Decrypted Secrets: Methods and Maxims of Cryptology by Dr. rer. nat. Dr. ès sc. h.c. Dr. rer. nat. h.c. mult.

By Dr. rer. nat. Dr. ès sc. h.c. Dr. rer. nat. h.c. mult. Friedrich L. Bauer (auth.)

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4 Shannon. A cryptosystem where the encryption step is uniquely determined by a pair of plaintext and cryptotext characters may be called a Shannon cryptosystem. Many customary cryptosystems have this property. A cryptosystem where the encryption step and the decryption step coincide, and thus the crypto procedure is symmetrically determined, is called keysymmetric. In this case, every encryption step is involutory (cf. Sect. 1). 3 Encryption Steps: Simple Substitution Among the encryption steps we find prominently two large classes: substitution and transpositiono They are both special cases of the most general encryption step v

At the same time, the increasing use of public communications channels has led to authentication becoming as much a declared objective of cryptography as secrecy is (Sects. 6). 3 Cryptological techniques are occasionally used in literature. Intricately woven literary works such as Zettels Traum by Arno Schmidt (1970) just ask tobe 'decrypted'. Ostensibly secret messages represent a particular problern. ' L 'auteur pense que La Bruyere s 'est trompe. En effet: --- . " What then follows is a higgledypiggledy jumble of letters, as if a type-case had been spilt on the page.

1). Fig. 19. 2 The invention and financial exploitation of enciphering and deciphering machines is a lucrative branch of cryptography. Until the 19th century they were mechanical; from the beginning of the 20th century automation made its appearance, around the middle of the century came electronics and more recently microelectronic miniaturization. Towards the end of 1939, Konrad Zuse, the 30-year old Germancomputer pioneer, stationed as an infantryman on the SiegEried Line, also invented an enciphering machine, an attachment to a teleprinter.

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