... ..4 EXTENDED RC4 CHIPHER ALGORITHM USING LFSR

摘要

The present invention is sufficiently long, and also weak and vulnerable to disadvantages of attack of the LFSR encryption method using the LFSR encryption method a short period according to the arrangement of the encryption key drawbacks of the RC4 encryption method, the encryption method of the secret key method RC4 encryption by safe and complement by the method relates to expand RC4 encryption method using the LFSR to perform high-speed operation of the encryption.; The method of the present invention with by defining the two-dimensional array of S- box having a total of 256 column lines with the same number of bytes, and the length of the plaintext data to be processed as one-time encryption, each row of the two-dimensional array, and initializing process to initialize the heat -1 linearly; By swapping the initialization on the basis of the column in each row of the S- boxes produced by the process -1 to pre-configure the data for a given encryption key randomly S- box rearrange -2 initialization process; With by defining the LFSR has a length equal to the length of the row of the S- boxes indicate the swapping of columns to each row in the box via the S- S_EOR generation process and the initialization process of initializing the LFSR -2 and also linear state counter (x) which linearly changes with and placed to define a random state counter (y) which randomly changes by a predetermined arithmetic expression, based on the linear state counter (x) and the random state counter (y) the same plaintext select a particular column of the S- box defined one-dimensional heat and, on the basis of the result of the random counter state (y) is said selected stored data, and inputs the determined state S_EOR column after determining the state of the S_EOR the operation with the measure comprises an encryption step of generating the encrypted statement.