One-time-pad meaning

wŭntīm
A key used in private-key cryptography that is the same length as the contents of the message being encrypted, providing unbreakable encryption if the key is perfectly random and used only once.
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(cryptography) A form of encryption where each bit or character from the plaintext is encrypted by a modular addition with a bit or character from a secret random key (pad) of the same length as the plaintext.

One-time pads have been proven to be impossible to crack if used correctly.

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