Humans: The Achilles’ Heel of Cybersecurity in Signal Scandal

Humans: The Achilles’ Heel of Cybersecurity in Signal Scandal

The short version

• The Trump Administration’s Signal Scandal: A journalist was added to a Signal group chat where senior officials discussed U.S. strikes in Yemen.
• Lessons Learned: The app’s encryption worked. The failure was in who was added and what was shared.
• Key Players: National Security Adviser Mike Waltz, Defense Secretary Pete Hegseth and The Atlantic’s editor-in-chief Jeffrey Goldberg.
• Future Implications: The episode put rules on messaging apps for government work under scrutiny.

A chat that went wrong

On March 24, 2025, The Atlantic’s editor-in-chief Jeffrey Goldberg reported that he had been added to a Signal group chat in which senior Trump administration officials discussed planned military strikes on Houthi targets in Yemen. Nobody hacked anything. A participant added the wrong person.

Inside the Signal chat

Goldberg said he was added by National Security Adviser Mike Waltz. The chat included Vice President JD Vance, Secretary of State Marco Rubio and Defense Secretary Pete Hegseth, among others. Hegseth posted details about the March 15 strikes, including timing and weapons, before they happened. The National Security Council said the message thread appeared to be authentic.

Signal itself is well regarded. Its end-to-end encryption kept the messages safe from outsiders. The trouble was using a consumer app for sensitive military planning and not checking who was in the group.

The case also raised records questions. Some messages were set to disappear, which conflicts with federal record-keeping rules.

Lessons Learned: Addressing Human Vulnerabilities

Security tools only work if people use them correctly. This case is a textbook example of human error defeating strong technology.

Agencies and companies can respond by setting clear rules for which apps are approved for which kinds of information, and by training staff to check participants before sharing anything sensitive. Approved channels for classified material exist for a reason.

Key Players: Responses and Reactions

The leak drew criticism from both parties in Congress, and several lawmakers called for investigations. Security experts noted that the National Security Agency had warned staff about Signal-targeting phishing by Russian groups weeks earlier.

Experts said training and policy enforcement matter more than which app is used. A secure app in a phone that is compromised, or a chat with the wrong member, offers no protection.

Future Implications: A Call for Enhanced Measures

The episode is likely to bring tighter rules on the use of commercial messaging apps by officials, and closer attention to record-keeping.

For other organizations, the lesson is cheap to apply. Write down which tools are approved for sensitive work and review group memberships on a regular schedule.

The human factor

Signal’s encryption did its job. A person adding the wrong contact undid it.

Every security program should plan for that kind of mistake, because it will happen. Simple controls such as checking a chat’s members before posting would have prevented this one.

Dan Evert, CCNP

Dan Evert is a self proclaimed Router Jockey. Dan got heavily involved in networking right out of high school and has never looked back! Dan is giving back by working with high school students to get them involved and interested in Networking and Security.