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Implicit and Explicit Certificates-Based Encryption Scheme

  • Tomasz Hyla
  • Witold Maćków
  • Jerzy Pejaś
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8838)

Abstract

Certificate-based encryption (CBE) combines traditional public-key encryption and certificateless encryption. However, it does suffer to the Denial of Decryption (DoD) attack called by Liu and Au. To capture this attack, they introduced a new paradigm called self-generated-certificate public key cryptography. In this paper we show that the problem of DoD attack can be solved with a new implicit and explicit certificates-based public key cryptography paradigm. More importantly, we propose a concrete implicit and explicit certificate-based encryption (IE-CBE) scheme that defends against DoD attack. This new scheme is enhanced version of CBE scheme and preserves all its advantages, i.e., every user is given by the trusted authority an implicit certificate as a part of a private key and generates his own secret key and corresponding public key. In addition, in the IE-CBE scheme trusted authority has to generate an explicit certificate for a user with some identity and a public key. We prove that our scheme is IND-CCA2 and DoD-Free secure in the random oracle model as hard is to solve p-BDHI and k-CCA problems.

Keywords

Pairing based cryptography implicit certificate explicit certificate encryption scheme random oracle model 

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Copyright information

© IFIP International Federation for Information Processing 2014

Authors and Affiliations

  • Tomasz Hyla
    • 1
  • Witold Maćków
    • 1
  • Jerzy Pejaś
    • 1
  1. 1.Faculty of Computer Science and Information TechnologyWest Pomeranian University of Technology, SzczecinPoland

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