To read the message, one need only stretch the band, and voila!
Using only a rubber band and permanent marker or ink pen, it is possible to encrypt and decrypt a text message using only the muscle power in your fingers.
Step 1: Let's stretch before begining
Take a rubber band that is wide enough to write on, and stretch it tightly around a flat surface. The surface could be a book, or in this case, a roll of duct tape. The tighter the stretch, the better the results.