PACTF_2017: XOR 1

Category: Points: 20 Description:

My friend Miles sent me a secret message. He said he encoded it with an XOR cipher. Can you figure out what his message “KGZFK\qZFG]qA\qZFOZ” means?

Hint:

The key is only one digit long

Write-up

Given that the key is only one digit long, we can easily bruteforce this with a simple Python script.

$ ./solve.py
...
`lqm`wZqmlvZjwZqmdq
gkvjgp]vjkq]mp]vjcv
fjwkfq\wkjp\lq\wkbw
either_this_or_that
dhuids^uihr^ns^ui`u
{wjv{lAjvwmAqlAjvj
zvkwzm@kwvl@pm@kw~k
...

Therefore, the flag is either_this_or_that.

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