FIELD: computer network security.
SUBSTANCE: present invention relates to the security of computer networks, including unauthorized access to Internet resources, namely, to the methods for image formation and types of tasks to the user when the user passes a fully automated Turing test (CAPTCHA). This result is achieved by choosing a video sequence of a natural scene as the source of the captcha image and forming two images: the first one is the background image, the second one is the foreground image, so that the foreground image is placed in an arbitrary point in the frame or its proportions or integrity are distorted, or it is tilted, or the listed changes to the foreground image in their combination are made, then the second one is the foreground image that is superimposed on top of the first, background image and automatically a single image is formed, an “unnatural collage’, at least one image of the "unnatural collage" is shown to the user of the captcha.
EFFECT: providing secure access to Internet resources.
1 cl, 6 dwg
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