DocumentCode :
2427289
Title :
A Secure and Efficient Fault-Tolerant Group Key Agreement Protocol
Author :
Anmin Fu ; Gongxuan Zhang ; ZhenChao Zhu
Author_Institution :
Sch. of Comput. Sci. & Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China
fYear :
2013
fDate :
16-18 July 2013
Firstpage :
310
Lastpage :
314
Abstract :
A fault-tolerant group key agreement (GKA) protocol establishes a shared key among participants of a group even when some malicious participants disrupt key agreement processes. In 2010, Zhao et al. proposed a new efficient fault-tolerant GKA protocol, named EGKA, with lower computational cost and average communication cost than all previously fault-tolerant GKA protocols, and claimed the EGKA is resistant to passive and active attacks. Unfortunately, we show that the EGKA protocol seems not fault-tolerant in several non-trivial cases as it is vulnerable to the different key attack and the message tampering attack, in which an honest participant can be easily excluded from the set of participants. To remedy these security flaws, we propose an improved EGKA protocol, which covers all the identified weaknesses of Zhao et al.´s scheme and is still more efficient than the existing fault-tolerant GKA protocols.
Keywords :
cryptographic protocols; EGKA protocol; active attack; communication cost; computational cost; fault-tolerant GKA protocol; fault-tolerant group key agreement protocol; key attack; message tampering attack; passive attack; Computational efficiency; Conferences; Fault detection; Fault tolerance; Fault tolerant systems; Protocols; Security; Different key attack; Fault-tolerant; Group key agreement; Message tampering attack;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Trust, Security and Privacy in Computing and Communications (TrustCom), 2013 12th IEEE International Conference on
Conference_Location :
Melbourne, VIC
Type :
conf
DOI :
10.1109/TrustCom.2013.41
Filename :
6680856
Link To Document :
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