Captcha

• 2015/08/05 Tool Demo : Blackhat : PixelCaptcha: A unicode based captcha scheme - Gursev Singh Kalra
• 2013/09/27 Talk : C0c0n : Blur Captcha - Anirudh Duggal Abhinav Mohanty
• 2012/02/15 Talk : Nullcon : CAPTCHAs for fun and Profit - Gursev Singh Kalra
• 2008/12/06 Talk : Clubhack : Insecure Implementation of Security Best Practices: of hashing, CAPTCHA’s and Caching - Karmendra Kohli