Welcome to the resource topic for 2007/225
Title:
On the Forgeability of Wang-Tang-Li’s ID-Based Restrictive Partially Blind Signature
Authors: Shengli Liu, Xiaofeng Chen, 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.
ePrint: https://eprint.iacr.org/2007/225
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