Geodesic
On non-minimal perfect ciphers
Prikladnaya Diskretnaya Matematika. Supplement, no. 6 (2013), pp. 42-44.

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An analogue of Shannon's theorem is proved for non-endomorphic ciphers.
Keywords: perfect ciphers, non-endomorphic ciphers, maximal ciphers, non-minimal ciphers. 
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N. V. Medvedeva; S. S. Titov. On non-minimal perfect ciphers. Prikladnaya Diskretnaya Matematika. Supplement, no. 6 (2013), pp. 42-44. http://geodesic.mathdoc.fr/item/PDMA_2013_6_a21/

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