METHOD AND DEVICE FOR GENERATING PSEUDORANDOM NUMBER, AND METHOD AND DEVICE FOR ENCRYPTION USING PSEUDORANDOM NUMBER

摘要

A method and a device for generating random numbers that reduce predictability and require less working memory capacity, as well as a method and a device for encrypting data for each specified capacity depending on generated pseudorandom numbers. New pseudorandom numbers are generated in such a method that seeds are divided into the specified number of blocks to determine the exclusive OR of the blocks different from each other, and the new blocks are linked with each other. In accordance with the pseudorandom numbers generated in such a method, data is encrypted for each specified capacity. At this time, the pseudorandom numbers are generated to use the specified amount of random numbers among the pseudorandom numbers used for previous encryption of the specified amount of data as the seeds for the next encryption.