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help needed with an encrypted zip file

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(@scott711)
New Member
Joined: 18 years ago
Posts: 1
Topic starter  

I have encountered a zip file with encrypted word documents in it. So far I have been unsuccessful in decrypting the file. I have tried using Passware with 2 different dictionaries, using the zip utility within Passware, the Password recovery toolkit. I have also been trying to figure out how to use a plain-text attack against it, but I am a little confused about the actual process of it. I know you need a unecrypted file to zip and use that file to attack the encrypted file. Is that right? I haven't been able to find a decrypted file with any data in it to use.

thoughts? Advice?


   
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(@olddawg)
Estimable Member
Joined: 19 years ago
Posts: 108
 

Which options did you run with passware? I've always had great luck using this program on zip files.

The options you use can make a huge difference. I recently cracked a zip file password in 29 minutes using Dictionary, Brute-force with Optimization and Brute-force. Passware recovered the password, finally, with brute force. To test Passware option efficiency, I turned off all options but brute-force, set priority to high and ran it again. It recovered the password in under 30 seconds.

How long have you let it run? Its just a matter of time…


   
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