Modular Arithmatic and Cyphers

Modular arithmatic is like doing arithmatic on numbers on a clock, where the numbers wrap around at the edges.

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Cryptography

Codes and cyphers often make use of modular arithmatic, as well as it being essential to many cryptographic algorithms

Clocks

Calculating the time on a clock, as well as working with days, weeks, months, and years uses modular arithmatic.

Remainders

The modulus operator in programming languages finds the remainder when dividing two numbers.