The practise and study of encryption and decryption - encoding data so that it can only be decoded by specific individuals.
A system for encrypting and decrypting
data is a cryptosystem.
These usually involve an algorithm
for combining the original data ("plaintext") with one or
more "keys" - numbers or strings of characters known only to
the sender and/or recipient.
The resulting output iz known as "ciphertext".
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re: first thoughts
