It has also been proven that any cipher with the perfect secrecy property must use keys with effectively the same requirements as OTP keys. If the key is (1) truly random, (2) at least as long as the plaintext, (3) never reused in whole or in part, and (4) kept completely secret, then the resulting ciphertext will be impossible to decrypt or break. Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. In this technique, a plaintext is paired with a random secret key (also referred to as a one-time pad). ![]() ![]() In cryptography, the one-time pad ( OTP) is an encryption technique that cannot be cracked, but requires the use of a one-time pre-shared key the same size as, or longer than, the message being sent.
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