Speech signal compression and encryption based on sudoku, fuzzy C-means and threefish cipher

<span lang="EN-US">Compression and encryption of speech signals are essential multimedia technologies. In the field speech, these technologies needed to meet security confidentiality information requirements for transferring huge via a network, decreasing storage space rapid retrieval. this paper, we propose an algorithm that includes hybrid transformation in order analyses signal frequencies. The is then compressed, after removing low less intense frequencies, produce well compressed ensure quality speech. resulting used as input scrambling was proposed on two levels. One external scramble works mixing up segments were divided using Fuzzy C-Means changing their locations. internal scatters values each block internally based pattern Sudoku puzzle quadratic map so threefish algorithm. proved be highly efficient compression approved statistical measures.</span>