Results 71 to 80 of about 1,230 (176)

An efficient identity based strong designated verifier signature scheme

工程科学与技术, 2009
:To date, some identity based strong designated verifier signature schemes have been proposed, but there are some drawbacks on these schemes. To overcome the problem above, in this paper, a novel identity based strong designated verifier signature scheme
Li Ming-Xiang, Zheng Xue-Feng, Zhu Jian-Yong, Yan Peng   +3 more
doaj  

Blockchain Certificateless Encryption Mechanism Based on National Secret Algorithm [PDF]

Jisuanji kexue
The blockchain has attracted widespread attention because of its distributed,non-tamperable and inherent immutability features.However,the international cryptographic algorithm used in the blockchain has certain backdoor security risks.Based on the ...
XIANG Yanjie, HUANG Xiaofang, XIANG Kefeng, ZHENG Ji’nan
doaj   +1 more source

Security analysis and improvement of a certificateless signcryption scheme

Tongxin xuebao, 2015
To solve the certificate management problem in the traditional public key cryptography and the key escrow problem in the identity-based public key cryptography, Al-Riyami and Paterson proposed the concept of the certificateless public key cryptography ...
Zhen-guo ZHAO
doaj   +2 more sources

Analysis and Improvement on a Contributory Group Key Exchange Protocol Based on the Diffie-Hellman Technique

, 2012
[[abstract]]In 2008, based on the two-party Diffie-Hellman technique, Biswas proposed a contributory group key exchange protocol called the Group-DH protocol. This contributory property is an important one of group key agreement.
Tseng, Yuh-Min; WU, Tsu-Yang
core  

Machine-Checking Unforgeability Proofs for Signature Schemes with Tight Reductions to the Computational Diffie-Hellman Problem

, 2020
Digital signatures based on the Discrete Logarithm (DL) problem often suffer from long signature sizes, and reductions made loose by the use of Pointcheval and Stern's Forking Lemma.At EUROCRYPT 2003, Goh and Jarecki provided the first forking-free proof
Zain, Sara, Dupressoir, François
core  

Certificateless-based efficient aggregate signature scheme with universal designated verifier

Tongxin xuebao, 2015
The security model of the certificateless aggregate signature scheme with universal designated verifier was studied,and then a certificateless aggregate signature scheme with universal designated verifier using bilinear pairings was proposed.In the ...
Yu-lei ZHANG, Dong-rui ZHOU, Chen-yi LI, Yong-jie ZHANG, Cai-fen WANG   +4 more
doaj   +2 more sources

Discrete logarithm and Diffie-Hellman problems in identity black-box groups

, 2019
We investigate the computational complexity of the discrete logarithm, the computational Diffie-Hellman and the decisional Diffie-Hellman problems in some identity black-box groups G_{p,t}, where p is a prime number and t is a positive integer. These are
Santha, Miklos, Ivanyos, Gabor, Joux, Antoine   +2 more
core  

A new CCA-secure encryption based on the Gap Hashed Diffie-Hellman problem [PDF]

, 2013
This paper proposes a variant of the ElGamal public key encryption which is secure against chosen ciphertext attack. Our proof of security is based on the intractability of the Gap Hashed Diffie-Hellman assumption in the standard model.
Kamel Ariffin, Muhammad Rezal, Asbullah, Muhammad Asyraf   +1 more
core  

multi-authority Attribute-based Signature

工程科学与技术, 2011
:In real life, many attributes of a user are monitored by a single authority, which will inevitably increase its workload and reduce its efficiency. In this paper, the proposed multi-authority Attribute-based Signature scheme is that many attributes are ...
Sun Chang-Xia
doaj  

Efficient signature schemes with tight reductions to the Diffie-Hellman problems

, 2008
We propose and analyze two efficient signature schemes whose security is tightly related to the Diffie-Hellman problems in the random oracle model. Security of our first scheme relies on the hardness of the computational Diffie-Hellman problem; security ...
Jonathan Katz, Nan Wang, Eu-jin Goh
core