In this paper, a novel image encryption algorithm is proposed based on the combination of the chaos sequence and the modified AES algorithm. In this method, the encryption key is generated by Arnold chaos sequence. Then, the original image is encrypted using the modified AES algorithm and by implementing the round keys produced by the chaos system. The proposed approach not only reduces the time complexity of the algorithm but also adds the diffusion ability to the proposed algorithm, which make the encrypted images by the proposed algorithm resistant to the differential attacks. The key space of the proposed method is large enough to resist the brute-force attacks. This method is so sensitive to the initial values and input image so that the small changes in these values can lead to significant changes in the encrypted image. Using statistical analyses, we show that this approach can protect the image against the statistical attacks. The entropy test results illustrate that the entropy values are close to the ideal, and hence, the proposed algorithm is secure against the entropy attacks. The simulation results clarify that the small changes in the original image and key result in the significant changes in the encrypted image and the original image cannot be accessed.

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Carbon Nanotube field-effect transistor (CNFET) can be a good alternative to the MOS transistors for high performance Static Random Access Memory (SRAM). The SRAM use as the cache for computers and many portable devices. Carbon nanotube field effect transistors are employed to realize the new design methodology. Main features of this technology provide multi-Vt circuitry with the flexibility which is highly important to MVL design. Ternary logic has fundamentally the potential of high computational speed in comparison with conventional binary logic. This paper presents a novel design of a ternary memory cell based on CNFETs. The proposed design is simulated by HSPICE on CNFET model with 0.9 V power supply. Simulation results illustration the improvement in terms of standby power consumption and speed in comparison with previous designs.

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