**Full write-up:** [https://www.sebven.com/ctf/2021/08/23/corCTF2021-bank.html](https://www.sebven.com/ctf/2021/08/23/corCTF2021-bank.html)
Cryptography – 489 pts (25 solves) – Chall author: quintec
A new and upcoming bank called ‘CoR Bank’ is using the most recent cryptographic security, quantum cryptography! We even get a whole free dollar :). There is only one small problem for them, we are allowed to fidget with our qubits. And as usual, we are up to no good.