Laura,
At this stage I can offer nothing more than my word. I am a
senior government employee in the intelligence community. I
hope you understand that contacting you is extremely high risk
and you are willing to agree to the following precautions before
I share more. This will not be a waste of your time.
The following sounds complex, but should only take minutes
to complete for someone technical. I would like to confir
out of email that the keys we exchanged were not intercepted
and replaced by your surveillants. Please confirm that no one
has ever had a copy of your private key and that it uses a strong
passphrase. Assume your adversary is capable of one trillion
guesses per second. If the device you store the private key and
enter your passphrase on has been hacked, it is trivial to decrypt
our communications.

Understand that the above steps are not bullet proof, and
are intended only to give us breathing room. In the end if you
publish the source material, I will likely be immediately impli
cated.

This must not deter you from releasing the information
I will provide.

Thank you, and be careful.

Citizen Four