One time pad tutorial

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11 Apr 2012 29 Apr 2014 I've put together a little tutorial on one-time pad ciphers. Without further ado: A one-time pad is the only (theoretically) 100% secure method of encryption currently available today. The one-time pad's security comes from it's key; the key (if chosen correctly) is EQUAL to the length of the plaintext and is 16 Apr 2008 Mathematically, the encryption and decryption functions can be described as follows: Say the sender wants to encode his plain text P - consisting of the letters P1 P2 P3Pn etc. - using the key b -- consisting of the letters b1 b2 b3bn etc. The sender first encodes plain letter P1 using the key letter b1, then P2 using b2, etc. That system is the one-time pad. A message encrypted using a one-time pad cannot be broken because the encryption key is a random number and because the key is used only once. A proven system. Intelligence agencies routinely use many different kinds of encryption systems – ranging from mechanical devices to 28 Jul 2012 Describes the One Time pad cipher. A classical encryption technique inspired by Vernam. The One Time Pad encryption method is a binary additive stream cipher, where a stream of truly random keys is generated and then combined with the plain text for encryption or with the ciphertext for decryption by an 'exclusive OR' (XOR) addition. It is possible to prove that a stream cipher encryption scheme is. 3 Jun 2012 19 Oct 2012