On the Joint Security of Encryption and Signature, Revisited

  • Kenneth G. Paterson
  • Jacob C. N. Schuldt
  • Martijn Stam
  • Susan Thomson
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7073)

Abstract

We revisit the topic of joint security for combined public key schemes, wherein a single keypair is used for both encryption and signature primitives in a secure manner. While breaking the principle of key separation, such schemes have attractive properties and are sometimes used in practice. We give a general construction for a combined public key scheme having joint security that uses IBE as a component and that works in the standard model. We provide a more efficient direct construction, also in the standard model.

Copyright information

© International Association for Cryptologic Research 2011

Authors and Affiliations

  • Kenneth G. Paterson
    • 1
  • Jacob C. N. Schuldt
    • 2
  • Martijn Stam
    • 3
  • Susan Thomson
    • 1
  1. 1.Royal Holloway, University of LondonUK
  2. 2.Research Center for Information Security, AISTJapan
  3. 3.University of BristolUK

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