Security of Blind Signatures under Aborts
- Marc FischlinAffiliated withDarmstadt University of Technology
- , Dominique SchröderAffiliated withDarmstadt University of Technology
We explore the security of blind signatures under aborts where the user or the signer may stop the interactive signature issue protocol prematurely. Several works on blind signatures discuss security only in regard of completed executions and usually do not impose strong security requirements in case of aborts. One of the exceptions is the paper of Camenisch, Neven and shelat (Eurocrypt 2007) where the notion of selective-failure blindness has been introduced. Roughly speaking, selective-failure blindness says that blindness should also hold in case the signer is able to learn that some executions have aborted.
Here we augment the work of Camenisch et al. by showing how to turn every secure blind signature scheme into a selective-failure blind signature scheme. Our transformation only requires an additional computation of a commitment and therefore adds only a negligible overhead. We also study the case of multiple executions and notions of selective-failure blindness in this setting. We then discuss the case of user aborts and unforgeability under such aborts. We show that every three-move blind signature scheme remains unforgeable under such user aborts. Together with our transformation for selective-failure blindness we thus obtain an easy solution to ensure security under aborts of either party and which is applicable for example to the schemes of Pointcheval and Stern (Journal of Cryptology, 2000).
We finally revisit the construction of Camenisch et al. for simulatable adaptive oblivious transfer protocols, starting from selective-failure blind signatures where each message only has one valid signature (uniqueness). While our transformation to achieve selective-failure blindness does not preserve uniqueness, it can still be combined with a modified version of their protocol. Hence, we can derive such oblivious transfer protocols based on unique blind signature schemes only (in the random oracle model), without necessarily requiring selective-failure blindness from scratch.
- Security of Blind Signatures under Aborts
- Book Title
- Public Key Cryptography – PKC 2009
- Book Subtitle
- 12th International Conference on Practice and Theory in Public Key Cryptography, Irvine, CA, USA, March 18-20, 2009. Proceedings
- pp 297-316
- Print ISBN
- Online ISBN
- Series Title
- Lecture Notes in Computer Science
- Series Volume
- Series ISSN
- Springer Berlin Heidelberg
- Copyright Holder
- Springer-Verlag Berlin Heidelberg
- Additional Links
- Industry Sectors
- eBook Packages
- Editor Affiliations
- 16. Department of Computer Science, University of California
- 17. Computer Science Department, University of California
- Author Affiliations
- 18. Darmstadt University of Technology, Germany
To view the rest of this content please follow the download PDF link above.