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ISW
2004
Springer

How to Break and Repair a Universally Composable Signature Functionality

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How to Break and Repair a Universally Composable Signature Functionality
Abstract. Canetti and Rabin recently proposed a universally composable ideal functionality FSIG 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 functionality is presented. We show that our improved functionality can be securely realized by precisely those signature schemes that are secure against existential forgery under adaptive chosen-message attacks.
Michael Backes, Dennis Hofheinz
Added 02 Jul 2010
Updated 02 Jul 2010
Type Conference
Year 2004
Where ISW
Authors Michael Backes, Dennis Hofheinz
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