Boston Linux & UNIX was originally founded in 1994 as part of The Boston Computer Society. We meet on the third Wednesday of each month at the Massachusetts Institute of Technology, in Building E51.

Our Next PGP/GnuPG Keysigning Party

Our next Keysigning Party is scheduled for Wednesday, September 20, 2017 at MIT Building E-51, Room 315.


MIT Building E-51, Room 315, Wadsworth Street, Cambridge, MA


Wednesday, September 20, 2017 from 18:30 to 21:00

How to Participate

  1. Create a PGP or GnuPG key, if you don't already have one;
  2. Post your key to;
  3. Add your key to the signup list for the upcoming BLU Keysigning;
  4. Show up at the meeting with proper identification, to verify other participants' identities and to allow them to verify yours;
  5. After the meeting, sign the keys of participants who have proven their identity to your satisfaction.
To sign someone's key using GnuPG (example uses key ID D5C7B5D9):
  1. Retreive their key from the keyserver:
    • gpg --keyserver --recv-keys D5C7B5D9
  2. Sign the key:
    • gpg --sign-key D5C7B5D9
  3. Export the key to an ASCII-armored text file:
    • gpg --export -a -o D5C7B5D9-exported.asc D5C7B5D9
  4. Sign and encrypt the exported file so that only the key owner can read it:
    • gpg -sear D5C7B5D9 -o D5C7B5D9-signed.asc D5C7B5D9-exported.asc
  5. Email the signed file (D5C7B5D9-signed.asc) to the key owner.

Our next PGP/GnuPG Keysigning Party will be held on Wednesday, September 20, 2017. A key signing party is a get-together of people who use the PGP encryption system with the purpose of allowing those people to sign each others keys. Key signing parties serve to extend the web of trust to a great degree. Key signing parties also serve as great opportunities to discuss the political and social issues surrounding strong cryptography, individual liberties, individual sovereignty, and even implementing encryption technologies or perhaps future work on free encryption software.

The purpose of the meeting is to authenticate each other, i.e. verify everybody's key ids and key fingerprints. Participants sign each others' keys offline.

In order to complete the keysigning in the allotted time, we follow a formal procedure as seen in V. Alex Brennen's "GnuPG Keysigning Party HOWTO". It is strongly advised that if you have not been to a keysigning party before, you read this document.

It is essential that, before the meeting, you register on the signup form listed in the attachments. You should bring at least one picture ID with you. You must also bring your own printout of the report on that page, so you can check off the names/keys of the people you have personally verified.

Participants currently signed up:

SeqKey IDOwnerFingerprintSizeType
1 920063C6 John Abreau (Personal GMail 2013) A5AD 6BE1 FEFE 8E4F 5C23 C2D0 E885 E17C 9200 63C6 4096 RSA

Script to sign keys

The recommended tool for signing keys post-keysigning party is "caff", which can be installed on debian, Ubuntu, Fedora, CentOS, or Red Hat systems via one of

For Red hat and CentOS systems, the pgp-tools package is in the optional EPEL repo.

Previous Keysigning Parties

  1. September 21, 2016 :: Transposition Cyphers in Historic Context, and PGP/GnuPG Keysigning Party XVI
  2. September 16, 2015 :: Jeff Schiller and PGP/GnuPG Keysigning Party XV
  3. September 17, 2014 :: Crypto News, TOR, and our PGP/GnuPG Keysigning Party XIV
  4. September 18, 2013 :: PGP/GnuPG Keysigning Party XIV
  5. September 19, 2012 :: PGP/GnuPG Keysigning Party XIII
  6. September 21, 2011 :: PGP/GnuPG Keysigning Party XII
  7. September 15, 2010 :: PGP/GnuPG Keysigning Party XI, plus a talk by V. Alex Brennan
  8. September 16, 2009 :: PGP/GnuPG Keysigning Party X
  9. September 17, 2008 :: PGP/GnuPG Keysigning Party IX
  10. September 19, 2007 :: PGP/GnuPG Keysigning Party VIII
  11. September 20, 2006 :: PGP/GnuPG Keysigning Party VII
  12. August 17, 2005 :: PGP/GnuPG Keysigning Party VI
  13. September 15, 2004 :: PGP/GnuPG Keysigning Party V
  14. September 17, 2003 :: PGP/GnuPG Keysigning Party IV
  15. January 15, 2003 :: PGP/GnuPG Keysigning Party III
  16. December 19, 2001 :: PGP/GnuPG Keysigning Party II
  17. September 18, 1996 :: PGP and Electronic Privacy

BLU is a member of BostonUserGroups
BLU is a member of BostonUserGroups
We also thank MIT for the use of their facilities.

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