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Journal Article A Note on an Identity-Based Ring Signature Scheme with Signer Verifiability
Cited 6 time in scopus Share share facebook twitter linkedin kakaostory
Authors
Jung Yeon Hwang
Issue Date
2011-03
Citation
Theoretical Computer Science, v.412, no.8-10, pp.796-804
ISSN
0304-3975
Publisher
Elsevier
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1016/j.tcs.2010.11.024
Abstract
Recently, Herranz presented an identity-based ring signature scheme featuring signer verifiability where a signer can prove that he or she is the real signer by releasing an authorship proof. In this paper we show that this scheme is vulnerable to a key recovery attack in which a user's secret signing key can be efficiently recovered through the use of two known ring signatures and their corresponding authorship proofs. In addition, we present a simple method to fix this security vulnerability by slightly modifying the authorship proof. Our modified scheme simplifies the original scheme and improves performance. To show that the modified scheme is unforgeable, we define two types of unforgeability notions for both signatures and authorship proofs. In these notions an adversary has opening capability to confirm the real signers of ring signatures and thus can manipulate authorship proofs in an adaptive way. We then prove that our modified scheme is secure in terms of these unforgeability notions. © 2010 Elsevier B.V. All rights reserved.
KSP Keywords
Key Recovery Attack, Ring signature, Security vulnerabilities, Signature scheme, identity-based, simple method