Quote:
Originally Posted by Vikesrock
It tries to crack the password using word lists and bruteforcing. Brute forcing a key that long would take about 10^20 years using a network of ~35,000-40,000 2GHz Athlon XP machines. Wordlists would likely not lower the time required enough even if words are used like last year, the key is too long and there are still a number of other characters in the key.
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Good statistic! You could shrink that number significantly if you equipped those computers with Nvidia graphics cards and off boarded the computation to them. But still, there is no way we are going to get past the encryption. 10^18 or 10^17 years are still a lot and definitely not worth it.
I don't remember how the PDF's are encrypted (Probably the highest level), but the lowest level of encryption can be broken in a day or two.