CoverDrop: Blowing the Whistle Through A News App

Mansoor Ahmed-Rengers, Diana A. Vasile, Daniel Hugenroth, Alastair R. Beresford, Ross Anderson

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Whistleblowing is hazardous in a world of pervasive surveillance, yet many leading newspapers expect sources to contact them with methods that are either insecure or barely usable. In an attempt to do better, we conducted two workshops with British news organisations and surveyed whistleblowing options and guidelines at major media outlets. We concluded that the soft spot is a system for initial contact and trust establishment between sources and reporters.Cover-Drop is a two-way, secure system to do this. We sup-port secure messaging within a news app, so that all its other users provide cover traffic, which we channel through a threshold mix instantiated in a Trusted Execution Environment within the news organisation. CoverDrop is designed to resist a powerful global adversary with the ability to issue warrants against infrastructure providers, yet it can easily be integrated into existing infrastructure. We present the results from our workshops, describe CoverDrop’s design and demonstrate its security and performance.
Original languageEnglish
Pages (from-to)47-67
Number of pages21
JournalProceedings on Privacy Enhancing Technologies
Issue number2
Publication statusPublished - 3 Mar 2022

Keywords / Materials (for Non-textual outputs)

  • whistleblowing
  • anonymous communication
  • mobile application


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