If you are struggling like me to crack the keys in time, use the following:
1. start encryption
2. make a screenshot of numbers by pressing PrtScr on keyboard, press Pause/Break on keyboard to pause the game
3. alt+tab and look the screenshot in ms paint by pasting it there (ctrl+v) and look for the numbers
4. than alt+tab back to game and unpause the game and enter the numbers you've found
5. repeat 2-4 again and again

Now you are a true hacker and your mother is proud of you. :)