Group of the polymorphous modes of operation — PM

This article summarizes the actual results of our research in designing new group of polymorphous modes of operation for block ciphers. We have designed general scheme of block cipher polymorphous mode of operation based on pseudorandom number generator (PRNG) and function F. We have also designed the first polymorphous mode based on this scheme PM-DC-LM using the chaotic pseudo-random number generator (CPRNG), which is derived from deterministic chaos - Logistic maps. We have done some basic tests as a comparison with other commonly used block cipher modes of operation. We have also improved the first version of CPRNG and compared it by counting the entropies.