2

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
  • 48,443
  • 11
  • 116
  • 196
leg020
  • 21
  • 2
  • This might help https://crypto.stackexchange.com/questions/3791/what-is-safer-zipcrypto-or-aes-256 – Sango Oct 07 '19 at 12:47
  • I've closed this as a dupe since the answer to the other question includes the required resources saying that a plaintext attack is indeed possible, even if the question isn't directly about plaintext attack... – Maarten Bodewes Oct 07 '19 at 16:59

0 Answers0