Strumok stream cipher: Specification and basic properties

STRUMOK is a word-oriented additive stream cipher, where a word in the specification is chosen to be 64 bits. STRUMOK cipher uses some basic design principles from the stream cipher SNOW 2.0. STRUMOK aims at improving SNOW 2.0 both from the security and from the efficiency points of view. Most notably, it uses a more productive keystream generation procedure.