Efficient WPT Based Speech Signal Protection

Abstract

Speech files are now widely circulated using various means of communication, and sometimes the speech file can be secret, which requires protecting it from any unauthorized person to hear and understand it. The methods which use DES standard for data encryption-decryption are considered ineffective because they need a long time to implement the protection of speech files due to their large size and containing double data with fractions. In this paper research a method which uses WPT decomposition will be proposed, tested and implemented. It will be shown how the new introduced method will increase the cryptography process efficiency by minimizing the encryption-decryption times keeping at the same time excellent values for quality parameters.