Sergey Frolov

Internet Freedom ◦ Network Security


I’m a 4th year Computer Science PhD student at the University of Colorado Boulder,
where I research Internet censorship and network security, advised by Eric Wustrow.

I enjoy building practical anti-censorship solutions. Cypherpunks write code.


The use of TLS in Censorship Circumvention
    Sergey Frolov and Eric Wustrow
    In 26th Network and Distributed System Security Symposium (NDSS'19)

An ISP-Scale Deployment of TapDance
    Sergey Frolov, Fred Douglas, Will Scott, Allison McDonald, Benjamin VanderSloot, Rod Hynes, Adam Kruger, Michalis Kallitsis, David G. Robinson, Steve Schultze, Nikita Borisov, J. Alex Halderman, and Eric Wustrow
    In 7th USENIX Workshop on Free and Open Communications on the Internet (FOCI'17)

Latest Post

Jan 13, 2019

Russian Internet is still overly censored

I recently went to Russia for 2 weeks to see family, friends, and celebrate winter holidays. During my relatively short visit I didn’t browse the web much, and didn’t intentionally look for blocked websites, but still recieved RSTs from the national firewall while visiting All those sites, including, were blocked unintentionally. This have happened because Roskomnadzor started carpet blocking IP addresses in order to interfere with Telegram, eventually blocking over 16 million addresses, and, presumably, sites above are on the list. Read more


Secure messaging: you can DM me using my nickname on Wire(@sfrolov), and Telegram(@srfrolov).
To get in touch over Signal or WhatsApp, contact me elsewhere for the phone number.

My current local time is .