download0 view119
twitter facebook

공공누리This item is licensed Korea Open Government License

Title
An enhanced (t,n) threshold directed signature scheme
Author(s)
황정연송보연
Publication Year
2014-02-19
Abstract
A directed signature scheme is devised to achieve directivity for verification such that only a designated verifier can check the validity of a signature and, in times of trouble, any third party can verify the signature with the help of the signer or the designated verifier. A threshold directed signature scheme distributes responsibility and authority for generating a directed signature to several users via a threshold mechanism. Lu et al. recently proposed a novel (t,n)(t,n) threshold directed signature scheme. In this paper, we show that the scheme is vulnerable to a rogue-key attack which is mounted by an adversary who can arbitrarily select his or her public key. Through the rogue-key attack, the adversary can forge a signature on any message for a set of signers. In order to thwart such a rogue-key attack, we propose an enhanced (t,n)(t,n) threshold directed signature scheme with a reliable key registration protocol. The protocol guarantees that a user should have access to the secret key corresponding to the user’s public key. Under the computational Diffie-Hellman assumption, we prove that the improved scheme is secure, that is, it achieves existential unforgeability under the chosen message attack, invisibility, and transitivity in the registered key model. We stress that the security of our improved scheme does not depend on a specific broadcast channel for synchronous message transmission.
Journal Title
Information Sciences
ISSN
0020-0255
Files in This Item:
There are no files associated with this item.
Appears in Collections:
7. KISTI 연구성과 > 학술지 발표논문
URI
https://repository.kisti.re.kr/handle/10580/14282
Export
RIS (EndNote)
XLS (Excel)
XML

Browse