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based on chaotic systems is developed in this paper. The main goal of this paper is to increase the security of a chaotic crypto system especially against known plaintext and chosen plaintext attacks by coupling two chaotic systems, the Hénon map used to generate the chaotic sequence and the logistic map to control a multiplexer that outputs is x(k) or x(k-1) of the Hénon system according to the value generated by the logistic map. In order to generate a strong pseudo random sequence, the output of the multiplexer is then pass through a logical circuit which is also controlled by the logistic map. After the analyses of simulation results, the design will be implemented on FPGA reconfigurable Hardware. The results show that the proposed generator generate a pseudo random sequences that satisfy all the NIST statistical tests, offers a high throughput and has low cost for hardware implementation