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The question in a CTF was this:

They used two hydrogen atoms (H2) from the SHA-256 molecule to encrypt in some form of AES, and the result was as follows:

{mIT+GVt+p0YfgfOltHgqoetTS6h8bRSAScAGKrBE+g8TJfgsjeiX4/tloGU1In9j42l+zlAnI0+hmbgzpOEmKw==}

If the key length is short, they may have used that key twice

I could not work it out. How to solve this kind of question?

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  • Welcome to the community. Implying you know the flag format you could use the magic module in CyberChef. Commented Jun 19, 2022 at 10:35
  • two hydrogen atoms ... github.com/jedisct1/libhydrogen ? Commented Jun 19, 2022 at 21:54

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