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Digital signature with secretly embedded warning

Durnoga K., Pomykała J., Trabszys T.

Control and Cybernetics

2013

Vol. 42, no. 4

805--824

We present a digital signature scheme with secretly embedded warning. The embedded warning is a protection mechanism in case of restraint or blackmail. Extending ordinary digital signatures we propose schemes where a signer, approached by a powerful adversary that demands handing over a signing key, can disclose his private key. In our solution the signer is able to generate a feigned key indistinguishable from the genuine one. Then such a key can be used to embed a special warning message within a signature to indicate coercion. Such warnings can be transferred via subliminal channel to some trusted authority.

ID-Based Digital Signatures with Security Enhanced Approach

Pomykała J.

Journal of Telecommunications and Information Technology

2009

nr 4

146-153

In the paper the ID-based digital signatures with signer's protection in case of the private key compromising is investigated. The proposed protocols have two main ingredients. First is the application of the credential system for the suitable verification key approval. Second is the application of the subliminal channel together with the interactive generation of the secret key, to obtain the increased resistance of the system against the powerful adversary. The particular interest was turned towards the significance of the deniable encryption in creation of the corresponding protocols.