Cryptology ePrint Archive: Report 2012/558

Domain-Specifi c Pseudonymous Signatures for the German Identity Card

Jens Bender and Özgür Dagdelen and Marc Fischlin and Dennis Kügler

Abstract: The restricted identi cation protocol for the new German identity card basically provides a method to use pseudonyms such that they can be linked by individual service providers, but not across diff erent service providers (even not malicious ones). The protocol can be augmented to allow also for signatures under the pseudonyms. In this paper, we thus view---and defi ne---this idea more abstractly as a new cryptographic signature primitive with some form of anonymity, and use the term domain-specifi c pseudonymous signatures. We then analyze the restricted identi cation solutions in terms of the formal security requirements.

Category / Keywords: public-key cryptography / restricted identification, German ID card, signatures

Publication Info: A preliminary version appears in: Information Security - 15th International Conference (ISC) 2012, Lecture Notes in Computer Science, Vol.7483, pp.104-119, Springer-Verlag, 2012.

Date: received 27 Sep 2012, last revised 27 Sep 2012

Contact author: oezguer dagdelen at cased de

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Version: 20120930:002238 (All versions of this report)

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