# Signature Schemes Secure Against Hard-to-Invert Leakage

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## Abstract

*Side-channel attacks* allow the adversary to gain partial knowledge of the secret key when cryptographic protocols are implemented in real-world hardware. The goal of leakage resilient cryptography is to design cryptosystems that withstand such attacks. In the auxiliary input model, an adversary is allowed to see a *computationally hard-to-invert function* of the secret key. The auxiliary input model weakens the bounded leakage assumption commonly made in leakage resilient cryptography as the hard-to-invert function may information-theoretically reveal the entire secret key. In this work, we propose the *first* constructions of digital signature schemes that are secure in the auxiliary input model. Our main contribution is a digital signature scheme that is secure against *chosen message attacks* when given any *exponentially hard-to-invert function* of the secret key. As a second contribution, we construct a signature scheme that achieves security for *random messages* assuming that the adversary is given a *polynomial-time hard-to-invert* function (where both the challenge as well as the signatures seen prior to that are computed on random messages). Here, polynomial hardness is required even when given the entire public key. We further show that such signature schemes readily give us auxiliary input secure identification schemes.

## Notes

### Acknowledgments

The authors thank Yevgeniy Dodis for discussions at an early stage of this project.

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