Challenge 24 ☆☆
Implementing cryptography can be very daunting. So there are various mistakes you can find on Twitter. What if our developers made the same mistake?
In this challenge, you need to find the HMAC key. Note that we created an HMAC following the spec from NIST step by step! Can you provide us the HMAC-key used to create the HMAC?
Sample message for keylen=blocklen
HMAC produced in Hex:
5FD596EE 78D5553C 8FF4E72D 266DFD19 2366DA29
What is the HMAC key used here?