This book constitutes the thoroughly refereed post-conference proceedings of the 5th International Workshop, COSADE 2014, held in Paris, France, in April 2014. The 20 revised full papers presented together with two invited talks were carefully selected from 51 submissions and collect truly existing results in cryptographic engineering, from concepts to artifacts, from software to hardware, from attack to countermeasure.

A note on the use of margins to compare distinguishers.- A Theoretical Study of Kolmogorov-Smirnov Distinguishers: Side-Channel Analysis vs. Differential Cryptanalysis.- Pragmatism vs. Elegance: comparing two approaches to Simple Power Attacks on AES.- Addition with Blinded Operands.- On the Use of RSA Public Exponent to Improve Implementation Efficiency and Side-Channel Resistance.- Common Points on Elliptic Curves: The Achille's Heel of Fault Attack Countermeasures.- On Adaptive Bandwidth Selection for Efficient MIA.- Generic DPA attacks: curse or blessing?.- Template Attacks on Different Devices.- Using the Joint Distributions of a Cryptographic Function in Side Channel Analysis.- A Multiple-Fault Injection Attack by Adaptive Timing Control under Black-Box Conditions and a Countermeasure.- Adjusting laser injections for fully controlled faults.