Have you ever heard of Steganography?
A complicated word that describes how people hide information where other people would never think to look. It is a really useful way of sending information without it being intercepted, as there is very little chance it would be found.
It is the job of GCHQ to find the hidden messages that are being sent between criminals who are taking part in acts such as terrorism and serious crime, and then decipher them.
Steganography has been used many times in the past. For example, a roman emperor hid a message on the back of one of his servant’s heads, and when he sent his servant to the recipient of the message, the servants head was shaved and the message could be read. Another example is when, during WWII, morse code dots were written onto yarn which was knitted into a cardigan, and then unravelled when at the correct location.
Now, people are more likely to use digital steganography, and there are many ways of doing this, such as:
- Writing secret text in white in the spaces between words
- Hiding data inside a sound file
- Hiding data inside an image
Thank you to GCHQ for joining the Connect stream on Explore to teach us all about Steganography.
