Unicode CAPTCHA Validation via Coordinate Distance Analysis
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Solution Overview
Problem
Conventional CAPTCHAs rely on word recognition, which is prone to user errors and limited by character sets, offering insufficient security against automated guessing.
Innovation Solution
Generating Unicode-based tests that include a range of characters beyond the standard alphabet, using a challenge and response image with randomly selected characters, where the user must identify challenge characters within a response region, and validating responses based on coordinate accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional word recognition CAPTCHAs are used, then users can solve them with standard keyboards, but security is insufficient against automated guessing
Solution Approach 1:
The patent changes the parameter of character set from standard alphabet to Unicode characters, expanding the possible characters to include emojis and other graphical symbols. This increases security by making automated guessing more difficult while maintaining user ability to solve through visual identification.
Solution Approach 2:
The patent replaces the mechanical typing system with a visual selection system. Instead of requiring users to type characters on a keyboard, users visually identify and select challenge characters from a response region, eliminating keyboard dependency and expanding character set versatility.
2Reliability
If Unicode-based tests with broader character sets are used, then security is enhanced, but user error in identification may increase
Solution Approach 1:
The patent segments the response region into multiple selectable character options, allowing users to identify challenge characters by visual matching rather than typing. This segmentation reduces user error by providing clear visual choices and eliminating keyboard input mistakes.
Solution Approach 2:
The patent introduces an intermediary visual selection interface between the challenge and the validation process. Users interact with graphical character selections rather than directly typing, which mediates the interaction and reduces errors while maintaining security through the broader Unicode character set.
3Ease of operation
If visual identification with response region is used, then user error is reduced, but device compatibility requirements increase
Solution Approach 1:
The patent employs Unicode characters that can be displayed across multiple device types and operating systems. By using universally supported Unicode standards, the system achieves multi-functionality across different devices while maintaining visual identification capabilities that reduce user error.
Data Source
AI summary
Systems and methods for testing to tell computers and humans apart and generating said tests are described. An interface is generated that includes a challenge and a response is provided, and a plurality of user selections of locations in the interface are received. A server compares the x coordinate and the y coordinate of each user selection with x and y coordinates for a subset of the plurality of characters in the response to obtain a distance value for each user selection. The server then sums the distance values for each user selection to obtain a total distance value. The server subsequently compares the total distance to a predetermined threshold, the server validating the user response when the total distance is less than the predetermined threshold, the validating causing access to be provided to web content specified in the user request.