sigma) for some public key v_0, one can derive another public key v_1 (along with matching secret data) such that (m,\sigma) is also valid for v_1. The computational effort needed for finding such a `duplicate’ key is comparable to the effort needed for ordinary key generation.

**ePrint:**
https://eprint.iacr.org/2003/245

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