Journalists use #Signal to talk to sources and share tips safely. The app helps protect privacy, but #journalists are often targets. To stay safe, they should secure their Signal account. This article explains how. The tips are also useful for ordinary users.

https://freedom.press/digisec/blog/locking-down-signal/

Locking down Signal

Also available in Spanish.

Freedom of the Press
@librarianbe ..or they could instead use a messenger that is decentralized, really open source and doesn't require a phone number.
@cos @librarianbe Signal is literally *the* gold standard in encrypted messaging (and yes, it's open source). It's almost like you want to get journalists compromised and killed.
@chiraag @librarianbe it is not "gold standard", nor it is open source as people understand open source. I'd advise against using it if you need security and privacy. It is better than many alternatives such as WhatsApp or Telegram, but still..

@cos @librarianbe Quite literally, Edward Snowden and Bruce Schneier (cryptography and privacy expert) recommend it, among others. Orgs that require sensitive data (such as investigative journalists and whistleblowers) have used it successfully for *years*. It's been audited dozens of times. So yeah, gold standard.

And yes it's open source. The clients and server are open source. It's not decentralized, but that's a different issue.