page_title: Gili Raanan
section_title: Business career
hierarchical_section_title: Gili Raanan / Business career
caption_attribution_description: English: I crested this image עברית: אני ייצרתי את התמונה
context_page_description: Gili Raanan is an Israelli inventor who is one of the inventors of CAPTCHA, the WAF and many other inventions in the fields of application security and discovery. Raanan started Sanctum in 1997, and invented the first Web application firewall AppShield and the first Web application penetration testing software AppScan. He later started NLayers which was acquired by EMC Corporation pioneering the science of Application discovery and understanding. He is an investor and a General Partner at Sequoia Capital, the Founder of Cyberstarts, and was a board member at Adallom, Armis Security, Onavo and Snaptu.
context_section_description: Raanan started Sanctum in 1997, and invented the first Web application firewall AppShield and the first Web application penetration testing software AppScan.
  As part of the research on Application Security Raanan co-invented CAPTCHA, as described in the patent application "The invention is based on applying human advantage in applying sensory and cognitive skills to solving simple problems that prove to be extremely hard for computer software. Such skills include, but are not limited to processing of sensory information such as identification of objects and letters within a noisy graphical environment".
  Raanan later started NLayers in 2003 which was acquired by EMC Corporation pioneering the science of Application discovery and understanding.
caption: This CAPTCHA of "Quick3" obscures its message from computer interpretation by twisting the letters and adding slight background color gradient. It is taken from the 1997 patent application.
exif: {"Image Artist": "Gili Raanan", "Image ExifOffset": "2134", "Image XPAuthor": "Gili Raanan", "Image Padding": "[]", "EXIF Padding": "[]"}