Prompt: Meet ROXy, a coder obsessed with being exclusively the worlds best hacker. She specializes in short cryptic hard to decipher secret codes. The below hex values for example, she did something with them to generate a secret code, can you figure out what? Your answer should start with 0x.

0xc4115 0x4cf8

Based on the title and the prompt, we can be certain that we are dealing with Hexadecimal (base 16) values. The less obvious clue lies in the coder’s name, ROXy. Reversing the capital letters reveal XOR. With that info we know we need to use this to get the flag.

Using a XOR calculator (such as xor.pw) we can plug in each value and calculate the XOR of the two values. This will output “c0ded”. Formatting the flag the flag based on the prompt will give us the correct flag.

Flag: CTFlearn{0xc0ded}

Key Takeaway: Exclusive or (XOR) is a logical biconditional that yields true if the two inputs are the same. Provided with two values we can generate an XOR. XOR calculators are plentiful online.

Word Count: 182