| Title | Eliminating Broadband Covert Channels in DSA-Like Signatures |
| Publication Type | Conference Paper |
| Year of Publication | 2021 |
| Authors | Fionov, Andrey, Klevtsov, Alexandr |
| Conference Name | 2021 XVII International Symposium "Problems of Redundancy in Information and Control Systems" (REDUNDANCY) |
| Keywords | Broadband communication, channel capacity, composability, compositionality, control systems, covert channel, covert channels, data communication, data hiding, digital signatures, DSA, pubcrawl, Public key, Redundancy, resilience, Resiliency, Scalability, steganography, subliminal channel |
| Abstract | The Digital Signature Algorithm (DSA) is a representative of a family of digital signature algorithms that are known to have a number of subliminal channels for covert data transmission. The capacity of these channels stretches from several bits (narrowband channels) to about 256 or so bits (a broadband channel). There are a couple of methods described in the literature to prevent the usage of the broadband channel with the help of a warden. In the present paper, we discuss some weaknesses of the known methods and suggest a solution that is free of the weaknesses and eliminates the broadband covert channel. Our solution also requires a warden who does not participate in signature generation and is able to check any signed message for the absence of the covert communication. |
| DOI | 10.1109/REDUNDANCY52534.2021.9606457 |
| Citation Key | fionov_eliminating_2021 |
Eliminating Broadband Covert Channels in DSA-Like Signatures