Cryptology and network security : 21st International Conference CANS 2022 Dubai United Arab Emirates November 13 16 2022 proceedings This book constitutes the refereed proceedings of the 21st International Conference on Cryptology and Network Security CANS 2022 which was held during November 13 16 2022. The conference was took place in Abu Dhabi United Arab Emirates.The 18 full and 2 short papers presented in these proceedings were carefully reviewed and selected from 54 submissions. They were organized in topical sections as follows: zero knowledge and MPC; public key infrastructure; attacks and countermeasures; cryptanalysis and provable security; cryptographic protocols; blockchain and payment systems; and codes and post quantum cryptography