On the security of some proxy blind signature schemes

Authors:
Hung-Min Sun;Bin-Tsan Hsieh;Shin-Mu Tseng
Affiliations:
Department of Computer Science, National Tsing Hua University, 101, Sec 2, Kuang-Fu Rd., Hsinchu 30055, Taiwan;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan 701, Taiwan;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan 701, Taiwan
Venue:
Journal of Systems and Software
Year:
2005

Citing 6
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Abstract

A proxy blind signature scheme is a digital signature scheme which combines the properties of proxy signature and blind signature schemes. Recently, Tan et al. proposed two proxy blind signature schemes based on DLP and ECDLP respectively. Later, compared with Tan et al.'s scheme, Lal and Awasthi further proposed a more efficient proxy blind signature scheme. In this paper, we show that both Tan et al.'s schemes do not satisfy the unforgeability and unlinkability properties. Moreover, we also point out that Lal and Awasthi's scheme does not possess the unlinkability property either.