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ZIPs tricks

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Command-line tools for managing zip files are essential for diagnosing, repairing, and cracking zip files. Here are some key utilities:

  • unzip: Reveals why a zip file may not decompress.
  • zipdetails -v: Offers detailed analysis of zip file format fields.
  • zipinfo: Lists contents of a zip file without extracting them.
  • zip -F input.zip --out output.zip and zip -FF input.zip --out output.zip: Try to repair corrupted zip files.
  • fcrackzip: A tool for brute-force cracking of zip passwords, effective for passwords up to around 7 characters.

The Zip file format specification provides comprehensive details on the structure and standards of zip files.

It's crucial to note that password-protected zip files do not encrypt filenames or file sizes within, a security flaw not shared with RAR or 7z files which encrypt this information. Furthermore, zip files encrypted with the older ZipCrypto method are vulnerable to a plaintext attack if an unencrypted copy of a compressed file is available. This attack leverages the known content to crack the zip's password, a vulnerability detailed in HackThis's article and further explained in this academic paper. However, zip files secured with AES-256 encryption are immune to this plaintext attack, showcasing the importance of choosing secure encryption methods for sensitive data.

References

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