摘要
The key exchange is a fundamental building block in the cryptography. Several provable security models for the key exchange protocol are proposed. To determine the exact properties required by the protocols, a single unified security model is essential, The eCK , eCK and CK models are examined and the result is proved that the eCK＇ model is the strongest provable security model for the key exchange. The relative security strength among these models is analyzed. To support the implication or non-implication relations among these models, the formal proofs and the counter-examples are given.
设计和分析双方密钥交换协议,目前已提出多个可证安全模型。为保障密钥交换协议所需的安全特性,形成一个统一的安全模型是非常必要的。本文评估了eCK′,eCK和CK模型,证明了eCK′模型是当前最强的密钥交换可证安全模型,并形式化分析了这些模型的强弱关系。此外,对于模型间存在的蕴含关系还提供了形式化证明,并对非蕴含关系给出了反例。
基金
Supported by the National High Technology Research and Development Program of China("863"Program)(2006AA706103)~~
