See fcrackzip.txt (which is derived from the manpage), or fcrackzip.html There is a web page with more information at http://software.schmorp.de/pkg/fcrackzip.html http://oldhome.schmorp.de/marc/fcrackzip.html A sample password-protected .zip file is included as "noradi.zip". It's password has 6 lower case characters, and fcrackzip will find it (and a number of false positives) with fcrackzip -b -c a -p aaaaaa ./noradi.zip which will take between one and thirty minutes on typical machines. To find out which of these passwords is the right one either try them out or use the --use-unzip option. Marc