This book is the proceedings of CRYPTO '87, one in a series of annual conferences devoted to cryptologic research. CRYPTO '87 was attended by 170 people representing 19 countries. The papers in this volume are presented in seven sections. The first six sections comprise all of the papers on the regular program, including two papers that were not presented at the meeting. The seventh section contains some of the papers presented at a Rump Session. The main sections deal with the following topics: communication networks and standards; protocols; key distribution systems; public key systems; design and analysis of cryptographic systems; and applications.