шифр цезаря - SERP Analysis

https://ru.wikipedia.org/wiki/%25D0%25A8%25D0%25B8%25D1%2584%25D1%2580_%25D0%25A6%25D0%25B5%25D0%25B7%25D0%25B0%25D1%2580%25D1%258F

https://planetcalc.ru/1434/

https://ciox.ru/caesar-cipher

https://stepik.org/lesson/352860/step/1%3Funit%3D336821

https://calculatorium.net/cryptography/caesar-cipher

https://dencode.com/ru/cipher/caesar

https://mmmf.msu.ru/archive/20152016/z4_Podgaits/03.html

https://www.reddit.com/r/learnpython/comments/16y4chs/caesar_cipher_basic/%3Ftl%3Dru

https://dzen.ru/a/X-_EJ68ULwsXHpjd

https://kmb.cybber.ru/crypto/caezar_cipher/main.html