Hyperchaotic systems have chaotic behavior with at least two positive Lyapunov exponents and the minimum required system dimension is four. In this paper, a 3D chaotic system is converted into hyperchaotic system using PI controller in the feedback path. Integral controller is responsible for increase in order of the system. The hyperchaotic nature is verified by the existence of two positive Lyapunov exponents and using bifurcation diagrams. The system is hyperchaotic in several different regions of the parameters. The result shows that this method can not only enhance or suppress chaotic behavior, but also induces chaos in non-chaotic parameter ranges. The proposed method is applied to a secure communication system by means of encryption and decryption of a message using hyperchaotic system.
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