Speech Files Cryptography using Indices Keys and Blocking

Protecting speech file is a vital issue. In this paper research a simple method of speech cryptography will be introduced. The method will use indices key to perform simple replacement operations to apply speech encryption and decryption, the replacement operation will use the indexes and the indexes contents to apply speech cryptography. The proposed method will protect the speech signal by increasing the security level, the method will use a color image as an image_key, this key will be kept in secret between the sender and receiver and it will be used to generate the indices key. The proposed will sensitive to the selected image_key, changing this image will be considered as a hacking attempt by producing a damaged decrypted speech signal. The proposed method will be flexible, changing the image_key will not cause any changes in the proposed method algorithms. To increase the efficiency of the proposed method by decreasing the processing time the speech file will be divided into blocks, and each block will be treated separately. The proposed method will be tested and implemented using various speech files, the obtained results will be used to prove the quality, sensitivity and efficiency of the proposed method.