Hard Cover. Condizione: Very Good. 508pp. Hardback with glossy boards, VG, owner name blindstamped on title page lower edge, figures and tables, "This is a collection of articles and papers that first appeared in 'Cryptologia', a journal dedicated to the studies associated with codes and ciphers.The articles discuss historical messages and mechanisms that help to send and understand secure messages. The intended audience appears to be those already familiar with various aspects of cryptology, the discipline of secure communications".