In this era of communication, we can beam video streams, emails, and files around the planet in seconds. Although this makes sharing information brilliantly convenient, you can never feel entirely confident about what happens to the 1s and 0s going into the digital ether.

If you want to make sure that only your contact, and nobody else, sees the data you're sending, you need to hide it inside another file. This is actually pretty simple to do. Here's how to conceal sensitive information in a more innocuous guise.