NDLI: Dynamic fully forward-secure group signatures

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Dynamic fully forward-secure group signatures

Content Provider	ACM Digital Library
Author	Libert, Benoît Yung, Moti
Abstract	Enhancing user privacy while allowing the use of digital credentials in network-wide applications is a very active area. Group signatures are primary privacy-preserving credentials that enable both, non-repudiation and abuser-tracing. When embedding cryptographic tools in actual computing systems, it is important to ensure physical layer protection to cryptographic keys. A simple risk analysis shows that taking advantage of system (i.e., hardware, software, network) vulnerabilities is usually much easier than cryptanalyzing the cryptographic primitives themselves. Forward-secure cryptosystems, in turn, are one of the suggested protective measures, where private keys periodically evolve in such a way that, if a break-in occurs, past uses of those keys in earlier periods are protected. At CCS 2001, Song argued why key exposures may cause even more important concerns in the context of group signatures (namely, under the mask of anonymity within a group of other key holders). She then gave two examples of forward-secure group signatures, and argued their ad hoc properties based on the state of understanding of group signature security properties at that time (proper security models had not been formalized yet). These implementations are fruitful initial efforts, but still suffer from certain imperfections. In the first scheme for instance, forward security is only guaranteed to signers as long as the group manager's private key is safe. Another scheme recently described by Nakanishi et al. for static groups also fails to maintain security when the group manager is compromised. In this paper, we reconsider the subject and first formalize the notion of "fully forward-secure group signature" (FS-GS) in dynamic groups. We carefully define the correctness and security properties that such a scheme ought to have. We then give a realization of the primitive with quite attractive features: constant-size signatures, constant cost of signing/verifying, and at most polylog complexity of other metrics. The scheme is further proven secure in the standard model (no random oracle idealization is used).
Starting Page	70
Ending Page	81
Page Count	12
File Format	PDF
ISBN	9781605589367
DOI	10.1145/1755688.1755698
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-04-13
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Forward security Key exposure Security modeling Group signatures Key protection Anonymity
Content Type	Text
Resource Type	Article

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