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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).

Computer security. --- Cryptography. --- Cryptanalysis --- Cryptology --- Secret writing --- Steganography --- Signs and symbols --- Symbolism --- Writing --- Ciphers --- Data encryption (Computer science) --- Computer privacy --- Computer system security --- Computer systems --- Computers --- Cyber security --- Cybersecurity --- Electronic digital computers --- Protection of computer systems --- Security of computer systems --- Data protection --- Security systems --- Hacking --- Protection --- Security measures --- Data encryption (Computer science). --- Coding theory. --- Number theory. --- Computer science. --- Mathematics. --- Cryptology. --- Coding and Information Theory. --- Number Theory. --- Computers and Society. --- Applications of Mathematics. --- Informatics --- Science --- Number study --- Numbers, Theory of --- Algebra --- Data compression (Telecommunication) --- Digital electronics --- Information theory --- Machine theory --- Signal theory (Telecommunication) --- Computer programming --- Data encoding (Computer science) --- Encryption of data (Computer science) --- Computer security --- Cryptography --- Math --- Information theory. --- Computers and civilization. --- Applied mathematics. --- Engineering mathematics. --- Engineering --- Engineering analysis --- Mathematical analysis --- Civilization and computers --- Civilization --- Communication theory --- Communication --- Cybernetics --- Mathematics