Why does PGP no longer ask for random keystrokes?
The random keystrokes were necessary to generate random events, but newer PGPs acquire these events automatically. PGP 5.x and up for the Microsoft Windowses and Mac OS uses (the timing of) system events that go on all the time to constantly update the random seed file randseed.bin file. These events include disk access, keystrokes, mouse movements and other things that are reasonably random. If you check, you will see that the randseed.bin’s last modified date often changes, even if you are not using PGP. Under UNIX-like systems, PGP 5.x and GNU Privacy Guard use the output of the random device /dev/random when available, which gathers randomness in a similar way.
