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one time pad (OTP)

The One-Time-Pad (OTP) method is an encryption method that uses a key only once. This key consists of a random number and must have the same length as the plaintext

.With the one-time-pad method, the key is combined with the plaintext in an XOR operation

. The result leads to a random sequence. The on-time pad, whose underlying encryption

method Lucifer was developed by IBM as early as 1974, is very costly because it requires an equal amount of keys as of transmitted data.

However, it is also very secure, since statistical analyses are not possible; provided that the keys are purely random and are only used once.

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Englisch: one time pad - OTP
Updated at: 04.03.2008
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