Design and analysis of certificate-free undeniable signature schemes


Behna, Rouzbeh (2013) Design and analysis of certificate-free undeniable signature schemes. Masters thesis, Multimedia University.

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The main focus of this thesis is on the design and analysis of undeniable signature schemes in certificate-free settings, namely, identity-based setting and certificateless setting. Undeniable signature is a special type of digital signatures which is not universally verifiable. Identity-based cryptography overcomes the costly issues in traditional public key cryptography by computing the users’ public keys directly from their publicly available information. However, identity-based systems suffer from an inherent private key escrow problem. Certificateless cryptography was later proposed to bridge between identity-based cryptography and traditional public key cryptography by eliminating the use of certificates while addressing the private key escrow problem at the same time. Firstly, two attacks are mounted on an efficient identity-based undeniable signature scheme. A provably secure and efficient identity-based undeniable signature scheme with short signature is then proposed. Secondly, cryptanalysis is presented on a newly proposed efficient certificateless undeniable signature scheme. More precisely, security flaws are found on the invisibility and non-impersonation properties of the scheme. A revised scheme is then proffered which tackles both of the attacks while enjoys from an equally efficient Sign algorithm. Independently, a provably secure certificateless undeniable signature scheme which is more efficient than the only existing scheme that is secure in the strong security model is proposed. Lastly, in our effort in proposing certificateless undeniable signature schemes with additional features, the security model of convertible certificateless undeniable signature schemes is formally defined and an instance of such schemes is presented for the first time.

Item Type: Thesis (Masters)
Additional Information: Call No.: QA76.9.A25 R68 2013
Subjects: Q Science > QA Mathematics > QA71-90 Instruments and machines > QA75.5-76.95 Electronic computers. Computer science > QA76.75-76.765 Computer software
Divisions: Faculty of Information Science and Technology (FIST)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 22 Apr 2014 07:13
Last Modified: 22 Apr 2014 07:13


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