To use this app, you type in a message and scan a barcode. The message will be converted into a bunch of numbers. The only way to decrypt the numbers is to scan an item with the same barcode.

For example, you can buy a 6-pack of Coke. Then you take one can and encrypt the message. Assuming all the cans have the same barcode, you can take another can and decrypt the message.

NOTE: This app requires you to download the app Barcode Scanner if you don't already have it. If you don't, this app will redirect you there.