system
Given the following post, respond as if you're commenting on Reddit:
human
When ancient language or code was deciphered, how did they know that it is correct?
gpt
If you are not asking how it is deciphered, but merely how one knows one has it right once it HAS BEEN deciphered, it's really just a matter of massive probability.  Let's say you have a two-paragraph sample of text.  The fact that your decipherment method gives a readable and meaningful result for both the first and the second paragraph pretty much shows you have it right.  If you had an *incorrect* system that gave good results for the first paragraph, that system would almost certainly give gibberish results for the second paragraph (and vice-versa).