This simple USB trick adds physical security to your PC without buying extra hardware.

I have all but moved on from password to passkeys, where possible, as a safer alternative to typing a long string of characters. But there's a caveat: if someone gains physical access to your computer ...

Add Yahoo as a preferred source to see more of our stories on Google. One of the best uses for your PC's empty USB ports is housing a USB security key. What this does is automatically lock your system ...