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Cryptography is a key technology in electronic key systems. It is used to keep data secret, digitally sign documents, access control and other such areas. Therefore, users should not only know how its techniques work, but they must also be able to estimate its efficiency and security. Based on courses taught at Technical University in Darmstadt, Germany, this book explains the basic methods of modern cryptography. It is written for readers with only basic mathematical knowledge who are interested in modern cryptographic algorithms and their mathematical foundation. Several exercises are included following each chapter.