The cryptoclub: using mathematics to make and break secret codes
Sending messages with numbers. The study of breaking Caesar ciphers. Introduction to modular arithmetic. The process of cracking Vigenere ciphers when you know the key length. Letter frequencies in code. Using common factors to crack Vigenere ciphers.
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The Internet - a global association of computer networks. E-mail - system for sending messages between users. Guaranteeing the flow of information between customers, establishment of a virtual connection - the tasks of Transmission Control Protocol.
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