Signal Security under Scrutiny: Encryption vs. Human Error

Signal has become the focal point of a heated discussion regarding its usage by US government officials, highlighting the limitations of the encrypted messaging platform.

In a surprising incident, Jeffrey Goldberg, the editor-in-chief of the Atlantic, accidentally gained access to highly confidential conversations among top US national security officials. He was mistakenly added to a Signal group chat that included US Defense Secretary Pete Hegseth and other senior defense personnel from the Trump administration.

The discussions in the group reportedly resolved around planned military operations targeting Houthi militant strongholds in war-torn Yemen. According to The Atlantic’s report, these exchanges continued for nearly a week before Goldberg voluntarily exited the chat. Meanwhile, other members seemed obvious to his presence. This security mishap has sparked significant concerns about the unauthorized use of Signal to handle classified discussions. A 2023 memo from the US Department of Defense(DOD) explicitly lists Signal as an unauthorized platform for sharing classified data. As scrutiny intensified, questions arose about the robustness of signal encryption and its overall security framework.

Is Signal Truly Secure?

Signal is widely regarded as one of the most secure messaging applications available today, setting a benchmark for encrypted communication.

Cybersecurity specialists consider it a leading choice for secure messaging, as no documented cases exist of hackers successfully breaching its end-to-end encryption protocol. Privacy advocates and digital rights organizations favor Signal due to its minimal data collection and advanced privacy settings, such as the ability to hide one’s phone number and use a username instead.

Unlike Telegram, Signal enables end-to-end encryption by default for all messages and calls. In January 2025, the platform introduced a new feature allowing users to migrate chat history and media from the last 45 days across Android and iOS devices or opt for a fresh start.

Signal’s encryption technology is open-source, meaning that experts can inspect its code for vulnerabilities. The same encryption protocol also secures other major messaging apps like WhatsApp. Signal has been upgrading its encryption algorithms since 2023 to prepare for potential quantum computing threats.

I wouldn’t say that Will and I are battling but I do disagree. Because there are big differences between Signal and WhatsApp.

Signal is the gold standard in private comms. We’re open source, nonprofit, and we develop and apply e2ee and privacy preserving tech across our system… https://t.co/ZU60z2vVHy

— Meredith Whittaker (@mer__edith) March 25, 2025

Best Practices for Secure Signal Usage

Although no correspondence platform is entirely risk-free, users can enhance their security on Signal by following these best practices:

• Prefer audio and video calls over text to reduce recorded conversations.
• Activate ‘Always Relay Calls’ in settings to mask your IP address during calls.
• Use personal devices rather than work-issued gadgets for Signal communication.
• Avoid connecting to untrusted networks to mitigate surveillance risks.
• Enable disappearing messages in Settings > Privacy > Disappearing Messages to automatically to automatically erase conversations after a set period.

While Signal remains a leading choice for private messaging, users must implement additional security measures to safeguard their communications against external threats.

Right now there are a lot of new eyes on Signal, and not all of them are familiar with secure messaging and its nuances. Which means there’s misinfo flying around that might drive people away from Signal and private communications.

One piece of misinfo we need to address is the…

— Signal (@signalapp) March 25, 2025