A paper on the management and distribution of keys for EFT POS systems focuses on the use of a data-bearing card that precludes the need for secret data accessible through computer terminals as well as the use of digital signatures and negotiable documents in POS systems. Another paper explains how to simplify key management in EFT POS systems. Papers on data security describe the security system for the British Telecom SATSTREAM service and the Project UNIVERSE encryption experiment, which is designed to provide security for data transmissions. Three papers examine speech digitization techniques, compare the cryptographic requirements for digital secure speech systems operating at different bit rates, and review potential electromagnetic compatibility problems in the design of secure communication systems. Additional papers discuss a survey of encryption algorithms, multilevel knapsack encryption, practical primality testing and a practical fast exponentiation algorithm for a public key. Three papers deal with systems for controlling access to direct broadcasting systems limited to paying customers. Diagrams of the security systems and references are included.