A Provably Secure Certificate-Based Broadcast Encryption Scheme

LI Ji-guo; ZHANG Yi-chen; WEI Xiao-xia

doi:10.3969/j.issn.0372-2112.2016.05.013

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A Provably Secure Certificate-Based Broadcast Encryption Scheme

更新时间：2025-07-16

- A Provably Secure Certificate-Based Broadcast Encryption Scheme
- Acta Electronica Sinica Vol. 44, Issue 5, Pages: 1101-1110(2016)
- 作者机构：
  
  河海大学计算机与信息学院,江苏,南京,210098
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China (No.61272542);Fundamental Research Programs for the Central Universities (No.2013B07014)
- DOI：10.3969/j.issn.0372-2112.2016.05.013
  CLC： TP309
- Published Online：25 May 2016，
  
  Published：2016
- 稿件说明：
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LI Ji-guo, ZHANG Yi-chen, WEI Xiao-xia. A Provably Secure Certificate-Based Broadcast Encryption Scheme[J]. Acta Electronica Sinica, 2016, 44(5): 1101-1110.
DOI：

LI Ji-guo, ZHANG Yi-chen, WEI Xiao-xia. A Provably Secure Certificate-Based Broadcast Encryption Scheme[J]. Acta Electronica Sinica, 2016, 44(5): 1101-1110. DOI： 10.3969/j.issn.0372-2112.2016.05.013.

摘要

广播加密可使发送者选取任意用户集合进行广播加密

只有授权用户才能够解密密文.但是其安全性依赖广播中心产生和颁布群成员的解密密钥.针对这一问题

本文提出基于证书广播加密的概念

给出了基于证书广播加密的形式化定义和安全模型.结合基于证书公钥加密算法的思想

构造了一个高效的基于证书广播加密方案

并证明了方案的安全性.在方案中

用户私钥由用户自己选取

证书由认证中心产生

解密密钥由用户私钥和证书两部分组成

克服了密钥托管的问题.在方案中

广播加密算法中的双线性对运算可以进行预计算

仅在解密时做一次双线性对运算

提高了计算效率.

Abstract

Broadcast encryption allows a sender to securely broadcast to any subset of the group members.However

its security heavily depends on broadcast centre to generate and distribute decryption secret keys for group members.In order to solve the above problem

we propose the notion of certificate-based broadcast encryption

describe the formal definition and security model of the certificate-based broadcast encryption.Furthermore

we also provide an efficient certificate-based broadcast encryption scheme.In our scheme

the decryption key includes user's private key and a certificate

where the private key is chosen by user himself

and the certificate is generated by certification authority.Therefore

our scheme overcomes the key escrow problem.In addition

our scheme is efficient

because it needs only one paring in decryption algorithm and paring operation in encryption algorithm can be pre-computed.

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