Cryptology, for millennia a "secret science", is rapidly gaining in practical importance for the protection of communication channels, databases, and software. Beside its role in computerized information systems (public key systems), more and more applications within computer systems and networks are appearing, which also extend to access rights and source file protection. The first part of this book treats secret codes and their uses - cryptography. The second part deals with the process of covertly decrypting a secret code - cryptanalysis - where in particular advice on assessing methods is given. The book presupposes only elementary mathematical knowledge. Spiced with a wealth of exciting, amusing, and sometimes personal stories from the history of cryptology, it will also interest general readers. Decrypted Secrets has become a standard book on cryptology. The new edition has been revised and extended in many details, particularly on the ENIGMA and other rotor machines, on cipher teletype machines, codenamed FISH by the British, and on key negotiation. "The best single book on cryptology today" (David Kahn, Cryptologia) "For those who work actively with cryptology this book is a must. For amateurs it is an important dictionary which in many cases will guide them to make their ciphers more secure." (Arne Fransén, International Intelligence History Study Group)