About Signal: The App Used by US Officials in Secret Chat
Messaging app Signal recently made waves when the White House disclosed that top US officials were using the platform for clandestine conversations.
The Atlantic's Editor-in-Chief, Jeffrey Goldberg, found himself unexpectedly included in a Signal group featuring US national security officials. Names like Defence Secretary Pete Hegseth and Vice President JD Vance populated the chat list, discussing potential military strikes against the Houthi group in Yemen.
On 24 March, Goldberg relayed in an article his initial disbelief upon being added to the chat. He thought the invitation "didn’t think it could be real". However, the US National Security Council later verified the authenticity of these discussions, with the Atlantic publishing related transcripts on 26 March.
The usage of Signal for discussing sensitive military operations and accidental inclusion of a journalist like Goldberg has sparked debates about the app's security measures against potential threats.
Democrat Senate leader Chuck Schumer described the leak as “one of the most stunning” intelligence leaks in modern history.
So, just what is Signal, and does it provide sufficient security for government and political figures?
Signal: A tool for secure communication
Launched in 2014, Signal is a complimentary, open-source messaging application. Despite having a smaller footprint with 40-70 million monthly users compared to giants like WhatsApp, the app is celebrated for its robust privacy features allowing users the freedom to "speak freely".
Journalists, activists, and government personnel gravitate towards Signal thanks to its commitment to security. The app supports texting, voice messaging, and video calls, and even allows for sharing media like photos and videos. It's also capable of handling group conversations of up to 1000 members.
A notable privacy feature is the ability to set messages to self-destruct after a certain period, which certainly bolsters user control over their own digital communications.
Robust security measures
Signal employs end-to-end encryption, courtesy of its bespoke Signal Protocol, ensuring that messages remain private; only the communicating users can view the messages, free from company or external interference. Moreover, the app eschews adverts and marketing partnerships, enhancing its security profile further.
The encryption, unlike in some other apps, is by default, eliminating the need for users to fumble through settings to secure their messages. Signal's strict privacy policy includes not storing sensitive information such as message content, call logs, or even contact lists, aligning with its minimal data collection ethos to minimise user data risks.
Following the media storm about the secret messaging saga, Signal's president Meredith Whittaker reinforced the app's commitment to privacy on X, emphasizing Signal as "the gold standard in private comms" highlighting their focus on open-source and nonprofit characteristics alongside rigorous application of encryption and privacy technologies throughout the platform.
Concerns over Signal's security
Despite its strong security features, concerns have been raised about Signal's vulnerabilities. CBS News reported on a security bulletin from the National Security Agency (NSA), dated back to February 2025, which highlighted potential weaknesses. The bulletin emphasised the app's attraction to entities engaged in surveillance and espionage, marking it as high-risk for intercepting sensitive data.
This report noted an advisory against using Signal or similar platforms for communicating classified information among NSA staff. These revelations came alongside ongoing investigations into how senior officials came to use such a platform for sensitive communications.
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