JohnTheRipper VS CyberChef

git clone "https://github.com/magnumripper/JohnTheRipper.git" && cd JohnTheRipper/src && ./configure && sudo make -s clean && sudo make -sj4

Use the pdf2john.pl command (part of the John the Ripper magnum pack) to create a hash for each pdf file.

John The Jumbo - Community enhanced version of John the Ripper.

To try this you need, time, the original python, (not python3, which wont work) Then you need to get the python script file named multibit2john.py

John the Ripper Jumbo has rules to:

Then we take the encrypted text and use CyberChef to decrypt it.

Let's go to CyberChef and insert our pieces of evidence.

A parameter was changed from '2AMBCgIQBg' to 'CgIIAdgDAQ%3D%3D' which is just the correct base64 encoding they should have been using the entire time.

I don't think this was a hostile action by Google, I think someone just added better input validation for security reasons and it accidently broke the bad requests they were sending.

https://gchq.github.io/CyberChef/#recipe=URL_Decode()From_Ba...

❗This is indeed the flag, but the text is encrypted with Base64. Usually, the presence of padding character "=" indicates that's Base64 type of encoding (but that's only one of the hints). To decrypt it, we can use CyberChef. Copy-paste the text and we either:

It uses a combination of magic bytes (like the `file` command), entropy analysis and character frequency detection to determine whether an output is likely to be of interest to the user.

The file type mechanism is written here[0]. There's a list of all signatures we detect here[1].

[0] https://github.com/gchq/CyberChef/blob/master/src/core/lib/F...

I think this can be deciphered using CyberChef...