Paper 2007/225

On the Forgeability of Wang-Tang-Li's ID-Based Restrictive Partially Blind Signature

Shengli Liu, Xiaofeng Chen, and Fangguo Zhang

Abstract

Restrictive partially blind signature (RPBS) plays an important role in designing secure electronic cash system. Very recently, Wang, Tang and Li proposed a new ID-based restrictive partially blind signature (ID-RPBS) and gave the security proof. In this paper, we present a cryptanalysis of the scheme and show that the signature scheme does not satisfy the property of {\bf unforgeability} as claimed. More precisely, a user can forge a valid message-signature pair $(ID, msg, {\bf info'}, \sigma')$ instead of the original one $(ID, msg, {\bf info}, \sigma)$, where {\bf info} is the original common agreed information and ${\bf info}'\neq {\bf info}$. Therefore, it will be much dangerous if Wang-Tang-Li's ID-RPBS scheme is applied to the off-line electronic cash system. For example, a bank is supposed to issue an electronic coin (or bill) of \$100 to a user, while the user can change the denomination of the coin (bill) to any value, say \$100, 000, 000, at his will.

Note: This paper shows how to make a forgery of Wang restrictive partially blind signature.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
Unforgeabilityrestrictive partially blind signatureID-based cryptographyelectronic cash.
Contact author(s)
liu-sl @ cs sjtu edu cn
History
2007-06-19: received
Short URL
https://ia.cr/2007/225
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2007/225,
      author = {Shengli Liu and Xiaofeng Chen and Fangguo Zhang},
      title = {On the Forgeability of Wang-Tang-Li's ID-Based Restrictive Partially Blind Signature},
      howpublished = {Cryptology ePrint Archive, Paper 2007/225},
      year = {2007},
      note = {\url{https://eprint.iacr.org/2007/225}},
      url = {https://eprint.iacr.org/2007/225}
}
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