Search for Secure Random 8-bit Generator by Modular Approach of Statistical Test
J KMSadiqueUzZamanandRanjanGhosh · International Journal of Computer Applications · 2014
Random key bit generators are used in statistically secured stream ciphers.In stream ciphers pseudorandom key bits are XORed with non-random text bits to generate random cipher bits.In practice, it is impossible to get a Random Bit Generator (RBG) that can be used for encryption as well as for decryption.The solution is to search for a suitable Pseudo Random Bit Generator (PRBG).In this paper, a comparative study of randomness of RC4 is made with that of six set of pseudorandom 8-bit sequences generated by introducing some variations in BBS and PM algorithms.In RC4, the given key randomizes an 8-bit identity S-Box in 256 rounds.The BBS and PM require an initial seed to be given as key.In the study, one algorithm generates 167800 pseudorandom 8-bit key sequences for a given key.For each of the seven sets, 300 such sequences are generated using 300 different given keys.The randomness of 300 sequences for each set are tested using three test modules.