Ultra Zip Password Cracker uses both brute force and dictionary-based attacks, as well as a combination of the two, to recover passwords from ZIP archives. It's optimized for speed, and it also allows you to interrupt the program at any time and save the current cracking status. This version features increased program performance: the brute-force attack is 20 percent faster for a Pentium II system; the 'known-plaintext' attack is 2,500 percent faster.