My contact form
The contact form is an easy and reasonably secure way to contact me. The message is encrypted in transit to the web server, but is then sent unencrypted locally from the web server to the mail server. That means that an attacker would need to listen on a local connection, or compromise the web server or mail server.
Note: To ensure you are communicating securely with the web server, go to https://lauritzt.dk/contact and make sure that your browser is displaying a padlock near the address.
OpenPGP is a public-key encryption system that can be used to send messages securely through another communication channel. It can be a little daunting, particularly if you choose a command-line interface rather than a graphical interface.
To decrypt the message, an attacker would need to get access to my private key (which is encrypted with a strong passphrase, and is only stored on encrypted and trusted computers), get access to your private key (if you gave it access to the message), or guess one of the private keys (something that probably won't be feasible until after 2030).
The client I recommend is GnuPG (optionally with Kleopatra as a graphical front-end). If you're using Windows, have a look at the Gpg4win project*. You can also use Keybase as a OpenPGP client, which is simpler to use, though it may be less secure.**
*Windows might not be secure, see the section about OS security.
**I'm referring to Keybase's web encryption interface. Keybase's servers could theoretically be serving malicious code to specific clients.
OS and hardware security
You should keep in mind that your applications, your OS, and your hardware may be monitoring your activity..
I recommend against using Windows to contact me if you need security. Instead, you can use TAILS.
TAILS is a live operating system. That means that it doesn't change the configuration of your computer and doesn't save any data on it. It runs from a USB-drive and lets you bypass the potential security problems of your regular OS or the applications installed on it. When you're done with TAILS, you simply remove the USB-drive and restart your computer, and you're back to using your regular OS. Learn more about TAILS.
If you need additional security, you can use my offline keys. The private part of the offline keys are stored on an encrypted and specially secured computer that is never connected to the internet.
Encryption for offline keys is just like encryption for regular keys – just select the offline key instead. You should yourself use a computer that is never connected to the internet (or a computer with TAILS).
It might take me longer to read and respond to messages encrypted for my offline keys.