Authenticated Group Key Exchange for Low-Resource Devices

• Main Authors: Chun-Chih Li, 李濬志
• Other Authors: Tzong-Chen Wu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/25gbjx

碩士 === 國立臺灣科技大學 === 資訊管理系 === 105 === With the advances in network communication, the application for Internet-connected devices increases gradually. Most connected devices in IoT are low-resource, so it becomes an important research topic in cryptography for secure group communications between low-resource devices nowadays. In a group communication for low-resource devices, authentication protocols with key exchange based on discrete algorithm are not suitable for low-resource devices due to computation limitation and require O(n^2) completion time for n devices. In this paper, we propose a computation-efficient authenticated group key exchange for low-resource devices. It only needs cross product operation, simple logic operations and arithmetic operations in implementation and reduces the completion time for n devices to O(log n). The proposed scheme satisfies some properties, such as identity authenticity, message confidentiality. When a device joins/leaves, the group key needs to be changed. The proposed key-updating method satisfies forward and backward secrecy.