3. Secure Computation without Agreement

Shafi Goldwasser, Yehuda Lindell

Shafi Goldwasser, Yehuda Lindell

Albert Guan

Computationally lightweight and unconditionally secure key agreement protocols are very useful for secure communication in public networks. Recently, Guan et al. proposed a key agreement protocol whose security is based on the unpredictability of channel noise rather than computationally hard problems. These protocols are efficient, computationally lightweight, and unconditionally secure. However, authentication was not integrated into these protocols. In this article, we propose a new protocol with authentication capability that enables two nodes in the network to establish a secret session key for secure communication. It is more efficient, and it also preserves the lightweight and unconditional secure features of the key agreement protocols proposed by Guan et al. Therefore, it is more suitable for devices with limited computing power, such as sensors in Internet of Things (IoT).

Wei Da-wei

Group Key agreement allows multi users to establish a common session key though insecure channels.Designing secure group key agreement protocols is one of the most fundamental cryptographic tasks.This paper introduced two approaches developed for analyzing security group key agreement protocols:computational complexity approach and formal analysis approach.The key technologies of computational complexity approach were discussed,including the proof technology based on reduction and simulatability,and security models based on reduction and simulatability.The trends in this field were presented.

Silvio M. Micali, Phillip Rogaway

Junming Zhang

Secure Multiparty Computation protocol is an important area in cryptography.The research of multi-party computation was a subject of great importance in the international cryptographic circle.A key agreement scheme based on secure two-party computation is improved.Three schemes are proposed.It can be proved that even if Eve gets the same data as the receiver,the schemes are still secure.