![]() I don’t know exactly what version of putty this is but we can use the CRC checksum to find out! All we have todo is download lots of old versions of putty and compare their checksums with the putty inside the zip.ħ-Zip (a ) 16.02 : Copyright (c ) 1999-2016 Igor Pavlov : ![]() I can use 7zip to open it and view its properties where we find it is encrypted using ZipCrypto and not the more common AES algorithm.Īdditionally and very conventionally the zip file also contains a very old version of putty. I have this old zip file which I do not know the password for. In a know plain text attack if you have the cipher text (encrypted zip file) and know some of plain text (a file inside the zip), they you can recover the key and extract all the files inside the zip! A worked example: This is a known text attack based on the pkcrack tool + A Paper by Dragos Barosan + The original vulnerability discovered back in 1994! By Eli Biham and Paul C. In this post I would like to highlight a really old flaw with the encryption used by the zip file format. Zip Encryption Known Plain Text Attack Posted on 05 December 2019 ![]()
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