Security and unintended leakage of information

[image of code keypad]

A security access keypad

An interesting aspect of online security is how information leaks out of systems in unintended and unexpected ways. The problem is not, of course, limited to online security – it exists in the physical world as well.

Here is an image of a security access keypad. It controls access to a private parking area at the back of my house.

Maybe not quite as secure as intended…