| 摘要: |
| 目前在具有后向无关联性的本地验证撤销群签名方案中,公钥长度和时间间隔的总数线性相关,撤销列表的大小与时间间隔的总数和被撤销用户的总数线性相关.因此,当时间间隔总数和被撤销成员总数比较大时,所需的存储空间和撤销验证时的开支都比较高.在DTDH和q-SDH假设下,提出一种具有后向无关联性的本地验证撤销群签名方案,它具有较短公钥长度和撤销列表. |
| 关键词: 群签名 向后无关性 本地验证撤销 匿名性 可追踪性 |
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| 基金项目:Supported by the National Basic Research Program of China under Grant No.2007CB807902 (国家重点基础研究发展计划(973)); the National High-Tech Research and Development Plan of China under Grant No.2006AA01Z423 (国家高技术研究发展计划(863)) |
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| Backward Unlinkability and Verifier-Local Revocation Group Signature Scheme with Lower Cost |
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| Abstract: |
| In the current group signature schemes with backward unlinkability and verifier-local revocation (BU-VLR), the size of the public key is linear with the total number of time intervals, and the size of the revocation list (RL) is linear with the total number of time intervals and revoked members. Therefore, the cost is high not only in memory space but also in revocation token computation and revocation check. This paper proposes a BU-VLR group signature scheme under the DTDH assumption and the q-SDH assumption, which has short public key and RL to reduce the overheads in previous schemes. Moreover, it also has shorter signature length and smaller computation in signing. |
| Key words: group signature backward unlinkability verifier-local revocation anonymity traceability |
