Cryptography is a book written by Andre Langie and first published in 1922. It is a comprehensive guide to the science of cryptography, which involves the study of techniques for secure communication in the presence of third-party eavesdroppers. The book covers a range of topics related to cryptography, including classical ciphers, modern ciphers, and cryptanalysis. It also explores the history of cryptography, including its use in ancient civilizations, and its role in modern conflicts and espionage. The book is written in a clear and concise style, making it accessible to readers with a basic understanding of mathematics and computer science. Cryptography is a valuable resource for anyone interested in the field of cryptography, including students, researchers, and professionals.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.