CAPTCHA image scramble
View Patent ↗In one embodiment, a client computing device receives information regarding a Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA). The CAPTCHA includes an image file, a challenge, and code that is executable by a web browser to unscramble the received image file. The code includes instructions to divide the received image file into image sections, each image section having a unique identifier and grouped into either a first set or a second set. The code further contains instructions to transpose each image section in the first set into a new position, creating a new image. A web browser of the client computing device executes the code to create a second image from the received image file. The second image and the challenge are presented to a user of the client computing device.
1. A method comprising:
by a client computing device, receiving information for a Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) comprising:
a first static image file comprising a plurality of image sections, wherein each of the plurality of image sections is in a first relative position within the first static image file and is associated with a unique identifier;
a challenge; and
web-browser-executable code for modifying the first static image file comprising:
identification of a first subset and a second subset of the plurality of image sections comprising the first static image file; and
for each of the image sections in the first subset, instructions to transpose the image section to a second relative position, wherein the instructions are based on the unique identifier;
by the client computing device, executing the web-browser-executable code through a web browser application of the client computing device to modify the first static image file to create a second static image file using only the first subset of image sections; and
by the client computing device, presenting the second static image file and the challenge for display to a user of the computing device.
2. The method of claim 1 , wherein the instructions to transpose the image section comprise instructions to move the image section by a number of pixels in a horizontal and/or vertical direction.
3. The method of claim 1 , wherein:
the first static image file is created from an original image by:
cutting the original image into a third subset of image sections;
recording the positions of the image sections in the original image;
adding one or more additional image sections comprising:
an image section of a different image unrelated to the original image; or
a duplicate image section of a particular image section of the original image; and
randomly rearranging the third subset of image sections and the additional image sections.
4. The method of claim 3 , wherein the first subset of image sections is the third subset of image sections.
5. The method of claim 3 , wherein the second static image file is identical to the original image.
6. The method of claim 3 , wherein the original image is cut horizontally or vertically or both horizontally and vertically.
7. The method of claim 3 , wherein the challenge is based on the original image.
8. The method of claim 1 , wherein the information for the CAPTCHA is received in response to a request sent by the client computing device to perform an action on a computing server.
9. The method of claim 1 , wherein the web-browser-executable code comprises Hyper Text Markup Language (HTML) code.
10. The method of claim 9 , wherein the unique identifier comprises an “li” HTML tag.
11. The method of claim 1 , wherein the web-browser-executable code comprises Cascading Style Sheets (CSS) code.
12. The method of claim 1 , wherein each of the plurality of image sections has an identical size.
13. One or more computer-readable, non-transitory storage media embodying software that is operable when executed to:
receive information for a Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) comprising:
a first static image file comprising a plurality of image sections, wherein each of the plurality of image sections is in a first relative position within the first static image file and is associated with a unique identifier;
a challenge; and
web-browser-executable code for modifying the first static image file comprising:
identification of a first subset and a second subset of the plurality of image sections comprising the first static image file; and
for each of the image sections in the first subset, instructions to transpose the image section to a second relative position, wherein the instructions are based on the unique identifier;
execute the web-browser-executable code through a web browser application to modify the first static image file to create a second static image file using only the first subset of image sections; and
present the second static image file and the challenge for display to a user.
14. The media of claim 13 , wherein the instructions to transpose the image section comprise instructions to move the image section by a number of pixels in a horizontal and/or vertical direction.
15. The method of claim 13 , wherein:
the first static image file is created from an original image by:
cutting the original image into a third subset of image sections;
recording the positions of the image sections in the original image;
adding one or more additional image sections comprising:
an image section of a different image unrelated to the original image; or
a duplicate image section of a particular image section of the original image; and
randomly rearranging the third subset of image sections and the additional image sections.
16. The method of claim 15 , wherein the first subset of image sections is the third subset of image sections.
17. The method of claim 15 , wherein the second static image file is identical to the original image.
18. The method of claim 15 , wherein the original image is cut horizontally or vertically or both horizontally and vertically.
19. The method of claim 15 , wherein the challenge is based on the original image.
20. A system comprising:
one or more processors; and
a memory coupled to the processor comprising instructions executable by the processors, the processors being operable when executing the instructions to:
receive information for a Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) comprising:
a first static image file comprising a plurality of image sections, wherein each of the plurality of image sections is in a first relative position within the first static image file and is associated with a unique identifier;
a challenge; and
web-browser-executable code for modifying the first static image file comprising:
identification of a first subset and a second subset of the plurality of image sections comprising the first static image file; and
for each of the image sections in the first subset, instructions to transpose the image section to a second relative position, wherein the instructions are based on the unique identifier;
execute the web-browser-executable code through a web browser application to modify the first static image file to create a second static image file using only the first subset of image sections; and
present the second static image file and the challenge for display to a user.