Tamper Proof Reconfigurable Speech Encryption Engine

In this paper, Rossler’s attractor and the circular shifting method are used to create a hardware-based encryption scheme that can be changed to protect speech communication. In order to ratify the limitations of software-based speech encryption schemes like low throughput, being prone to attacks, poor quality in the deciphered signal, an inadequate key space, and high computational overhead. An enhanced reconfigurable hardware-based speech encryption architecture based on a three-dimensional Rossler’s attractor that offers high randomness through highly sensitive initial conditions and control parameters. The keys for the diffusion process are generated by Rossler’s attractor, and by using circular shifting, the scrambling has been achieved. The proposed speech encryption scheme is validated by conducting various analyses, such as histogram and spectrogram analyses, correlation analyses, signal-to-noise ratio analyses, and key space analyses. The obtained results show that the chosen approach is extremely safe, offers peer-to-peer encryption, and works well for real-time speech communication.