International Association for Cryptologic Research

International Association
for Cryptologic Research


Songping Li


Towards Security Two-part Authenticated Key Agreement Protocols
Songping Li Quan Yuan Jin Li
We first present a new security 2-AK protocol, which is more secure and more efficient than previously proposed ones. Meanwhile, we point that Xie's ID-2-AK protocol modified from McCullagh-Barreto in CT-RSA 2005 doesn't provide protection against KCI attack likewise, and finally utilize the modular arithmetic, first proposed in MQV and also used in Kim, to get a modified new ID-2-AK protocol. On second thoughts, we give another ID-2-AK protocol utilizing the operation of addition in finite field like our forenamed 2-AK protocol. The two ID-2-AK protocols are in possession of all the desired security attributes. We also compare our new protocols with others in terms of computational cost and security properties.
A New Efficient ID-Based Authenticated Key Agreement Protocol
Quan Yuan Songping Li
Recently Eun-Kyung Ryu, Eun-Jun Yoon, and Kee-Young Yoo proposed an efficient ID-based authenticated key agreement with paring.They argued that it is secure and efficient. In this paper, we show this protocol is doesn't satisfy the Key-Compromise Impersonate property and it is not secure against key reveal attack. Then we propose our protocol from this protocol and shim's protocol, its security and efficiency was analyzed.


Jin Li (1)
Quan Yuan (2)