Trivium is a hardware oriented stream cipher finalist of the eSTREAM project. In this work, an optimized Differential Power Analysis (DPA) attack on Trivium using correlation shape distinguishers is presented. Unlike in the previous reported attacks, we are able to retrieve the whole 80-bit key without making any hypothesis during the attack using the proposed method. The theoretical vulnerability analysis is presented and then checked developing a simulation-based DPA attack on a standard CMOS Trivium implementation in a 90nm TSMC technology. The results show that our simulation-based attack is successful for random keys, improving the previously-reported attacks at least in 91.25% in terms of number of patterns needed to recover the key.
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