The company behind the Signal clone Mike Waltz used has direct access to user chats

The communication app TeleMessage Signal, used by at least one top Trump administration official to archive messages, has already reportedly suffered breaches that illustrate concerning security flaws and resulted in its parent company imposing a service pause this week pending investigation.

Now, according to detailed new findings from the journalist and security researcher Micah Lee, TM Signal’s archiving feature appears to fundamentally undermine Signal’s flagship security guarantees, sending messages between the app and a user’s message archive without end-to-end encryption, thus making users’ communications accessible to TeleMessage.

Lee conducted a detailed analysis of TM Signal’s Android source code to assess the app’s design and security. In collaboration with 404 Media, he had previously reported on a hack of TM Signal over the weekend, which revealed some user messages and other data—a clear sign that at least some data was being sent unencrypted, or as plaintext, at least some of the time within the service. This alone would seem to contradict TeleMessage’s marketing claims that TM Signal offers “End-to-End encryption from the mobile phone through to the corporate archive.” But Lee says that his latest findings show that TM Signal is not end-to-end encrypted and that the company could access the contents of users’ chats.

Read more at Wired