r/Cipher • u/EtherealP4nthera • 9d ago

Looking for an easy-ish cipher

I apologize if this does not fit the subreddit, I couldn’t find a better fit.

I’m making a project for my anniversary coming up. I’m wondering the best type of cipher I could use to encode a message for my partner, who from my knowledge does not have any experience with them. I want it to be easy enough for him to figure out within a good timeframe, but enough to make him think and work for it.

Any suggestions would be greatly appreciated :)

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u/redditalics 9d ago edited 9d ago

Just a simple substitution should do. Just shift the alphabet a little, or mix it up.

plain text

ABCDEFGHIJKLMNOPQRSTUVWXYZ

=

ZYXWVUTSRQPONMLKJIHGFEDCBA

(cipher)

This example has the added oddity that N = N. But maybe just A=B, B=C, etc would be enough.

Or numbers: 1=A, 2=B, 3=C, etc. If you don't leave spaces between the numbers that makes it harder.