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›› 2010, Vol. 27 ›› Issue (1): 90-106.DOI: 10.7523/j.issn.2095-6134.2010.1.013

• Research Articles • Previous Articles     Next Articles

Key privacy in multi-recipient setting and shortened private broadcast encryption

ZHANG Hai-Bin1,2, WU Chuan-Kun, WEI Ling-Bo1,2   

  1. 1. State Key Laboratory of Information Security,Institute of Software of the Chinese Academy of Sciences,Beijing 100190,China;
    2. Graduate University of the Chinese Academy of Sciences, Beijing 100190, China
  • Received:2009-03-02 Revised:2009-04-27 Online:2010-01-15
  • Supported by:

    supported by the National Grand Fundamental Research 973 Program of China(2007CB807902) and the National High-Tech Research and Development Plan of China(2006AA01Z423) 

Abstract:

In this paper, we formally built the security models on key privacy in the multi-recipient and randomness re-using multi-recipient setting and proved their security. Two associated reproducibility tests concerning key privacy were proposed. Based on these results, we constructed a general shortened private broadcast encryption scheme which approximately halves ciphertext overhead and computational cost.

Key words: key privacy, randomness, multi-recipient, broadcast encryption, private broadcast encryption

CLC Number: