Information security is important – also when getting married. To ensure your wedding guests that it is indeed you getting married, you can – and should – use cryptography. When we got married about a year ago, we had PGP/GPG-signed save-the-date cards. See below how I created those (with code!).

Although I did more of the artwork than of the coding, I’d like to point you to an arduino-based wedding present which me and some friends made: Reverse Geocashing Wedding Gift Box.