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학술지 A Note on an Identity-Based Ring Signature Scheme with Signer Verifiability
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저자
황정연
발행일
201103
출처
Theoretical Computer Science, v.412 no.8-10, pp.796-804
ISSN
0304-3975
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.tcs.2010.11.024
협약과제
10MS1900, 익명성 기반의 u지식정보보호기술 개발, 조현숙
초록
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.
키워드
Identity-based ring signature, Key recovery attack, Signer verifiability
KSP 제안 키워드
Key Recovery Attack, Security vulnerabilities, Signature scheme, identity-based, ring signatures, simple method