An improvement of nonrepudiable threshold proxy signature scheme with known signers
نویسندگان
چکیده
Department of Computer Science and Information Engineering, National Central University, No. 300, Jung-da Road, Jung-li City, 320 Taoyuan, Taiwan, ROC Department of Management Information System, National Chung Hsing University, 250 Kuo Kuang Road, 402 Taichung, Taiwan, ROC Graduate Institute of Networking and Communication Engineering, Chaoyang University of Technology, 168 Gifeng E. Road, Wufeng, 413 Taichung County, Taiwan, ROC
منابع مشابه
A Secure Nonrepudiable Threshold Proxy Signature Scheme with Known Signers
In the (t, n) proxy signature scheme, the signature, originally signed by a signer, can be signed by t or more proxy signers out of a proxy group of n members. Recently, an efficient nonrepudiable threshold proxy signature scheme with known signers was proposed by H.-M. Sun. Sun’s scheme has two advantages. One is nonrepudiation. The proxy group cannot deny that having signed the proxy signatur...
متن کاملCryptanalysis of Two Nonrepudiable Threshold Proxy Signature Schemes
This paper will show that Hsu and Wu’s efficient nonrepudiable threshold proxy signature scheme with known signers and Yang, Tzeng and Hwang’s efficient nonrepudiable threshold proxy signature scheme with known signers are insecure. The malicious original signer can forge a valid threshold proxy signature for any message and any warrant after getting a valid proxy signature. In addition, since ...
متن کاملOn the Security of Some Nonrepudiable Threshold Proxy Signature Schemes
Abstract A (t, n) threshold proxy signature scheme enables an original signer to delegate the signature authority to a proxy group of n member such that t or more than t proxy signers can cooperatively sign messages on behalf of the original signer. In the paper, we review the security of some nonrepudiable threshold proxy signature schemes with known signers. We show that Sun’s threshold proxy...
متن کاملCryptanalysis of Nonrepudiable Threshold Proxy Signature Schemes with Known Signers
Sun’s nonrepudiation threshold proxy signature scheme is not secure against the collusion attack. In order to guard against the attack, Hwang et al. proposed another threshold proxy signature scheme. However, a new attack is proposed to work on both Hwang et al.’s and Sun’s schemes. By executing this attack, one proxy signer and the original signer can forge any valid proxy signature. Therefore...
متن کاملThreshold Proxy Signature Schemes
Delegation of rights is a common practice in the real world. Proxy signature schemes have been invented to delegate signing capability eeciently and transparently. In this paper, we present a new nonrepudiable proxy signature scheme. Nonrepudiation means the signature signers, both original and proxy signers, cannot falsely deny later that he generated a signature. In practice, it is important ...
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ورودعنوان ژورنال:
- Computers & Security
دوره 23 شماره
صفحات -
تاریخ انتشار 2004