PicoCTF_2017: SmallRSA

Category: Cryptography Points: 120 Description:

You intercepted a single message. However, it appears to be encrypted. Can you decrypt it? Message

Hint:

Normally, you pick e and generate d from that. What appears to have happened in this case? What is likely about the size of d?

Write-up

This challenge is an implementation of Wiener's RSA attack. I would like to give credits to pablocelayes for his wonderful library for this attack. He saved me from doing math.

Script

Therefore, the flag is flag{Are_any_RSA_vals_good_95979862524}.

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