One of the properties of a hash function is irreversibility. But how is this possible? Is it really impossible, as in mathematics, to perform all the actions, only the other way around?

Question

Hashing

Sorry for the stupid question, I'm new. But how is it possible that the hash function is irreversible? Even if you can find its source. I don't understand.

Answer 1

Not all mathematical operations are reversible.
Here is the most primitive case for you: adding all the digits of a number, then adding all the digits of the result of this addition, and so on, until you get a number from one digit.
1234567 becomes 28, 28 becomes 10, 10 becomes 1. Now, try to restore the original "1234567" with only "1". Hash algorithms are, of course, more complicated, but their principle is the same: the hash itself cannot be used to restore the original information.

Answer 2

Try turning the minced meat back through the meat grinder and get a whole piece of meat)