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I have a Zip archive containing a single password-protected file file.txt. The encryption is "ZIP 2.0 Default Encryption" (ZipCrypto).

I know what kind of text (sentences) the "file.txt" contains.

  • Is it possible to use known-plaintext in that case? Or,
  • Do I need exactly a second known encrypted file to use this type of attack?
kelalaka
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leg020
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