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In this paper we introduce a new way to protect software implementation of cryptographic protocols against Side Channel Attacks (SCA) using Aspect Oriented Programming (AOP). For this purpose we have implemented the RSA algorithm in Java and our aspects with AspectJ. As a result, we show how AOP can help tremendously to enhance cryptographic protocols against SCA with nearly no negative side-effects. Moreover, we illustrate a new countermeasure against timing attacks aiming for the simple modular exponentiation technique. Our simulation performs a timing attack against the hamming weight of the secret key in a RSA cryptosystem. The success rate of the attack drops from 80% to 0% with our countermeasure.

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