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Improved certificateless signature scheme provably secure in the standard model

Improved certificateless signature scheme provably secure in the standard model

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  • Author(s): Y. Yu 1, 2 ; Y. Mu 2 ; G. Wang 2 ; Q. Xia 1 ; B. Yang 3
    • View affiliations
    • Affiliations: 1: School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu, People's Republic of China
      2: Centre for Computer and Information Security Research, School of Computer Science and Software Engineering, University of Wollongong, Wollongong, Australia
      3: School of Computer Science, Shaanxi Normal University, Xi'an, People's Republic of China
  • Source: Volume 6, Issue 2, June 2012, p. 102 – 110
    DOI:  10.1049/iet-ifs.2011.0004 , Print ISSN 1751-8709, Online ISSN 1751-8717
© The Institution of Engineering and Technology
Published

Certificateless cryptography shares many features of identity-based cryptography and partially solves the problem of key escrow. Three certificateless signature schemes without random oracles were found in the literature. However, all the schemes suffer from some common drawbacks. First, by obtaining a signature on a message and replacing the public key of a signer, an adversary can forge valid signatures on the same message under the replaced public key. Secondly, all the schemes require a relatively large size of public parameters. The authors propose a new certificateless signature scheme, which exhibits an improvement on the existing schemes. Compared with the previous schemes, the proposed scheme offers stronger security, shorter system parameters and higher computational efficiency.

Inspec keywords: digital signatures; public key cryptography

Other keywords: key escrow; improved certificateless signature scheme; identity-based cryptography; public key; certificateless cryptography

Subjects: Cryptography; Data security

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