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# The main advantage of the one-time pad is that it is completely unbreakable

The one-time pad is famous as being the only completely unbreakable cipher. Assuming that the secret pad is randomly generated, not-reused (hence "one-time pad"), and not leaked, it is impossible to learn a single bit of the plaintext of a message from a ciphertext.

The one-time-pad is one of the best cryptography protocols when the work must be done by hand, without the aid of a computer. This made it important in the pre-computer era and is still useful in situations where possession of a computer is illegal or incriminating or where trustworthy computers are not available.

**The main advantage of the one-time pad is that it is completely unbreakable** if the one-time pad is random and only used once. Since it is equally probable that each bit of the one-time pad is a one or a zero, a zero or one in the ciphertext has an equal probability of being a zero or one in the plaintext.

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The one-time-pad is one of the best cryptography protocols when the work must be done by hand, without the aid of a computer. This made it important in the pre-computer era and is still useful in situations where possession of a computer is illegal or incriminating or where trustworthy computers are not available.

One-time pads are also practical in situations where two parties are in a secure environment, and they need to depart from one another and communicate from two separate secure environments with perfect secrecy.

In cryptography, the one-time pad (OTP) is a type of encryption, which has been proven to be impossible to crack if used correctly. Each bit or character from the plaintext is encrypted by a modular addition with a bit or character from a secret random key (or pad) of the same length as the plaintext, resulting in a ciphertext. If the key is truly random, as large as or greater than the plaintext, never reused in whole or part, and kept secret, the ciphertext will be impossible to decrypt or break without knowing the key. It has also been proven that any cipher with the perfect secrecy property must use keys with effectively the same requirements as OTP keys.[1] However, practical problems have prevented one-time pads from being widely used.