Ars Technica- Like Nate Anderson's foray into password cracking, radix was able to crack 4,900 of the passwords, nearly 30 percent of the haul, solely by using the RockYou list. He then took the same list, cut the last four characters off each of the words, and appended every possible four-digit number to the end. Hashcat told him it would take two hours to complete, which was longer than he wanted to spend. Even after terminating the run two after 20 minutes, he had cracked 2,136 more passcodes. radix then tried brute-forcing all numbers, starting with a single digit, then two digits, then three digits, and so on (259 additional plains recovered).