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I'm trying to solve a problem where we are given a pubkey in a pem file (I assumed RSA and can unserialise it as such, so I guess I'm right) and a ciphertext, and we are supposed to crack it. One hint: "very short crypto"
My best guess is that the d value is very low, and it seems that there's a Wiener's attack that exploit it.
I found this code, but it fails when I apply it to my problem sagi.io/2016/04/crypto-classic
Any distinguished cryptographer to have a guess at what I'm missing here?

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