the.com/hashing
turning any data into a fixed-length fingerprint that never reverses back.
means a one-way mathematical function that maps input of any size to a fixed-size output, so the same input always gives the same output but you can't work backward from it.
from from butchers hashing meat into small unrecognizable pieces, borrowed by computer scientists in the 1950s for scrambling data into fixed chunks, notably at IBM for fast table lookups.
password storagesites store hashes, never your actual password
collision problemtwo inputs can theoretically produce same hash
avalanche effectone changed letter scrambles the entire output
not encryptionhashing has no key, no way back