https://rifco.ru/blog/2018/01/22/%d0%ba%d1%80%d0%b8%d0%bf%d1%82%d0%be%d0%bf%d1%80%d0%be%d0%b5%d0%ba%d1%82-%d1%83%d1%82%d0%be%d1%87%d0%bd%d0%b5%d0%bd%d0%b8%d0%b5-%d0%b7%d0%b0%d0%b4%d0%b0%d1%87%d0%b8/
Криптопроект: уточнение задачи