Kalashnikov, V. V., Avramenko, V. V., Kalashnykova, N. I. and Kalashnikov, V. V. (2018) “A Cryptosystem Based Upon Sums of Key Functions”, International Journal of Combinatorial Optimization Problems and Informatics, 8(1), pp. 31-38. Available at: https://ijcopi.org/ojs/article/view/5 (Accessed: 6July2020).