This book constitutes the thoroughly refereed post-proceedings of the Third International Conference on Security in Communication Networks, SCN 2002, held in Amalfi, Italy in September 2002. The 24 revised full papers presented together with two invited papers were carefully selected from 90 submissions during two rounds of reviewing and revision. The papers are organized in topical sections on forward security, foundations of cryptography, key management, cryptanalysis, systems security, digital signature schemes, zero knowledge, and information theory and secret sharing.

This book constitutes the proceedings of the 12th International Conference on Security and Cryptography for Networks, SCN 2020, held in Amalfi, Italy, in September 2020*.The 33 papers presented in this volume were carefully reviewed and selected from 87 submissions. They are organized in topical sections on blockchain; multiparty computation; oblivious RAM; primitives and constructions; signatures, encryption, and algebraic constructions; symmetric crypto; theory and lower bounds ; zero-knowledge. *The conference was held virtually due to the COVID-19 pandemic.