This book constitutes the refereed proceedings of the 15th International Workshop on Constructive Side-Channel Analysis and Secure Design, COSADE 2024, held in Gardanne, France, during April 9–10, 2024.

The 14 full papers included in this book were carefully reviewed and selected from 42 submissions. They were organized in topical sections as follows: Analyses and Tools; Attack Methods; Deep-Learning-Based Side-Channel Attacks; PUF/RNG; and Cryptographic Implementations.