The version of Signal that recently ousted national security adviser Mike Waltz was caught checking during a Cabinet meeting Wednesday is an unofficial edition of the app meant to archive messages, according to 404 Media. The archiving capability suggests that the app may not use end-to-end encryption, making it less secure than the standard version of Signal. In the images, published by Reuters on Thursday, there is a visible message at the bottom of Waltz’s screen asking him to verify his “TM