Refazul Islam Refat

Work place: Dept. of Computer Science and Engineering, University of Dhaka, Dhaka, Bangladesh

E-mail: refazul.refat@gmail.com

Website:

Research Interests: Information Security, Network Security, Analysis of Algorithms, Mathematics of Computing, Theory of Computation, Models of Computation

Biography

Refazul Islam Refat received Bachelor of Science (BSc) in Computer Science and Engineering from the University of Dhaka, Bangladesh in 2015. His research interest includes Information Security, Internet of Things and Crypto Currency.

Author Articles
An Efficient Indexing Technique for AES Lookup Table to Prevent Side-Channel Cache-Timing Attack

By Refazul Islam Refat Euna Islam Mosaddek Khan

DOI: https://doi.org/10.5815/ijcnis.2018.09.03, Pub. Date: 8 Sep. 2018

In the era of virtualization, co-residency with unknown neighbours is a necessary evil and leakage of information through side-channels is an inevitable fact. Preventing this leakage of information through side-channels, while maintaining high efficiency, has become one of the most challenging parts of any implementation of the Advanced Encryption Standard (AES) that is based on the Rijndael Cipher. Exploiting the associative nature of the cache and susceptible memory access pattern, AES is proved to be vulnerable to side-channel cache-timing attacks. The reason of this vulnerability is primarily ascribed to the existence of correlation between the index Bytes of the State matrix and corresponding accessed memory blocks. In this paper, we idealized the model of cache-timing attack and proposed a way of breaking this correlation through the implementation of a Random Address Translator (RAT). The simplicity of the design architecture of RAT can make itself a good choice as a way of indexing the lookup tables for the implementers of the AES seeking resistance against side-channel cache-timing attacks.

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