Diagram of how TeleMessage archives Signal messages, based on my analysis of the source code Despite their misleading marketing, TeleMessage, the company that makes a modified version of Signal used by senior Trump officials, can access plaintext chat logs from its customers.In this post I give a high level overview of how the TeleMessage fake Signal app, called TM SGNL, works and why it's so insecure. Then I give a thorough analysis of the source code for TM SGNL's Android app, and what led me ...