>Court Docs Show FBI Can Intercept Encrypted Messages From Deep State-Backed ‘Signal’ App
>Signal may be compromised.
>When phones are in partial AFU mode, Signal messages can be seized by federal authorities and other potentially hostile interests. GrayKey and Cellebrite are the tools typically used by the FBI to gain this sensitive information, an expert has explained.
Also from 2017:
>WikiLeaks Says the CIA Can “Bypass” Secure Messaging Apps Like Signal. What Does That Mean?