~/talk

SenCAPTCHA: A Mobile-First CAPTCHA Using Orientation Sensors

on YouTube 05m
Talkat UbiComp / ISWC 2020 · 2020-09-12..09-17· [security, web-platform]

speakers

name:Yunhe Feng
links:none on file
name:Qing Cao
links:none on file
name:Hairong Qi
links:none on file
name:Scott Ruoti
links:none on file

resources

video:https://youtu.be/xGJUsOR0OyM
slides:none on file

summary

A mobile-first CAPTCHA that uses orientation sensors drives a red ball into an animal eye; images are mutated by rotation, zooming, and tiling and trajectory is analyzed with Dynamic Time Warping to tell humans from bots. Evaluation uses three ML attack models and claims resilience, and two user studies with 472 participants show SUS >60, median completion under 5 seconds, and roughly half of users prefer it. Implementation and datasets are open-sourced at www.sencaptcha.org.

AI-written summary · about

chapters (7)

  1. 0:00Introduction
  2. 0:28Background
  3. 1:30Explanation
  4. 3:19Machine Learning
  5. 3:31Usability
  6. 4:04User Study
  7. 5:03Conclusion

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