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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L8. Coding system for car tires (14) manufacturer's codes: LM = factory; J3 = size; MEB = type; 344 = date (34th production week of 1974) There are some amusing stories about the supposed unbreakability of ciphers. Over-assessment of one's own cleverness is a regular source of advantage to the opposing side. Sometimes the exaggeration is the work of others. P. V. Jarozkij). And as late as 1917, the respected periodical Scientific American declared Vigenere's method (Sect. 4) tobe unbreakable. 28 2 Aims and Methods of Cryptography It was an ironic twist of fate that Etienne Bazeries, the great French cryptologist (1846- 1931), who shattered a whole series of supposedly unbreakable cryptosystems that had been presented to the French security agency, was hirnself presumptuous enough to believe he had found an absolutely secure method (je suis indechiffrable, see Fig.

The converse relation x- 1 : V* -+-- W*, defined by x -+-1 y if and only if x 1-+ y , is then called a decryption. 1 The intended recipient of an encrypted message should be able to reconstitute the original message without ambiguities. , unambiguous from right to left (left-univalent): (x 1-+ z) 1\ (y 1-+ z) =? (x = y) X We define 1ix = {y E W* : x 1-+ y} as the fiber of x E V* . As a rule it is also a requirement that the encryption X be total (definal); that is to say, 1ix is nonempty for all x E V* .

S. ) and therefore 3 Born Wolfe Friedmann in Kishinev (Moldavia) on Sep. 24, 1891. A. the following year. He died on Nov. 2, 1969 and was buried in Arlington. 30 2 Aims and Methods of Cryptography controlled by legislatives and executives. Post-war Germany has its Bundesnachrichtendienst (BND), directly answerable to the Chancellor's Office. The actual cryptological services, especially the departments for cryptanalysis, are frequently divided into diplomatic and military parts. That may have good organizational reasons, but it often hinders the exchange of experience.

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