Geodesic
Conditions for the existence of perfect ciphers with a~fixed set of parameters
Prikladnaya Diskretnaya Matematika. Supplement, no. 7 (2014), pp. 54-56

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Some necessary and sufficient conditions for existence of a perfect cipher with the given sets of plaintexts and keys and a key probability distribution are presented.
Keywords: cipher, perfect cipher. 
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     author = {S. M. Ratseev},
     title = {Conditions for the existence of perfect ciphers with a~fixed set of parameters},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {54--56},
     publisher = {mathdoc},
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     year = {2014},
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     url = {http://geodesic.mathdoc.fr/item/PDMA_2014_7_a23/}
}
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S. M. Ratseev. Conditions for the existence of perfect ciphers with a~fixed set of parameters. Prikladnaya Diskretnaya Matematika. Supplement, no. 7 (2014), pp. 54-56. http://geodesic.mathdoc.fr/item/PDMA_2014_7_a23/