I'd like a link for GPG, as I have never gotten around to using it and would like to.
If you're on Ubuntu, then get out a terminal window and:
sudo apt-get install gpg
gpg --gen-key
Upload your key to MIT's keyserver
gpg --fingerprint
Add your fingerprint to Inputs.io
When you sign in, just type:
gpg --decrypt
And then paste the encrypted message into your terminal and press Ctrl+D. You should see a string of random text. Copy that into the decrypted text.