I'm an assurer for CAcert.
Here is my current certificate.
Feel free to contact me if you want to be certified.
You can read a good
article on CAcert here (English)
Most of the time, I use PGP (OpenPGP, GnuPG) for encryption and
digital signing. You can fetch my public key from the PGP/GPG
keyservers, for example, here
Here is my key signing policy.