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By Thomas Beth (eds.)

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

Example text

U B O R G N E , US Army S i g n a l Corps, who introduced s t o c h a s t i c one-time keys i n 1918 on t h e b a s i s o f a VERNAH e n c r y p t i o n (which had been invented i n 1917 f o r t e l e t y p e machines by GILBERT S. VEFWAM). studied, among o t h e r s , by FRE IDMAN The p r o b a b i l i s t i c aspect o f t h e one-time key was who coined t h e word ' h o l o c r y p t i c ' , and by Claude E. SHANNONwho d e f i n e d ' p e r f e c t secrecy' i n l o o k i n g a t message and key as s t o c h a s t i c sources; i n f a c t SHA"ONS I n f o r m a t i o n Theory was motivated by h i s work.

A good source on c l a s s i c a l c r y p t o s r a p h i c nachines i s [Turkel 12271. eister 10261 and [ l e i s t e r 1SG21. A comprehensive h i s t o r i c a l p r e s e n t a t i o n o f c r y p t o l o g y w i t h a l l i t s i m p l i c a t i o n s has appeared w i t h [Kahn i9671. I t i s suppleqented f o r t o p i c s on World War I 1 by [Johnson 19781 and [Beesly 19771. dew m a t e r i a l from t h e other side i s found i n [Rohwer, JSckel 19791. A r a t h e r G a t h e m a t i c a l l y o r i e n t e d i n t r o d u c t i o n t o modern cryptocraphy i s [Konheim 15311, [geker, P i p e r 13321; t h e r e a r e several o t h e r books pending, [aenning 19321 has j u s t appeared.

Thus, some rather small n i s chosen and t h e stream of messages i s decomposed into segments of maximal length n , which a r e encrypted, transmitted and decrypted consecutively. In t h i s way, a : y(”)--+ W t m ) induces a correspondence a : v*-+ w * (I* i s not necessarily left-unique even i f Fano condition: No word from the range of of another word from the range. u u i s . A sufficient requirement is the may be beginning (or may be t h e end) 36 Very o f t e n , a l l words f r o m t h e range o f w" --+ ,(n) u : have equal length, a Then, t h e Fano c o n d i t i o n h o l d s t r i v i a l l y .

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