A Method to Extract the Synchronous Characters in the Electromagnetic Information Leaked by a Computer

摘要：

Receiving and recovering of computer video—leaking information is an important part in TEMPEST which is essential for information interception and safety. The pick — up of synchronous signal is predetermination of this technology. In this paper, a similar Harr Wavelet method and Hough transform technology are used to extract the tilt angle of the image recovered from video-leaking information. Based on the tilt angle, direction of the synchronizing deviation can be automatically recognized. The synchronizing deviation is used to adjust the frequency of the synchronous signal and reduce the synchronizing deviation gradually until the synchronal accuracy is enough for steady display.

关键词： information eavesdroppin leakage information TEMPEST harr wavelet

作者: Changbo Xiang Jianhua Xu

作者单位: National Key Laboratory of Science and Technology on Electronic Test and Measurement Qingdao, China The 41st Institute China Electronics Technology Group Corporation Qingdao, China

会议类型: 国际会议

会议名称: 2011 4th International Congress on Image and Signal Processing(第四届图像与信号处理国际学术会议 CISP 2011)

会议地点: 上海

会议语种:英文

页码: 2661-2664

在线出版日期: 2011-10-15（万方平台首次上网日期，不代表论文的发表时间）