Sound security isn't based on trusting a name. Show us the source if you expect to be trusted. I don't understand how Zimmerman still doesn't get that.
Phil Zimmerman fought back as best he could, coming out with updates to PGP, as they kept charging him with something for years until one day they dropped all charges. Now MIT where you downloaded PGP from, I don't. I've still got PGP 2.6.2 g which was released years before MIT sold out to NSA.
If you have to trust someone for me it would be Phil Zimmerman, just as I do (cough) Google.
There may be a flaw in my thinking :} but it's that or just quit the Internet, using a phone, or filling out forms.
The backdoors mentioned is old news and due to MIT. Now I don't trust cloud storage ( “Swiss cloud”).