Open Source Java Password Crackers

Ophcrack is a Windows password cracker based on a time-memory trade-off using rainbow tables. This is a new variant of Hellman's original trade-off, with better performance. It recovers 99.9% of alphanumeric passwords in seconds.

Cracx allows you to crack archive passwords of any encryption using 7-zip, WinRAR or a custom command, via Brute Force or Dictionary attack. Note: You must NOT use this program with files you don't have the rights to extract/open/use them! Currently, the program requires a current version of either 7-zip or WinRAR to be installed, but you can also use it to bruteforce basically anything that is executably via command-line with custom parameters. On an i7 CPU, it runs approximately 30 combination tests per second. Feel free to make suggestions or contribute by implementing features and translating the tool into your native language!