基于身份的抗私钥泄漏的广播加密方案

IDENTITY-BASED BROADCAST ENCRYPTION WITH ANTI PRIVATE KEY LEAKAGE

侧信道攻击引起密码系统的部分信息泄漏,破坏很多密码方案的安全性。在基于身份的广播加密方案(IBBE)中,到目前为止,还没有能抵抗侧信道攻击的安全方案。基于此,提出一个抗侧信道攻击安全的基于身份的广播加密方案。使用双系统加密技术,在复合阶群静态假设下在标准模型中证明了提出方案的安全性。泄漏性能分析表明,私钥的相对泄漏率可以达到1/3。该方案具有较好的抗私钥泄漏性能。

The side channel attack causes information leakage of cryptosystems,and it also destroys the security of many cryptographic schemes. There is no security scheme can resist side channel attack in identity-based broadcast encryption( IBBE). In this paper,we propose an IBBE scheme against side channel attack. The scheme uses dual system encryption technology,and we prove the safety of the proposed scheme in the standard model based on composite order bilinear group assumptions. Leakage performance analysis shows that the private key of the relative leakage rate can reach 1 /3. The scheme has good performance of anti-private key leak.