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Encryption & Decryption Functions.

Encryption function takes data (state/color in context of this blog), also known as plaintext message as first argument, and cryptographic key as second argument then produces ciphertext (encrypted, or disguised from being readable) message.

Decryption function takes ciphertext and cryptographic key as argument to reproduce original data (plaintext) from it.

A good encryption function makes it impossible to find the plaintext from the ciphertext without knowing the key.

See also: Basics of Cryptography (for everyone), More on Cryptography (Terminology).

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