Analysis and Improvement of a Secret Broadcast with Binding Encryption in Broadcasting Networks

Mingwu ZHANG  Fagen LI  Tsuyoshi TAKAGI  

IEICE TRANSACTIONS on Information and Systems   Vol.E95-D   No.2   pp.686-689
Publication Date: 2012/02/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E95.D.686
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Information Network
secret broadcast,  binding encryption,  public key,  decryption consistency,  

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A secret broadcasting scheme deals with secure transmission of a message so that more than one privileged receiver can decrypt it. Jeong et al. proposed an efficient secret broadcast scheme using binding encryption to obtain the security properties of IND-CPA semantic security and decryption consistency. Thereafter, Wu et al. showed that the Jeong et al.'s scheme just achieves consistency in relatively weak condition and is also inefficient, and they constructed a more efficient scheme to improve the security. In this letter, we demonstrate that the Wu et al.'s scheme is also a weak decryption consistency and cannot achieve the decryption consistency if an adversary has the ability to tamper with the ciphertext. We also present an improved and more efficient secret broadcast scheme to remedy the weakness. The proposed scheme achieves decryption consistency and IND-CCA security, which can protect against stronger adversary's attacks and allows us to broadcast a digital message securely.