Cryptology, for millennia a "secret science", is rapidly gaining in practical importance for the protection of communication channels, databases, and software. The second part deals with the process of covertly decrypting a secret code - cryptanalysis - where in particular advice on assessing methods is given.

Cryptography—The People.- Introductory Synopsis.- Aims and Methods of Cryptography.- Encryption Steps: Simple Substitution.- Encryption Steps: Polygraphic Substitution and Coding.- Encryption Steps: Linear Substitution.- Encryption Steps: Transposition.- Polyalphabetic Encryption: Families of Alphabets.- Polyalphabetic Encryption: Keys.- Composition of Classes of Methods.- Open Encryption Key Systems.- Encryption Security.- Cryptanalysis—The Machinery.- Exhausting Combinatorial Complexity.- Anatomy of Language: Patterns.- Polyalphabetic Case: Probable Words.- Anatomy of Language: Frequencies.- Kappa and Chi.- Periodicity Examination.- Alignment of Accompanying Alphabets.- Compromises.- Linear Basis Analysis.- Anagramming.- Concluding Remarks.

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 - cryptanaly-sis - 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. This 3rd edition has again been revised and extended in many technical and biographical details. "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 Fransen, International Intelligence History Study Group)

Reveals secrets and tells stories that will interest the general reader as well as the professional cryptologist The best single book on cryptology today" David Kahn, Cryptologia) Includes supplementary material: sn.pub/extras

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