The ZIP file format is a popular and convenient tool for combing multiple files into a single compressed archive suitable for sharing with others or simply archiving old files for safekeeping. ZIP files can be encrypted with a password for privacy and security, but it means that the files inside the archive are inaccessible if the password is ever lost or forgotten. Fortunately, there are ways to recover the password and FCrackZip is a free open source password recovery tool for Linux that is fast and capable of performing both dictionary and brute-force attacks against password-protected ZIP files.
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source:http://linuxpoison.blogspot.com/2010/12/135781677515531.html