(C) Alec Muffett's DropSafe blog.
Author Name: Alec Muffett
This story was originally published on allecmuffett.com. [1]
License: CC-BY-SA 3.0.[2]


What is messaging app Signal and how secure is it?

2025-05

The messaging app Signal has made headlines after it emerged it had been used to discuss war plans at the highest levels of the US government.

In March, the White House confirmed it was used for a secret group chat about air strikes against the Houthi group in Yemen, to which the editor-in-chief of the Atlantic, Jeffrey Goldberg, was inadvertently added.

In April, the New York Times and others reported US Defence Secretary Pete Hegseth shared information about the same military action in a second private Signal group, which his wife, brother and personal lawyer were members of.

Signal's creator Matthew Rosenfeld - who is better known by the pseudonym Moxie Marlinspike - has joked, external the "great reasons" to join the platform now include "the opportunity for the vice president of the United States of America to randomly add you to a group chat for coordination of sensitive military operations".

But others are not seeing the funny side, with Democrat Senate leader Chuck Schumer calling it "one of the most stunning" military intelligence leaks in history and calling for an investigation.

But what actually is Signal - and how secure or otherwise were the senior politicians' communications on it?
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[1] URL: https://www.bbc.co.uk/news/articles/c1kjd091019o
[2] URL: https://creativecommons.org/licenses/by-sa/3.0/

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