Science of cyber security SciSec 2022 Workshops : AI CryptoSec TA BC NFT and MathSci Qsafe 2022 Matsue Japan August 10 12 2022 : revised selected papers This volume constitutes the papers of several workshops which were held in conjunction with the 4th International Conference on Science of Cyber Security Workshops SciSec 2022 held in Matsue Japan in August 10 12 2022. The 15 revised full papers and 3 posters were presented in this book were carefully reviewed and selected from 30 submissions.They were organized in topical sections as follows: AI Crypto and Security Workshop (AI CryptoSec); Theory and Application of Blockchain and NFT Workshop (TA BC NFT); and Mathematical Science of Quantum Safety and its Application Workshop (MathSci Qsafe)