Increase your Intelligence score by 1, to a maximum of 20.

You have advantage on Intelligence (Investigation) and Wisdom (Insight) checks when trying to discern crack ciphers and determine a hidden meaning from writing, language, gestures, etc.

You can ably create written, linguistic, and body language ciphers. Others can't decipher a code you create unless you teach them, they succeed on an Intelligence check (DC equal to your Intelligence score + your proficiency bonus), or they use magic to decipher it.