A novel scheme for hyperchaotic secure communication based on ring coupled RC oscillators is proposed. The presented scheme uses RC oscillator-based hyperchaotic signal generators and nonlinear ring couplers, from which information encryption and decryption can be realized. Basic dynamics behaviors are investigated, including bifurcation diagram and maximum Lyapunov exponents. Furthermore, by appropriate discrete processing and variable proportion transformation of continuous time systems, this approach is designed and implemented by digital signal processor (DSP) and its hardware experimental results are also given.