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By Thomas Beth (eds.)

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Extra resources for Cryptography: Proceedings of the Workshop on Cryptography Burg Feuerstein, Germany, March 29–April 2, 1982

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These allowed to increase the size of the key family dramatically; in particular polyalphabetic polygraphic substitution could be used effectively. SOME REMARKS O N CRYPTANALYSIS There is neither room nor reason to discuss cryptanalysis here at length. However, a few remarks of general nature are appropriate i n order t o judge the use of cryptological methods. Monoalphabetic substitution offers no security, not even in the polygraphic case. This was already well known to ALEERTI (1466) and VIETE (1589).

The d e s i r e o f t h e c r y p t o l o g i s t , t o make i t n o t t o o easy f o r t h e enemy, f r e q u e n t l y l e a d s him t o d e v i s e c o m p l i c a t i o n s o f known methods. A c l a s s i c a l scheme i s t h e cornp o s i t i o n of methods. Sometimes t h i s does n o t h e l p : Double s u b s t i t u t i o n i s a s&s t i t u t i o n a g a i n ( t h e p e r i o d , however, may be l o n g e r ) , double t r a n s p o s i t i o n i s a g a i n a t r a n s p o s i t i o n .

He then conceived t h e c y l i n d e r which he now thought of a s being absolu- t e l y unbreakable: c>, see [Bazeries 19011. of the victims of BAZERIES, took revenge on BAZERIES. This brings us t o Rule Br. 2 : Only t h e cryptanalys' DE VIARIS, one can judge the s e c u r i t y of an encryption method. This finding, d a t i n g back t o PORTA and ANTOINE ROSSIGNOL (1599-1632), was formu- l a t e d by KERKHOFFS in 1883. He c r i t i z e d the way of demonstratin; the a n a l y t i c a l s e c u r i t y of a method by counting how many years i t would take t o r u n through a l l possible cases.

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