NDLI: Cryptanalysis and improvement of a certificateless partially blind signature

Content Provider	IET Digital Library
Author	Cheng, Lin Wen, Qiaoyan
Abstract	Partially blind signature is an important technique in secure electronic cash (e-cash) system. The first concrete certificateless partially blind signature (CLPBS) scheme for e-cash was constructed in 2011. Recently it was found that this construction had a security weakness and a rescued scheme was given. Unfortunately, the formal security proof was not given. In this study, the authors first give cryptanalysis of their rescued scheme. They demonstrate that a malicious user in their rescued scheme can forge a signature on any message by replacing the signer's public key. In an e-cash system, blind signatures issued by the bank are viewed as e-cash. Once they apply their scheme to an untraceable e-cash system, a malicious user can forge valid electronic coins (i.e. valid signatures) without being detected by the bank. It will result in loss of the bank. Then, they propose a newly improved CLPBS scheme which achieves the strongest security level and has higher computational efficiency than the rescued scheme published earlier. Finally, they give an example of potential application to e-cash systems using their scheme.
Starting Page	380
Ending Page	386
Page Count	7
ISSN	17518709
Volume Number	9
e-ISSN	17518717
Issue Number	Issue 6, Nov (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ifs/9/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ifs.2014.0293
Journal	IET Information Security
Publisher Date	2015-07-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Certificateless Partially Blind Signature Scheme CLPBS Scheme Cryptanalysis Cryptography Data Security Digital Signatures E-cash System Electronic Coins Electronic Money Financial Computing Formal Security Proof Public Key Cryptography Rescued Scheme Secure Electronic Cash System Security Weakness Signer Public Key
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Information Systems Software

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