Microsoft’s CAPTCHA successfully broken

Jeff Yan and Ahmad Salah El Ahmad, at the School of Computing Science, Newcastle University, England recentlypublished a research paper entitled “A Low-cost Attack on a Microsoft CAPTCHA“, demonstrating how they’ve managed to attack the Microsoft’s CAPTCHA used on several of their online services such as Hotmail and Windows Live, with over 92% recognition rate.

Read the full research by downloading the report in PDF format:

For the research summary… please head to

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