A friend today asked me to bruteforce a zip file. I don't know anything about the password. So I began looking for some utilities...and I found Passware Password Recovery Kit. After 4 hours working on my quad core phenom2 3.4GHz it has crunched over 142.000.000.000 passwords....but still no luck with the right password! This utility claim to use GPU too but ATI is not used for this type of password recovery. Anyone using faster utilities? Is there something better than this? Now it's going at a rythm of about 4.000.000 passwords/second!