Book excerpt: The volume constitutes the proceedings of the 23rd International Conference on Cryptology, INDOCRYPT 2022, which was held during December 11–14, 2022. The conference took place in Kolkata, India.The 31 full papers included in this book were carefully reviewed and selected from 74 submissions. They were organized in topical sections as follows: symmetric key cryptology;protocols and implementation;cryptanalysis;boolean functions;quantum cryptography and cryptanalysis;post quantum cryptography