Viliam_Bur comments on Stupid Questions March 2015 - Less Wrong Discussion
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How do I make a hash? In case I'm using the wrong word, I want to encrypt a message, then put the encrypted message in a public place, then decrypt the message in a way that proves that I actually encrypted a message (I didn't just write a nonsense string and later retcon an encryption scheme that makes it meaningful).
I think the correct words are "digital signature", and there is a free program PGP who should be able to do it. There is also an EnigMail extension for the Thunderbird mail client, which automatically signs e-mail and verifies e-mail signatures.
Sorry, I don't understand this topic well, so I can only give you these pointers.