Comment by MisterMunchkin
8 hours ago
We found a cipher my dad had written as a child with no obvious key or anything. Chatgpt was able to crack it in 20 minutes and figure out the message, and we knew it was right because it mentioned names of children he went to school with.
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Caesar cipher is probably something even an untrained person could decode. Probably something more complex like a vigenere cipher that is still trivial to decode if you are at all familiar crptanalysis, but would look impossible to someone untrained.
Theoretically, with a long enough codeword to cipher ratio, vigenere is impossible to break (I think) (but sort of useless)
And yes, I've taught 8 year olds how to crack Caesar ciphers...
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It's good at poking holes at my galaxy brained newfangled ideas for ciphers too. I thought I had something good, pasted the ciphertext and got a "it was embarrassingly simple..."
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