Today cryptography is an integral part of our lives. PRNG's are used in modern cryptography. The maximal length PN-sequence (m-sequence) is the best known best-described PN-sequence whose length is equal to its period. Various PN-codes can be generated using Linear Feedback Shift Register (LFSR). The generator polynomial provides the necessary feedback taps for the LFSR circuit. The implementation of the LFSR circuit with VLSI technology makes it useful in low-power communication system design. This paper presents the performance comparison of 4 bit LFSR method with BBS and the reported results show that LFSR is more suitable for cryptographic application. © 2014 IEEE.