Detailed analysis of the AES CTR mode parallel execution using OpenMP

The Advanced Encryption Standard (AES), also known as the Rijndael algorithm, is a symmetric bloc cipher approved by the NIST institute and used for the encryption of electronic data. Thanks to its high level of security, AES is one of the most popular and widely adopted algorithms likely to be encountered nowadays in cryptographic systems. This level of security is reached by the application of a multitude of complex mathematical transformations on the input data. Thus, it requires a large amount of execution time which may not be feasible for some real time applications. In this paper we propose the parallelization of AES algorithm in Counter mode. The OpenMP API was chosen to parallelize the sequential code. We present a detailed analysis of the obtained results in terms of execution time and speed-up measurements.