In order to understand the development of current channel energy analysis technology and protection strategy, at the same time, we will lay the foundation for establishing safety evaluation system about Encryption device in the next stage. We analyzed the side-channel attacks of the current mainstream encryption algorithms. The side-channel attack is classified by combining the specific operations of the algorithm that are easily attacked by the attacker. Aiming at the more popular DPA attacks, the paper focuses on the corresponding protection strategies, including the first-order DPA attack defense strategy and the second-order DPA attack defense strategy. Finally, the evaluation index of the current safety assessment system is summarized, and the effect of each index is elaborated.

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The portability and various functions of mobile devices enable them to go deep into people's study, work and life. While it is convenient for people, mobile devices contain a large number of user’s private information, such as the user's personal property information, identity information and even the confidential information of enterprise etc. Side-channel attack is currently one of the most effective ways to steal private information of cryptographic devices thus the threat to mobile devices can be imagined. In this paper, the electromagnetic side-channel attack based on AES encryption algorithm on mobile device—PCM-9589F Multi-COM Board is studied. A new signal acquisition platform is designed, which solves the problem that the difficulty in locating the side-channel electromagnetic leakage signal of the mobile devices. In addition,using the time-frequency analysis and filter technology,we extract the encryption features of AES on PCM-9589F Multi-COM Board.