Posts Tagged ‘encryption’


Monday, February 6th, 2006

Puha. Endlich habe ich mich durchgerungen, mein E-Mail Konto mit dem Benutzernamen frers bei aufzulösen. Nachdem ich schon seit einigen Monaten nur noch eine Weiterleitung auf mein gmail / googlemail Konto laufen hatte, habe ich nun das Konto ganz gelöscht. Eine Bürde ist von mir genommen. Ungefähr 80% der Spammails, die ich über meine privaten E-Mail Adressen bekomme, gingen an die Adresse. Dazu kommen dann noch die ständigen, nervigen InformationsWerbe-Mails von – alles in allem: kaum zu ertragen. Das Webinterface ist auch penetrant.
Nun wünsche ich Google viel Vernügen beim indizieren meiner E-Mails… Wer das vermeiden will, kann die E-Mails ja verschlüsseln – entweder mit PGP/GPG (mein Schlüssel ist unten in der Seitenleiste verlinkt) oder mit meinem Thawte E-Mail Zertifikat (findet sich in meinen signierten Mails).

Some things aren’t easy even when they should be.

Saturday, September 11th, 2004

Motivated by an article in the most recent issue of c’t called Absender-Authentifizierung schützt vor Spam I decided to give it a shot and install certificates into, the default E-Mail programm for OS X. This was not exactly a trivial issue, but the goal was worth it: being able to digitally sign my e-mail and also use encryption. (I am an avid user of PGP/GPG encryption technology since the late nineties, but I also wanted to check out this alternative, since, sadly, very few people actually use PGP.) First I wanted to use the certificate provided by the German mail provider Since that did initially not work as intended, I checked an enormously helpful site called macosxhints. There I found quite a few tips that helped me tackle certification, signing, and encrypting issues in Mac OS X. Since I had problems with the certificates I decided to follow the advices on that macosxhints and got myself free personal e-mail certificates from thawte. After a few experiments I finally got the certificates installed: I had to use either Firefox or Mozilla to install the certificates into these browsers and then was able to ex- and import these certificates into the Mac OS X keychain, which is used by Mail, Safari and other Mac OS X native apps. After importing these certificates everything went as expected. For good measure I later installed the root certificates of , the DFN, and several relevant German universities.

Regarding the problems I had with the certificate: I did not install the root certificates when I first tried to use their certificate for signing purposes, which might be the reason why it did not work. Problem is, I was looking for a link to the root certificates in my personal options pages at but did not find anything. They weren’t even mentioned, even though I explicitly looked for them. One more thing regarding the c’t article gives a link to the TrustCenter, saying that under this link free certificates can be acquired. This is not true anymore. One has to have a account to get a certificate. (The account is free though – but I think the author thought registration for an account wasn’t necessary, otherwise it would probably have been mentioned.)

Fingerprints for all of my keys/certificates can be found at the bottom of the sidebar on this page.