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Paper 2017/984

Self-Guarding Cryptographic Protocols against Algorithm Substitution Attacks

Marc Fischlin and Sogol Mazaheri

Abstract

We put forward the notion of self-guarding cryptographic protocols as a countermeasure to algorithm substitution attacks. Such self-guarding protocols can prevent undesirable leakage by subverted algorithms if one has the guarantee that the system has been properly working in an initialization phase. Unlike detection-based solutions they thus proactively thwart attacks, and unlike reverse firewalls they do not assume an online external party. We present constructions of basic primitives for (public-key and private-key) encryption and for signatures. We also argue that the model captures attacks with malicious hardware tokens and show how to self-guard a PUF-based key exchange protocol.

Metadata
Available format(s)
PDF
Publication info
Preprint. MINOR revision.
Contact author(s)
sogol mazaheri @ cryptoplexity de
History
2018-08-20: last of 2 revisions
2017-10-09: received
See all versions
Short URL
https://ia.cr/2017/984
License
Creative Commons Attribution
CC BY
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