%0 Journal Article
%T On Some Cryptographic Protocol
%A Foryś, Wit
%J Schedae Informaticae
%V 2021
%R 10.4467/20838476SI.21.001.14382
%N Volume 30
%P 9-15
%K cryptographic protocol, key-code, semi-commutativity set
%@ 1732-3916
%D 2021
%U https://ejournals.eu/en/journal/schedae-informaticae/article/on-some-cryptographic-protocol
%X 
	In this paper we present a cryptographic protocol for a seller - buyer problem and in particular we prove that non-emptiness of a semi-commutative set defined by mappings involved in the protocol is a decidable problem.