Contacting David Benfell

Updated November 12, 2018.

I am David Benfell. My identity is established on My vcard is available here.

There are numerous ways of reaching me, with varying degrees of security.

Directory of more secure means

I am accessible through, now, only two end-to-end encryption technologies. In addition, all web traffic to this server may be protected with a SSL certificate issued by a generally recognized authority. The web security rating of this site or of any site may be checked using the Qualys SSL Labs SSL Server Test.


Signal and Telegram on smartphone; susceptible to traffic analysis

+1-707-861-2121 and +1-707-824-1194 - these services use one's regular cell phone number. Please note that there are difficulties obtaining a desktop client for Signal on the platforms I run.

Secure Communication

The most secure known communication programs are encrypted peer-to-peer with no central authority. Unfortunately, my current setup supports these poorly.

Encrypted, But Less Secure Communication

These means are vulnerable to traffic analysis.


I am on Skype as greybeard95a, but I rarely run it, it almost certainly has a backdoor, and it should not be used. Signal (both voice and SMS) and Telegram are encrypted end-to-end, using my normal cell phone numbers, +1-707-824-1194 and +1-707-861-2121.

If I do not know you, it is probably best to contact me via a social network I use often such as Facebook (my profile).


If you wish to send me an e-mail, and I already know you and will recognize your name, make sure that it appears in the From: header of your email to This is a normal configuration detail and should present no difficulty in the majority of cases. Messages may be encrypted using my long-established key. Please be aware the my mail is now hosted using Google's G Suite and I use FlowCrypt to handle cryptography.


Candorville, May 14, 2016, via GoComics, fair use. My cell phone numbers are +1-707-861-2121 (try this number first) and +1-707-824-1194. I will block telemarketers and other nuisance callers. My phone numbers are all listed on the National Do Not Call registry. I have voicemail turned off; it should not be offered to you. I rely on Caller ID to know whose calls I should answer and whom I should call back; if I do not recognize you and am not expecting your call, I will probably reject it.

My snail mail address is:


321 S. Main St. #12
Sebastopol, California 95472