By Ben Gruber San Francisco, CA (Reuters) – Marc Newlin and Balint Seeber are checking how far apart they can be while still being able to hack into each other’s computers. It turns out its pretty far – 180 meters – the length of a city block in San Francisco. The pair work for Bastille, a startup cyber security company that has uncovered a flaw they say leaves millions of networks and billions of computers vulnerable to attack. Wireless mice from companies like HP, Lenovo, Amazon and Dell use unencrypted signals to communicate with computers. “They haven’t encrypted the mouse traffic, that makes it possible for the attacker to send unencrypted traffic to the dongle pretending to be a keyboard and have it result as keystrokes on your computer.