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CAPTCHA Rainbow Tables Attacking Dynamic CAPTCHA Identifiers CAPTCHA MD5 CAPTCHA Solution 68ecb8867cd7457421c2eca3227bffbd 95C7A 84a78d24bc9637fcfb152f723b6e8e27 58413 84125db583d64c346d97a74fa9e53848 C6a1ed9477846568cdea62c97e389811 E9fa81f69debe45bded7bba4743a8a23 9D3BF 49F1C ABB87 ... B9df819f6174d6577661e12859226366 D498A www.foundstone.com © 2010, McAfee, Inc.
CAPTCHA Rainbow Tables Dynamic Identifiers and Changing Images Write your custom solvers! www.foundstone.com © 2010, McAfee, Inc.
Page 1 and 2: Attacking CAPTCHAs for Fun and Prof
Page 3 and 4: Research Scope Quantcast Top 1 Mill
Page 5 and 6: From Here On… Breaching the Clien
Page 7 and 8: Hidden Fields, Client Side Storage
Page 9 and 10: Arithmetic CAPTCHAs www.foundstone.
Page 11 and 12: CAPTCHA Rainbow Tables Implementati
Page 13: CAPTCHA Rainbow Tables Attacking St
Page 17 and 18: CAPTCHA Fixation Attack Client 1 GE
Page 19 and 20: Persistent CAPTCHAs Same CAPTCHA wa
Page 21 and 22: In Session CAPTCHA Brute-Force Clie
Page 23 and 24: OCR Assisted CAPTCHA Brute-Force So
Page 25 and 26: The Victims www.foundstone.com © 2
Page 27 and 28: TesserCap Introduction Retrieve CAP
Page 29 and 30: Spatial Filters This Image: Digital
Page 31 and 32: TesserCap Results CAPTCHA Provider
Page 33 and 34: Let’s Play Nice a.k.a. Conclusion
Page 35 and 36: A Secure CAPTCHA Implementation No
Page 37: Thank You! Gursev Singh Kalra (@igu

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