The date code

Article Abstract:

Instructions are provided for a secret code that changes each day of the year. To begin, each day's date is written in numbers and then placed over the word or phrase one wishes to encode. If the word is longer than the numbers, the numbers are simply repeated.

Cryptography, Ciphers

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Codemaster: the wheel code

Article Abstract:

A wheel code machine allows people to create and decode messages. The device was invented in the 1400s by Leon Battista Alberti and is comprised of two wheels of different sizes. The smaller wheel is turned to create messages in code and to decode messages.

Equipment and supplies

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The knot code

Article Abstract:

Instructions on tying knots in string to send messages in code are presented. The code uses two types of knots to represent the dots and dashes of the international Morse code.

Usage, Morse code

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