one-time pad

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one-time pad

(wŭn′tīm′)
n.
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.
References in periodicals archive ?
Now, if we use the same cryptographic key in onetime pad cipher for different real iris codes of the same individual, we may reveal information about noise but the ideal iris code remains encrypted.
With a onetime pad, there are as many bits in the key as in the plaintext.