$ ctf42

HMAC

Crypto weight 34.05 No technique tags yet.
Difficulty Not rated yet

Flag format: UDCTF{...}

There’s a secret message being HMAC-protected, but the implementation has a serious flaw. Can you recover the secret message using a side-channel attack?

SRC: https://gist.github.com/AndyNovo/91e3c51ef47980d32ad1cde26b917ac4

-Tery

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