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Chaotic encryption schemes are believed to provide greater level of security than conventional ciphers. In this paper, a chaotic stream cipher is first constructed and then its hardware implementation details over Xilinx Virtex-6 FPGA are provided. Logistic map is the simplest chaotic system and has high potential to be used to design a stream cipher for real-time embedded systems. Its simple construct and non-linear dynamics makes it a common choice for such applications. In this paper, we present a Modified Logistic Map (MLM) which improves the performance of Logistic Map in terms of higher Lyapunov exponent and uniformity of bifurcation map. It also avoids the stable orbits of logistic map giving a more chaotic behavior to the system. A stream cipher is built using MLM and random feedback scheme. The proposed cipher gives 16 bits of encrypted data per clock cycle. The hardware implementation …