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SUMMARYTseng et al. proposed two efficient authenticated encryption schemes with message linkages for message flows. Hwang et al. (IEICE Trans. Inf. and Syst., Vol. E89-D, No. 4, April 2006) presented a forgery attack against these two schemes and proposed an improvement that they claim resists such attacks. In this paper, we show that the improved authenticated encryption schemes proposed by Hwang et al. are not secure by presenting another message forgery attack against these improved schemes.

The Advanced Encryption Standard (AES) algorithm is a symmetric block cipher which operates on a sequence of blocks each consists of 128, 192

Nowadays, cloud computing has experienced remarkable growth. Indeed, one of the main challenges of cloud computing is to protect data from different sensor devices during processing and storing. In 2014, Henze et al. proposed the Sensor Cloud Security library (SCSlib) which allows cloud developer to access encrypted sensor data stored in the cloud. SCSLib drawback is that it allows a dishonest referee, dealing with a dispute, to decrypt all the future and past authenticated cipher-text between parties. In this study, we proposed an improved scheme for the SCSlib that prevent the users of the library from such attacks. In addition, the proposed scheme fulfils the following security requirements: Integrity, authenticity, confidentiality and availability. Moreover, security analysis in the cloudcomputing environment is presented.