Cryptology ePrint Archive: Report 2021/1331

Communicating Through Subliminal-Free Signatures

George Teseleanu

Abstract: By exploiting the inherent randomness used by certain digital signature protocols, subliminal channels can subvert these protocols without degrading their security. Due to their nature, these channels cannot be easily detected by an outside observer. Therefore, they pose a severe challenge for protocol designers. More precisely, designers consider certain assumptions implicitly, but in reality these assumptions turn out to be false or cannot be enforced or verified. In this paper we exemplify exactly such a situation by presenting several subliminal channels with a small capacity in Zhang et al. and Dong et al.'s subliminal-free signature protocols.

Category / Keywords: cryptographic protocols / subliminal channels, cuckoo's channels, fail-stop channels, covert communication

Original Publication (in the same form): NordSec 2021

Date: received 1 Oct 2021

Contact author: george teseleanu at yahoo com

Available format(s): PDF | BibTeX Citation

Version: 20211005:154026 (All versions of this report)

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