Research of data collecting part on testing and imaging system of remaining trace on paper
Jiaxuan Liang · Journal of Shenyang Institute of Aeronautcal Engineering · 2005
With the rapid development of information technology, information security has been given increasing attention. The security departments, in particular, have attached greater importance to the document secrecy and they impose strict restrictions on the readers of the secret documents. This article elaborates on the testing principles and working procedures of the remaining trace on paper (mainly invisible fingerprints of sweat). Now the generally accepted method to handle and collect invisible fingerprints of sweat is by means of lime or ink powder. And the most proper way on such penetrating material carriers as paper and cardboard is steaming iodine approach. However all the above mentioned methods will damage the testing samples differently. In order to keep the testing samples original, a new method is proposed to test and get image of the invisible sweat fingerprints. The new approach is to test the difference of resistance between the remaining trace in paper and non-remaining trace, and input the tested data into computer.