International Journal of Engineering and Technology

Orthogonal Frequency Division Multiplexing (OFDM), in the recent past is being preferably used in wireless communication because of its high data rate and its unique property of the transmitted symbols being mathematically orthogonal. This mathematical orthogonality allows signals with different frequencies to propagate in the same subcarrier unlike traditional Frequency Division Multiplexing Technique (FDM) where each piece of information is propagated with a single carrier which saves the additional guard period there by giving robustness to the system from impairments due to frequency fading caused by multipath propagation and Inter Symbol Interference(ISI). Through this paper it was inferred that adding security and authenticity(encryption) followed cons though there were considerable amount of pros. Secured Hash Algorithm(SHA 1) conceals the data by furnishing an unrecognizable distinct hundred and sixty bits digest. This gave rise to reliable protection but eventuated increased Bit Error Rate(BER) . The 160 bits hash sequences contributes to larger bit error rate emanating from the fact that greater number of bits results in greater probability of BER.