Abstract
The Advanced Encryption Standard (AES) has been extensively used in many systems to provide security. However, many of the implementations are susceptible to Side Channel Attacks (SCA). To address the susceptibility, several researchers have proposed a number of countermeasures. Masking scheme is one of the countermeasures that are commonly used to counteract such attacks. In this paper, we investigate the overhead of the countermeasure in terms of execution time of the first order-masking scheme for the AES “Encryption part only”. To achieve that, we have implemented the sequential algorithm of the AES with single processor, and after that used OpenMP directives to reduce the overhead of the countermeasure. Subsequently, the result of the sequential algorithm has been compared with its parallel implementations using 2, 4, 6, and 8 processors. We show how parallel implementation of the AES offers better performance yet flexible enough for cryptographic algorithms. Compared to the sequential unmasked AES implementation, the best masking scheme for the first order using data parallelism shows a performance in terms of speed up around 5x when 8 threads are used.
Highlights
AES (Advanced Encryption Standard), referred to as Rijndael algorithm is classified as a symmetric key cryptography algorithm
We have implemented the sequential algorithm of the AES with single processor, and after that used OpenMP directives to reduce the overhead of the countermeasure
10 encryption rounds are for the 128 bits, 12 encryption rounds are for 192 bits and 14 encryption rounds are for 192 bits
Summary
AES (Advanced Encryption Standard), referred to as Rijndael algorithm is classified as a symmetric key cryptography algorithm. Many employments of cryptographic are susceptible to Side Channel Analysis (SCA) for instance power-analysis [3] [4] and timing attacks [5] [6], which exploit both power usage and timing during cryptographic operations in order to access the key. The main contribution of this paper is to work on the Sub-byte function of the AES algorithm to reduce this overhead. With this software implementation, we are going to reduce the cost of masking in terms of execution time by using OpenMP library [8].
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