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The AES combined S-box/inverse S-box is a single construction that is shared between the encryption and decryption data paths of the AES. The currently most compact implementation of the AES combined S-box/inverse S-box is Canright's design, introduced back in 2005. Since then, the research community has introduced several optimizations over the S-box only, however the combined S-boxlinverse S-box received little attention. In this paper, we propose a new AES combined S-boxlinverse S-box design that is both smaller and faster than Canright's design. We achieve this goal by proposing to use new tower field and optimizing each and every block inside the combined architecture for this field. Our complexity analysis and ASIC implementation results in the CMOS STM 65nm and NanGate 15nm technologies show that our design outperforms the counterparts in terms of area and speed.

The implementation of AES S-boxes is one of the most extensively studied areas of cryptography. In this paper, we propose three new hardware designs for the AES S-box that can serve in the forward, inverse and combined data paths. Each of these designs represents the smallest AES S-box ever proposed in its respective category. We achieve this goal by using new tower field representation over normal bases and optimizing each and every block inside the three proposed architectures. Our complexity analysis and ASIC synthesis results in the CMOS STM 65nm, as well as the NanGate 15nm technologies, show that our designs outperform their counterparts in terms of area and power.

This paper presents a proposed design procedure of a Wireless Power Transfer (WPT) system based on high efficiency offset reflector antennas fed by conical horns. The system's performance evaluation is also demonstrated. The antennas in the transmitter and receiver sides of the proposed WPT system are symmetric. The performance of the system is optimized by calibrating the feeding horns and the offset reflector's dimensions to minimize the path and reflection losses of the proposed WPT system. The results show that correct line of sight alignment of the transmitter and receiver enhances the efficiency of the system. With an operating frequency of 6 GHz and 1 W of power transfer over a distance of 12 m between the transmitter and receiver, the system attains a total transfer efficiency of 62.9 %.