Discusses how formal analysis of cryptographic protocols is very important for securing communication and processing information Introduces the reader to several formal verification methods and software commonly used today Covers general knowledge on cryptographic primitives and formal reasoning as basic blocks to understanding protocols Focuses on post-quantum cryptographic schemes Presents how this topic is significant in daily life such as online banking, instant messaging, etc.

This book constitutes the refereed proceedings of the 19th International Conference on Unity of Logic and Computation, CiE 2023, held in Batumi, Georgia, during July 24–28, 2023.  The 23 full papers and 13 invited papers included in this book were carefully reviewed and selected from 51 submissions. They were organized in topical sections as follows: ​Degree theory; Proof Theory; Computability; Algorithmic Randomness; Computational Complexity; Interactive proofs; and Combinatorial approaches.