Mathematics in Cybersecurity on Stepik (Kaspersky Academy)
Course in Russian for school students in grades 9-11 and first- and second-year university and college students. Shows how combinatorics, arithmetic and Boolean algebra are used in cryptography, a real area of information security. Created by specialists from Kaspersky: 23 lessons, about 15 hours (2-3 hours a week). Free and open at any time.
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