Aggregate Proxy Signature and Verifiably Encrypted Proxy Signature

  • Jin Li
  • Kwangjo Kim
  • Fangguo Zhang
  • Xiaofeng Chen
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4784)

Abstract

An aggregate signature is a single short string that convinces any verifier that, for all 1 ≤ i ≤ n, signer i signed message mi, where the n signers and n messages are distinct. The main motivation of aggregate signatures is compactness. In this paper, the concept of aggregate proxy signature (APS) is first proposed to compact the proxy signatures. Furthermore, a concrete APS scheme is constructed, which can be proved to be secure under the security model of APS. Additionally, as an application of APS, the concept of verifiably encrypted proxy signature (VEPS) is also first proposed in this paper, which can be used in contract signing. The VEPS allows the original signer to delegate another to sign the contract on its behalf. Finally, a VEPS construction is derived from the APS, which can be easily proved to be secure from the security of APS.

Keywords

Proxy signature Aggregate signature Random oracle Bilinear pairings 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Jin Li
    • 1
  • Kwangjo Kim
    • 1
  • Fangguo Zhang
    • 2
  • Xiaofeng Chen
    • 3
  1. 1.International Research center for Information Security (IRIS), Information and Communications University(ICU), 103-6 Munji-Dong, Yuseong-Gu, Daejeon, 305-732Korea
  2. 2.Department of Electronics and Communication Engineering, Sun Yat-Sen University, Guangzhou, 510275P.R. China
  3. 3.Department of Computer Science, Sun Yat-Sen University, Guangzhou, 510275P.R. China

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