Difference between cipher and polyalphabetic

Definitions

noun

1. a quantity of no importance
2. a message written in a secret code
3. a mathematical element that when added to another number yields the same number
4. a person of no influence
5. a secret method of writing

verb

1. make a mathematical calculation or computation
2. convert ordinary language into code

Examples

Dated 196 B.C., the stone is engraved with Greek and hieroglyphic texts that enabled scholars to decipher ancient Egyptian writing.

He was one of the first 19th century sailors who tamed the seas through science, inventing systems for transporting cannon over marshy ground, ciphers for code and a system of hydrographical surveys.

The professor has deciphered the word 'Nesseta-ciled' by reversal: it is 'delicatessen' ...

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