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Efficient Broadcast Encryption Scheme with Log-Key Storage

  • Yong Ho Hwang
  • Pil Joong Lee
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4107)

Abstract

In this paper, we present a broadcast encryption scheme with efficient transmission cost under the log-key restriction. Given n users and r revoked users, our scheme has the transmission cost of O(r) and requires the storage of O(logn) keys at each receiver. These are optimal complexities in broadcast encryptions using one-way hash functions (or pseudo-random generators.) To achieve these complexities, the stratified subset difference (SSD) scheme and the \(\overline{\textsf {B1}}\) scheme were introduced by Goodrich et al. and Hwang et al. respectively. However, their schemes have the disadvantage that transmission cost increases linearly according to the number of stratifications. By assigning the related keys between stratifications, our scheme remedies the defect and achieves very efficient transmission cost even in an environment where the key storage is restricted. To the best of our knowledge, our scheme has the most efficient transmission cost in the existing schemes with log-key storage. In addition, our result is comparable to other schemes that allow a large key storage.

Keywords

Computation Cost Transmission Cost Complete Scheme Broadcast Encryption Broadcast Encryption Scheme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Yong Ho Hwang
    • 1
  • Pil Joong Lee
    • 1
  1. 1.Dept. of Electronic and Electrical Eng.POSTECHPohangKorea

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