A Framework for the Revocation of Unintended Digital Signatures Initiated by Malicious Terminals
IEEE Transactions on Dependable and Secure Computing
Conditional digital signatures
TrustBus'05 Proceedings of the Second international conference on Trust, Privacy, and Security in Digital Business
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We study the problem of how a user at an untrusted terminalcan generate digital signatures with the help of asmart card. This problem may arise in many practical applications;an example would be a user generating an electroniccheck at a merchant's terminal in a shop. The dangeris that the terminal can obtain a signature from the cardon an arbitrarily chosen document, that is different fromthe one displayed on the screen and confirmed by the user.We propose a solution to this problem which is based on anew concept called conditional signature. This leads to anew paradigm where digital signatures are not consideredas non-repudiable proofs, at least until a short deadline.