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Comments on the security of Chen’s authenticated encryption scheme

✍ Scribed by Mohamed Rasslan; Amr Youssef

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
169 KB
Volume
37
Category
Article
ISSN
0045-7906

No coin nor oath required. For personal study only.

✦ Synopsis

Chen (Computers and Electrical Engineering, vol. 30, 2004) illustrated that Tseng et al.'s authenticated encryption schemes, with message linkages for message flows, do not achieve their claimed integrity and authenticity properties. Furthermore, Chen presented some modified schemes to repair these flaws. In this paper, we show that the modified schemes proposed by Chen are not secure. In particular, we present an attack that allows a dishonest referee, in case of a dispute, to decrypt all the future and past authenticated ciphertext between the contended parties. We also present a simple fix to prevent this attack.

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