抗自适应泄漏的基于身份加密方案

Identity-based encryption scheme against adaptive leakage

针对基于身份的加密(IBE)体制中缺乏有效抗自适应泄漏方案的问题,运用熵抗泄漏的基本思想,定义了自适应泄漏攻击下IBE的安全性;利用基于身份的散列证明系统(IB-HPS)和提取器,提出了抗自适应泄漏的IBE方案;并对其进行实例化,构建了基于q-TABDHE假设的抗自适应泄漏的IBE方案。安全性分析表明,设计的IBE方案是选择明文攻击安全的,它不仅能够有效地抵抗自适应泄漏,而且能够容忍较大的密钥泄漏量。

In allusion to the problem that scheme resilient to adaptive leakage was lacked in identity-based encryptionr a notion of entropic leakage-resilient was used to define the security against adaptive leakage in IBE. Then by using iden- tity-based hash proof system and extractors, an adaptive-leakage secure IBE scheme was proposed. And for instantiation, an IBE scheme against adaptive leakage based on q-TABDHE assumption was constructed. Security analysis shows that the scheme achieves chosen-plaintext attack security, and it can not only resist adaptive leakage effectively, but also tol- erate more key leakage.