CAPTCHA System with Distorted Ad Text
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current CAPTCHA methods fail to effectively combine advertising with security, as users may skip video-based ads and non-image CAPTCHAs are vulnerable to OCR and image recognition, leading to ineffective advertising and security breaches.
Innovation Solution
A CAPTCHA system that generates a distorted advertisement word combined with randomly generated and distorted characters, requiring users to type both for verification, with features like token-based verification and caching for improved security and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If video-based CAPTCHA with advertisement is used, then advertising effect is improved, but users may skip the video without seeing the ad content
Solution Approach 1:
The patent merges the CAPTCHA functionality with advertising by combining CAPTCHA text characters with advertisement content into a single image. Users must read and transcribe both the CAPTCHA characters and the advertisement text, ensuring they engage with the ad content while completing the security verification. This integration ensures that advertising exposure is achieved reliably since users cannot skip the content without failing the CAPTCHA.
2Reliability
If CAPTCHA text is made more distorted to improve security, then resistance to OCR is improved, but ease of recognition by humans deteriorates
Solution Approach 1:
The patent applies different distortion levels to different parts of the CAPTCHA image. The advertisement text portion is less distorted compared to the CAPTCHA character portion, creating local quality differences. This allows humans to easily recognize the advertisement text while the more distorted CAPTCHA characters provide security against automated OCR systems. The selective distortion maintains both advertising clarity and security requirements.
3Quantity of substance
If advertisement words are added to CAPTCHA image, then advertising effect is improved, but vulnerability to image recognition attacks increases
Solution Approach 1:
The patent creates asymmetry in the CAPTCHA image by including advertisement text that is intentionally less distorted than the CAPTCHA characters. This asymmetric distortion pattern confuses automated image recognition systems that expect uniform distortion across all text elements. Meanwhile, human users can easily distinguish and read the less distorted advertisement text, maintaining both advertising effectiveness and security against automated attacks.
Data Source
AI summary
A CAPTCHA method executed by a CAPTCHA system is provided, comprising: receiving a CAPTCHA request comprising category information of an application service from an application server; responding to the application server with a token identifying the CAPTCHA request and a CAPTCHA image comprising a distorted advertisement word associated to the category information and a series of randomly generated and distorted characters, both the advertisement word and the characters being a CAPTCHA text intended to be typed by a user via a user equipment connected to the application server; receiving from the application server the token and a CAPTCHA answer submitted from the user equipment by the user; and verifying the token and the answer and returning to the application server a result of the verification. This provides an improved CAPTCHA system and method with better advertising effects and security.