METHOD FOR REALIZING TWO DIMENSIONAL CODE COPY PREVENTION AND REALIZATION SYSTEM THEREOF

摘要

Provided are a method for realizing two dimensional code copy prevention and a realization system thereof. The method comprises: acquiring input information of a user, and converting the input information into an image gray value, and then adding a finder pattern to obtain a two dimensional code (S100); when the two-dimensional code is obtained through photographing, sequentially recovering, demodulating and decoding the image to obtain encoded information (S200); and performing spectrum analysis according to the two dimensional code after image recovering, and determining whether extreme points obtained through the spectrum analysis meet an expected distribution, and when the expected distribution is not met, prompting the two dimensional code has been copied (S300). By combining a communication channel model of the two dimensional code with physical device characteristics, the method analyzes resample spectral characteristics of the image signal, and on the basis of ensuring a robustness of a low-resolution mobile camera device reading the two dimensional code, by utilizing an aliasing feature and a strong correlation noise feature of the image signal, the method obtains a valid evidence of a scanning-printing attack of the two dimensional code.