TY  - JOUR
AU  - S. M. Ratseev
TI  - Conditions for the existence of perfect ciphers with a~fixed set of parameters
JO  - Prikladnaya Diskretnaya Matematika. Supplement
PY  - 2014
SP  - 54
EP  - 56
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PDMA_2014_7_a23/
LA  - ru
ID  - PDMA_2014_7_a23
ER  -