Field Programming Oriented Secured Speech Communication Using Watermark With Multiple Domain Analysis

This paper presents a FPGA (Field Programmable Gate Array) based speech signal communication system. The system consists of encryption and watermarking. To facilitate fast operation and reduced data size, the sampled signal is compressed before operation. There are many encryption techniques available for encryption. But for real-time signal encryption, fast encryption is necessary. Watermark provides more secured authentication and ownership verification. As random numbers are used for the encryption process, the signal is secured for both wired and wireless media. FPGA is an efficient device for these operations on real-time signals. Conventional processors contain small number of registers and perform large operations in multiple cycles. FPGA can perform a large number of operations at a time.