Instruct: Given the title of a paper, retrieve paper titles that are cited by the given paper
Query: CAPTCHA Design: Color, Usability, and Security
Usability of CAPTCHAs or usability issues in CAPTCHA design
Survey of Different Types of CAPTCHA
Text-based CAPTCHA strengths and weaknesses
On the security of text-based 3D CAPTCHAs
A CAPTCHA Implementation Based on 3D Animation
IMAGINATION: a robust image-based CAPTCHA generation system
A more secure scheme for CAPTCHA-based authentication in cloud environment
A three-way investigation of a game-CAPTCHA: automated attacks, relay attacks and usability
Drag and Drop: A Better Approach to CAPTCHA
Gestalt geometric CAPTCHA
The robustness of hollow CAPTCHAs
Recognizing objects in adversarial clutter: breaking a visual CAPTCHA
A low-cost attack on a Microsoft captcha
An efficient segmentation algorithm for CAPTCHAs with line cluttering and character warping
Breaking Microsoft ’ s CAPTCHA
CAPTCHA smuggling: hijacking web browsing sessions to create CAPTCHA farms
reCAPTCHA: Human-Based Character Recognition via Web Security Measures
Automatic Generation of Game-based CAPTCHAs
A Simple Generic Attack on Text Captchas
Mitigating denial of service attack using CAPTCHA mechanism
Deep Cropping via Attention Box Prediction and Aesthetics Assessment
On-Line and Off-Line Handwriting Recognition : A Comprehensive Survey
Design and Application of a VOC-Monitoring System Based on a ZigBee Wireless Sensor Network
High-performance long range obstacle detection using stereo vision
Untangling the Links of Parental Responsiveness to Distress and Warmth to Child Outcomes