<- CRYPTOGRAPHY

Hextraordinary

1 minute to read

The challenge introduces us to ROXy, a coder that specializes in short cryptic hard to decipher secret codes.

We are given these hexadecimal values and we know that she has done something with them to generate a secret code:

0xc4115   0x4cf8

Actually, the name ROXy is a hint because she is using XOR cipher. If we operate both numbers using XOR, we get the secret code:

$ python3 -q
>>> hex(0xc4115 ^ 0x4cf8)  
'0xc0ded'

So the flag is: CTFlearn{0xc0ded}.