Sahun, A., V. Khaidurov, V. Lakhno, I. Opirskyy, V. Chubaievskyi, O. Kryvoruchko, and A. Desiatko. “Devising a Method for Improving Crypto Resistance of the Symmetric Block Cryptosystem RC5 Using Nonlinear Shift Functions”. Eastern-European Journal of Enterprise Technologies, vol. 5, no. 9 (113), Oct. 2021, pp. 17-29, doi:10.15587/1729-4061.2021.240344.