中文摘要：

录像显示器单位(VDU ) 的显示器图象能被收到并且分析意外电磁的噪音重建从一个个人计算机系统发出了。这个事实是在信息安全的信息漏威胁之一。因此，有效地并且快速形成 PC 显示以便为收到电磁的妥协辐射选择最好的频率范围，一个方法基于关联电源分析(CPA ) 和普通设备被建议。第一，当 PC 正在显示白黑色的垂直脱衣图象和黑图象时，到 1 GHz 的 10 MHz 的频率光谱分别地被测量大约 10 次。包含显示信息的频率范围能通过 CPA 被获得。然后，特殊图象信号在点频率和泛音附近被寻找。如果当显示全部的黑图象时，特殊信号消失，是真实特殊信号能被判定。最后，最好的收到频率范围能被全面考虑选 CPA 和信号的结果到特殊图象信号的噪音比率(SNR ) 。为了检查选择频率的有效性，变化，偷听实验被执行。结果证明选择频率范围能比另外的频率乐队检索高质量的图象。

英文摘要：

The display image of the video display unit （VDU） can be reconstructed by receiving and analyzing the unexpected electromagnetic noise emanated from a personal computer system. This fact is one of the information leakage threats in information security. Therefore, in order to choose the best frequency range for receiving the electromagnetic compromising emanations form a PC display effectively and quickly, a method based on the correlation power analysis （CPA） and the common equipments is proposed. Firstly, the frequency spectrum of 10 MHz to 1 GHz is measured about 10 times respectively when the PC is displaying the white-black vertical strips image and black image. The frequency range which contains the display information can be obtained through the CPA. And then, the special image signal is searched around the dot frequency and harmonics. If the special signal disappears when displaying the total black image, it can be judged to be the real special signal. Finally, the best receiving frequency range can be chosen by comprehensive considering the results of CPA and the signal to noise ratio （SNR） of the special image signal. In order to check the validity of the chosen frequency range, eavesdropping experiments are carried out. The results demonstrate that the selected frequency range can retrieve the higher quality image than other frequency bands.