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An extension of the Shannon theory approach to cryptography

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1 Author(s)

Shannon's information-theoretic approach to cryptography is reviewed and extended. It is shown that Shannon's random cipher model is conservative in that a randomly chosen cipher is essentially the worst possible. This is in contrast with error-correcting codes where a randomly chosen code is essentially the best possible. The concepts of matching a cipher to a language and of the trade-off between local and global uncertainty are also developed.

Published in:

IEEE Transactions on Information Theory  (Volume:23 ,  Issue: 3 )