Cryptography with unconditional security for the internet, commercial intranets, and data storage

摘要

In a pseudorandom coding cipher system and method, a sender generates a pseudorandom shift key using a pseudo-random number generator (PRNG) with seed and/or multiplier numbers from a one-time pad. A plaintext message is converted into a numerical synonym string, wherein the first number of the string is shifted with the shift key. The shift value is then passed through a one-way function to place the shift value in the range of numerical synonyms representative of the plaintext alphabet. This process is repeated until the entire numerical string has been shifted with a respective shift key and passed through the one-way function to produce a cryptogram. To decrypt, the reverse operation is performed to recover the plaintext message. Communications between the sender and a receiver is preferably performed according to a double-key lock box scenario employing double use of the above encryption and decryption methods making one-time pad distribution unnecessary.