Building Segmentation Based Human-Friendly Human Interaction Proofs (HIPs)

Human interaction proofs (HIPs) have become common place on the internet due to their effectiveness in deterring automated abuse of online services intended for humans. However, there is a co-evolutionary arms race in progress and these proofs are becoming more difficult for genuine users while attackers are getting better at breaking existing HIPs. We studied various popular HIPs on the internet to understand their strength and human friendliness. To determine HIP strength, we adopted a direct approach of building computer attacks using image processing and machine learning techniques. To understand human-friendliness, a sequence of users studies were conducted to investigate HIP character recognition by humans under a variety of visual distortions and clutter commonly employed in reading-based HIPs. We found that many of the online HIPs are pure recognition tasks that can be easily broken using machine learning. The stronger HIPs tend to pose a combination of segmentation and recogni...

• Type: Conference
• Year: 2005
• Where: HIP
• Authors: Kumar Chellapilla, Kevin Larson, Patrice Y. Simard, Mary Czerwinski
• Keywords: Cryptography, HIP 2005, HIP Character Recognition, Stronger Human-friendly Hips, Various Popular Hips