Algorithms · LESSON 7
What is a hash? — a text digest
A hash turns any text into a short, fixed-length "digest." That is what makes it perfect for sealing and verifying.
Concept
What is a hash?
A hash takes any text and turns it into a short, fixed-length value (64 letters and digits).
Same text→ always gives the same hash
Even one changed character→ gives a completely different hash
Not reversibleYou cannot recover the original text from the hash
Experiment
Try editing it
Edit the text below freely. Change one character and the whole hash changes.
Hash of this text
Even a tiny change shows up in the hash. So secretly altering sealed content is impossible.