Collected research

Port Contention Goes Portable: Port Contention Side Channels in Web Browsers

Thomas Rokicki, Clémentine Maurice, Marina Botvinnik and Yossi Oren · thomasrokicki.github.io

A port contention side channel running entirely in a web browser: WebAssembly instructions chosen to saturate specific Intel execution ports let a page time contention from code sharing the same SMT core. It gives a 200 bit/s cross-browser covert channel and 1024-instruction spatial resolution, and evades browser timer limits and cache-targeted countermeasures.

Record

Researcher

Thomas Rokicki, Clémentine Maurice, Marina Botvinnik and Yossi Oren

Published by

thomasrokicki.github.io

Format

Whitepaper

Topic

Browser

In the archive

• Collected in the 2022 research round

Tags

• side-channel
• timing-attack
• webassembly
• javascript
• info-leak

This page is the archive's own catalogue record. The research is the work of Thomas Rokicki, Clémentine Maurice, Marina Botvinnik and Yossi Oren, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 14 August 2026.