A Review on Cryptographic Algorithms for Speech Signal Security

Abstract The most common way of human communication is accomplished by speech. There are situations when secret messages have to be sent. Transmission of speech signals over internet encounters the risk of eavesdropping. Cryptographic algorithms support in securing the voice signals by scrambling techniques. Many scrambling techniques are available for securing the speech signal. The encryption / decryption technique should provide high level of security to the signal and recover the original signals quickly and efficiently yet maintaining excellent audio quality. Few methods to protect the signal from outsiders are discussed and their performances are analyzed. This review report is presented to provide aid for selecting the best cryptographic algorithm to ensure speech signal security during transmission.