Blank Digital Signatures: Optimization and Practical Experiences

Abstract : Blank Digital Signatures BDS [18] enable an originator to delegate the signing rights for a template, containing fixed and exchangeable elements, to a proxy. The proxy is then able to choose one of the predefined values for each exchangeable element and issue a signature for such an instantiation of the template on behalf of the originator. In this paper, we propose optimizations for the BDS scheme from [18] and present a library, integrating this optimized version within the Java Cryptography Architecture and the keying material into X.509 certificates. To illustrate the flexibility of the proposed library, we introduce two proof-of-concept implementations building up on XML and PDF, respectively. Finally, we give a detailed insight in the performance of the protocol and our implementation.
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David Derler, Christian Hanser, Daniel Slamanig. Blank Digital Signatures: Optimization and Practical Experiences. Jan Camenisch; Simone Fischer-Hübner; Marit Hansen. Privacy and Identity Management for the Future Internet in the Age of Globalisation: 9th IFIP WG 9.2, 9.5, 9.6/11.7, 11.4, 11.6/SIG 9.2.2, International Summer School, Patras, Greece, September 7–12, 2014, AICT-457, Springer, pp.201-215, 2015, IFIP Advances in Information and Communication Technology (TUTORIAL), 978-3-319-18620-7. ⟨10.1007/978-3-319-18621-4_14⟩. ⟨hal-01431579⟩

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