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A Identity-based Broadcast Encryption Scheme for Protecting Recipient Private

ZHAO Yi,YANG Bo   

  1. (School of Computer Science,Shannxi Normal University,Xi’an 710119,China)
  • Received:2014-09-25 Online:2015-09-15 Published:2015-09-15

一种保护接收者隐私的IBBE方案

赵一,杨波   

  1. (陕西师范大学计算机科学学院,西安 710119)
  • 作者简介:赵一(1985-),男,硕士,主研方向:密码学,信息安全;杨波,教授、博士生导师。
  • 基金资助:

    国家自然科学基金资助项目“基于密文的安全多方计算”(61272436)。

Abstract:

Broadcast encryption has been widely used today.But most schemes do not pay much attention to privacy protection and the ones which claim to have the property of recipient privacy actually can not resist the replace attack from legal receivers.To solve the problem above,an identity based private broadcast encryption construction combining the techniques of key agreement and secret sharing is proposed.In the new scheme,the hash value of the ciphertext is necessary to decrypt so that the ciphertext can not be tampered.Thus new scheme can protect the recipient privacy not only from outside,but also from inside.That is,any legal receiver can not learn anything about the identities of other receivers.Analysis result shows that the construction is more advantageous in security level without increasing computation costs compared with existing schemes.

Key words: privacy protecting, Identity-based Broadcast Encryption(IBBE), key exchange, polynomial secret sharing, replace attack

摘要:

广播加密在现实中有广泛应用,但对于接收者隐私的保护方案仍然较少,且现存的能够保护隐私的方案多数不能抵御合法接收者的替换攻击。针对以上问题,结合密钥交换和秘密共享,提出一种新的基于身份的广播加密方案。接收者在解密时需要密文的哈希值作为解密密钥的一部分,使得密文不可修改,不仅能够保护接收者的隐私,而且能够成功抵御合法接收者集合内部的攻击,即任一合法接收者不能知道另外的接收者身份。分析结果表明,与同类方案相比,该方案在安全性上具有明显优势,且能保证效率性能。

关键词: 隐私保护, 基于身份的广播加密, 密钥交换, 多项式秘密共享, 替换攻击

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