PCM based audio signal security system

In the age of digital world, the issue of multimedia data security (such as digital audio signals, images, and videos) is a major concern due to the rapid development of digital communications and networking technologies. The available methods and algorithms to assure data protection are sincerely based on cryptography. To illustrate, the data protection methodology is inherently involved with the cryptographic primitives for secure data transmission and reception by assuming that both sides must trust on each other. Now, in the high time of modern communication technology, the range of cryptography has been drastically expanded after the development of communication means. Cryptography is essentially required to ensure data protection against penetrations and to prevent espionage. In this proposal, an illustrative conception on pulse code modulation (PCM) based audio signal encryption, undoubtedly a new technique of encryption, is given to provide a wider range of security. This very effective technique of encryption is applied in the original domain of the signal; so both encryption & decryption become much easily executable. In a brief, in this method, the audio signal samples will be encrypted using very common arithmetic algorithms & the total no of bits will be kept unaffected. So, the bandwidth required to transmit the encrypted signal will be as same as the original signal. In receiver section, the encrypted signal will be decrypted using exactly the reverse algorithm used earlier for encryption. The performance of this encryption scheme is very similar to the binary PCM system except that the audio samples are encrypted after sampling. The PCM based audio signal security system, thus, will ensure both the secure and better communication.