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we perform the exclusive-or of the ciphertext and the one-time pad, which gives us the original message. To encrypt the message using this pad, we exclusive-or each bit of the message with each bit of the one-time pad. The table below shows the binary encodings of each capital and lowercase letter and space.ĪSCII binary encodings of each capital and lowercase letter and space.
ONE TIME PAD SYSTEM CODE
A common method of encoding letters in binary is the America Standard Code for Information Interchange (ASCII) protocol. So, if you want to encrypt a one megabyte message and send it to someone, you need to securely share a one megabyte message with the intended recipient.Īs an example, let's encrypt the message ONETIME using a one-time pad. The secret in one-time pad encryption is a secret of the same length as the message to be encrypted. The exclusive-or of two identical bits (two zeros or two ones) produces a zero and the exclusive-or of two different bits (a zero and a one) produces a one. Encryption and decryption with the One-Time PadĮncryption with the one-time pad is based on the exclusive-or (XOR) operation. 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 one-time-pad is one of the best cryptography protocols when the work must be done by hand, without the aid of a computer.
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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 famous as being the only completely unbreakable cipher.