Data encryption technique

摘要

A method of encrypting data is described in which a random variable (6A-6D) is generated in binary digital form. A first set of data (8A-8J) representing a plaintext message in binary digital form is combined with the random variable (6A-6D) to generate a second data set (9A-9J) in binary digital form. The data bits representing the random variable (6A-6D) are inserted into the second data set (9A-9J) according to a first predetermined set of rules and the order of the data bits in the second data set (9A-9J) is altered according to a second predetermined set of rules. A third data set (17A-17N) for transmission as a ciphertext message is thus generated.