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Recently we showed how to justify a Dolev-Yao type model of cryptography as used in virtually all automated protocol provers under active attacks and in arbitrary protocol environments. The justification was done by defining an ideal system handling Dolev-Yao-style terms and a cryptographic realization with the same user interface, and by showing that the realization is as secure as the ideal system...
This paper describes a powerful attack on a verifiably committed signature scheme based on GPS and RSA proposed in Financial Cryptography 2001. Given any partial signature, the attacker can extract the corresponding full signature. The attack works provided the attacker previously obtained a full signature of a special form, which can be done simply by eavesdropping a very small number of full signatures...
Canetti and Rabin recently proposed a universally composable ideal functionality for digital signatures. We show that this functionality cannot be securely realized by any signature scheme, thereby disproving their result that any signature scheme that is existentially unforgeable under adaptive chosen-message attack is a secure realization. Next, an improved signature...
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