This two-volume set of LNCS 12146 and 12147 constitutes the refereed proceedings of the 18th International Conference on Applied Cryptography and Network Security, ACNS 2020, held in Rome, Italy, in October 2020.The conference was held virtually due to the COVID-19 pandemic. The 46 revised full papers presented were carefully reviewed and selected from 214 submissions. The papers were organized in topical sections named: cryptographic protocols cryptographic primitives, attacks on cryptographic primitives, encryption and signature, blockchain and cryptocurrency, secure multi-party computation, post-quantum cryptography.

This two-volume set of LNCS 12146 and 12147 constitutes the refereed proceedings of the 18th International Conference on Applied Cryptography and Network Security, ACNS 2020, held in Rome, Italy, in October 2020. The conference was held virtually due to the COVID-19 pandemic. The 46 revised full papers presented were carefully reviewed and selected from 214 submissions. The papers were organized in topical sections named: cryptographic protocols cryptographic primitives, attacks on cryptographic primitives, encryption and signature, blockchain and cryptocurrency, secure multi-party computation, post-quantum cryptography.

The perspective of a society with pervasive computing features is becoming a reality and is made possible by intelligent devices of the size of a grain of sand: tiny devices, with many different degree of miniaturization, power autonomy, communication capabilities, applications and last but not least costs. Such devices are resource constrained in memory storage, in computation power and in energy. Despite the appealing feature and the myriad of possible applications, the resource constrained nature of such devices, the wireless environment in which they operate, the broadcast way to communicate and their unattended use, expose them to many known threats, while traditional countermeasures cannot be adopted in the above mentioned technologies: RFID tags and sensor nodes cannot use asymmetric cryptography, tamper-proof solutions would increase the costs of such technologies, and so on. This book describes several protocols specifically designed to be employed in resource constrained devices, that try to hit the right balance between security objectives and security overheads.