Unbreakable Encryption

Instructions

Pasted image 20220908145055

Solution

Ciphertext 1:

4fd098298db95b7f1bc205b0a6d8ac15f1f821d72fbfa979d1c2148a24feaafdee8d3108e8ce29c3ce1291

Plaintext 1:

hey let's rob the bank at midnight tonight!

Ciphertext 2:

41d9806ec1b55c78258703be87ac9e06edb7369133b1d67ac0960d8632cfb7f2e7974e0ff3c536c1871b

Ok, I found this script on github https://github.com/SpiderLabs/cribdrag.

I also found this explanation of crib dragging: https://samwho.dev/blog/toying-with-cryptography-crib-dragging/

Putting them together, I was able to "hunt" for the correct words in the message. I'm still not 100% sure how it works, I xor'd both the cipher texts together, ten ran the cribdrag tool against the result. Pasted image 20220908145241

Flag:

MetaCTF{you're_better_than_steve!}

Next: Et tu Hacker?