Cryptology ePrint Archive: Report 2013/408

Highly Controlled, Fine-grained Delegation of Signing Capabilities

Michael Backes and Sebastian Meiser and Dominique Schröder

Abstract: Delegation of signing rights is a central problem in security. Whereas delegating by giving power of attorney is well studied and digitally realized via delegatable anonymous credentials, directly delegating signing possibilities without the need for an external logic, can be done via malleable signature schemes. However, the existing schemes do not allow for privacy preserving, fine-grained malleability and they do not allow for a controlled way of further delegating the malleability. We bridge this gap by introducing delegatable functional signatures (DFS).

Category / Keywords: public-key cryptography / Functional signatures, delegatable functional signatures, malleable signature schemes

Date: received 20 Jun 2013

Contact author: ds at ca cs uni-saarland de

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Version: 20130625:155112 (All versions of this report)

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