How to encrypt QR Code with java

Question

How do I encrypt a QR Code with java?

Now I can generate and decode QR code with java base but I want to know how to put a password on my qrcode to protect it or encrypt my qrcode with something

Has anyone done something similar or is there sample code available?

Thank you so much

Answer 1

You can put any data you like in a QR code. For example https://chart.googleapis.com/chart?chs=300x300&cht=qr&chld=M|1&chl=abc123 Will produce a code with the data abc123.

Once you have your encrypted data, you can then generate a QR code.

For example, this QR code https://i.sstatic.net/UsFdQ.png

Contains the message

-----BEGIN PGP MESSAGE-----

Version: GnuPG v1.4.5 (FreeBSD)

Comment: This is what your message looks like after encryption.

hQEOA1e+1x6YuUMCEAP+J/+0smoM/5aWiJZ7r+WsVKwbQ4xYJ1ftqGePeM5EnCAR

3d+Ai/4A3be615RFQ636RguSjJIKuoJCaHt/P6LH78ZX3xmOwucpmNYBCv1wN15X

gpdhOxtBnAx1aqI7sbrfTarKsZIY2Aqblgarq71dr0Kv7wCu1eGCg1YK7O2keOED

/AqTH8US94iceM9bRGIGk/SubV1e0Fw/kMc4J5wr2JHbifD+yNQvKIC87lQydLlC

2ZqOB2ed2OKsplB3zuoaWgV1skhRimLubehxkkJpiooKVVVnhVJh0w6kHWrYTV7T

MOSaduQBakPNoDUGIhvDkpU8N6uUs7F1xvr7vwoIim4C0kYBaDolzRjgmOq0QfvN

vF3Rc6ZlFqCfihpQgAAmboHa/uZxE0cP37UssaL6O0beLhCHWH/X8sUeEHmXEHLh

J+tL3EaO750a

=c8iI

-----END PGP MESSAGE-----

You may need to make sure there are line breaks when generating the data.

There is no way, that I am aware of, to password protect a QR. The best you could do is point it to a URL and then ask for a password on the website.