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Error starting job, please check file is valid. Digging into Zip file Password RemovalJohn the Ripper (a password recovery program) comes with a utility called zip2john that is used to extract the encrypted hash from the file.
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This hash is the key to the file. When attacking the file in an effort to “crack” the password you use this hash to try and find a matching known string.By attacking the hash it saves you having to type passwords into zip file password prompt millions of times, so getting the hash out is a good thing! As is the two most common password cracking tools, that being the aforementioned John the Ripper and Hashcat (also cudaHashcat). These are open source tools that are the worlds best at cracking password protected files and application hashes.