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Abstract
Group signatures, which allow users of a group to anonymously produce signatures on behalf of the group, are an important cryptographic primitive for privacy-enhancing applications. Over the years, various approaches to enhanced anonymity management mechanisms, which extend the standard feature of opening of group signatures, have been proposed.
In this paper we show how pairing-based group signature schemes (PB-GSSs) following the sign-and-encrypt-and-prove (SEP) paradigm that are secure in the BSZ model can be generically transformed in order to support one particular enhanced anonymity management mechanism, i.e., we propose a transformation that turns every such PB-GSS into a PB-GSS with controllable linkability. Basically, this transformation replaces the public key encryption scheme used for identity escrow within a group signature scheme with a modified all-or-nothing public key encryption with equality tests scheme (denoted AoN-PKEET*) instantiated from the respective public key encryption scheme. Thereby, the respective trapdoor is given to the linking authority as a linking key. The appealing benefit of this approach in contrast to other anonymity management mechanisms (such as those provided by traceable signatures) is that controllable linkability can be added to PB-GSSs based on the SEP paradigm for free, i.e., it neither influences the signature size nor the computational costs for signers and verifiers in comparison to the scheme without this feature.
In this paper we show how pairing-based group signature schemes (PB-GSSs) following the sign-and-encrypt-and-prove (SEP) paradigm that are secure in the BSZ model can be generically transformed in order to support one particular enhanced anonymity management mechanism, i.e., we propose a transformation that turns every such PB-GSS into a PB-GSS with controllable linkability. Basically, this transformation replaces the public key encryption scheme used for identity escrow within a group signature scheme with a modified all-or-nothing public key encryption with equality tests scheme (denoted AoN-PKEET*) instantiated from the respective public key encryption scheme. Thereby, the respective trapdoor is given to the linking authority as a linking key. The appealing benefit of this approach in contrast to other anonymity management mechanisms (such as those provided by traceable signatures) is that controllable linkability can be added to PB-GSSs based on the SEP paradigm for free, i.e., it neither influences the signature size nor the computational costs for signers and verifiers in comparison to the scheme without this feature.
Original language | English |
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Title of host publication | 17th International Conference on Information Security, ISC 2014 |
Publisher | Springer Verlag |
Pages | 388-400 |
Volume | 8783 |
Edition | LNCS |
DOIs | |
Publication status | Published - 2014 |
Event | 17th International Conference on Information Security, ISC 2014, 12-14 October 2014, Hong Kong. (Full version Cryptology ePrint Archive Report 2014/607) - Hong Kong, China Duration: 12 Oct 2014 → 14 Oct 2014 |
Conference
Conference | 17th International Conference on Information Security, ISC 2014, 12-14 October 2014, Hong Kong. (Full version Cryptology ePrint Archive Report 2014/607) |
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Country/Territory | China |
City | Hong Kong |
Period | 12/10/14 → 14/10/14 |
Fields of Expertise
- Information, Communication & Computing
Treatment code (Nähere Zuordnung)
- Theoretical
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- 2 Finished
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EU - FutureID - Shaping the future of electronic identity
Rath, C., Hanser, C., Slamanig, D. & Lipp, P.
1/09/12 → 31/08/15
Project: Research project
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NewP@ass - New verification & valdidation methods enabling widespread use of Privacy and @nonymity in electronically secured systems
Röck, F., Unterluggauer, T., Könighofer, R., Mangard, S., Wenger, E., Spreitzer, R. C., Mendel, F., Schmidt, J. & Bloem, R.
1/05/12 → 31/05/15
Project: Research project