SM4 is a block cipher proposed by the Chinese government. Strengthening the research and extension of SM4 is significant to the development and promotion of Chinese cryptography standards. To date, research relevant to SM4 is rare. Thus, we propose the implementation of an SM4 algorithm resistant to power analysis. Ideally, a secure masking scheme is used for the SM4 cipher, which is particularly suited for implementation in the application specific integrated circuit. Moreover, the mask scheme in our chip implementation process is improved to make SM4 safer. Simulation results confirm that the use of counteractive measures resistant to power analysis is credible.

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Security is a crucial issue for many wireless sensor networks and firewall is an approach adopted by such WSNs. With the complexity of wireless sensor networks increasing faster and faster, rules are more complicated than traditional computer network. The detection and resolution of the rule conflict become a challenging aspect for such networks. This paper proposes an algorithm for firewall policy conflict detection and resolution based on segmentation strategies and Quicksort algorithm. The experiments show that the algorithm is much faster than traditional methods and is suitable for large scale WSNs.