• Skip to main content
  • Skip to primary navigation
  • Departments
    • Bioengineering
    • Civil and Environmental Engineering
    • Electrical Engineering and Computer Sciences
    • Industrial Engineering and Operations Research
    • Materials Science and Engineering
    • Mechanical Engineering
    • Nuclear Engineering
    • Aerospace program
    • Engineering Science program
  • News
    • Berkeley Engineer magazine
    • Social media
    • News videos
    • News digest (email)
    • Press kit
  • Events
    • Events calendar
    • Commencement
    • Homecoming
    • Cal Day
    • Space reservations
    • View from the Top
    • Kuh Lecture Series
    • Minner Lecture
  • College directory
  • For staff & faculty
Berkeley Engineering

Educating leaders. Creating knowledge. Serving society.

  • About
    • Facts & figures
    • Rankings
    • Mission & values
    • Equity & inclusion
    • Voices of Berkeley Engineering
    • Leadership team
    • Milestones
    • Buildings & facilities
    • Maps
  • Admissions
    • Undergraduate admissions
    • Graduate admissions
    • New students
    • Visit
    • Maps
    • Admissions events
    • K-12 outreach
  • Academics
    • Undergraduate programs
    • Majors & minors
    • Undergraduate Guide
    • Graduate programs
    • Graduate Guide
    • Innovation & entrepreneurship
    • Kresge Engineering Library
    • International programs
    • Executive education
  • Students
    • New students
    • Advising & counseling
    • ESS programs
    • CAEE academic support
    • Student life
    • Wellness & inclusion
    • Undergraduate Guide
    • > Degree requirements
    • > Policies & procedures
    • Forms & petitions
    • Resources
  • Research & faculty
    • Centers & institutes
    • Undergrad research
    • Faculty
    • Sustainability and resiliency
  • Connect
    • Alumni
    • Industry
    • Give
    • Stay in touch
Home > News > Fighting human trafficking

Fighting human trafficking

Cover of Spring 2018 issue
June 1, 2018
This article appeared in Berkeley Engineer magazine, Spring 2018
  • In this issue

    Features

    Universities and the digital transformation of society

    Then & now

    Out of the GAIT

    Space mapping

    Dean’s word

    Upfront

    • Patterson wins Turing award
    • Redesigning wind power
    • Q+A on nuclear nonproliferation
    • Solar cruiser
    • Dam scanning
    • Blockchain comes to campus

    Breakthroughs

    • Curing diseases with CRISPR
    • Robot’s play
    • “Invisible” displays
    • Solar power windows
    • Fighting human trafficking

    New & noteworthy

    • Introducing FEMTech
    • Farewell

    Download this issue

  • Past issues

Human traffickers commonly post online ads selling sex, but they are often difficult for law enforcement to trace. Now, Berkeley computer science Ph.D. candidate Rebecca Portnoff, working with researchers from UC San Diego and New York University, has developed the first automated techniques to link ads to bitcoin, the leading payment method for online sex ads, and potentially identify those ads tied to human trafficking rings. The research team’s approach used two novel algorithms. The first is a machine-learning algorithm that identifies separate ads for different sex workers that share a single author, a potential sign of a trafficking ring. The second algorithm takes publicly available information from bitcoin and compares payment timestamps with timestamps of the ads’ appearance. The researchers tested these techniques on a sampling of 10,000 real sex ads and reported an 89 percent true-positive rate for grouping ads by author — significantly more accurate than current algorithms — as well as a high rate of linking ads to bitcoin transactions. The researchers plan to work with law enforcement and nonprofit organizations to further refine their analysis.

Topics: Public policy, Computing, Research
  • Contact
  • Give
  • Privacy
  • UC Berkeley
  • Accessibility
  • Nondiscrimination
  • instagram
  • X logo
  • linkedin
  • facebook
  • youtube
  • bluesky
© 2025 UC Regents