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+--- Thread: HMAC-SHA256 PDF File (/thread-10233.html)
HMAC-SHA256 PDF File - scourge - 07-27-2021
Hello,
I would like to find an HMAC-SHA256 key for a PDF file, I have been studying hashcat but it seems just to allow 51Bytes strings. My PDF file is bigger than that. How can I deal with a PDF file to find its secret key? Is it possible or I´m losing some information about HMAC procedures?
This is what I understand from the procedure:
PDF File --> Calculate HMAC-SHA256 (key unknown)
So what I have to do is
Apply hmac-sha256 to my PDF file and a known hmac-sha256 value and bruteforce until I find the right key.
I thought that hashcat could help with that, any help is welcome!
Thanks for the help,
Best Regards,
SC