Why SHA256 Cannot Decrypt Passwords
One of the biggest beginner misunderstandings in cybersecurity:
trying to “decrypt” a SHA256 hash.
In this article
What Hashing Actually Does Hashing vs Encryption Why Passwords Use Hashes Common Developer MistakesWhat Hashing Actually Does
Hashing converts data into a fixed-length fingerprint.
Hello123
↓
7d3bbb5cbbc497d78ad547d8d39cbea2b3b8b69e...Same input → same output.
Tiny change → completely different hash.
SHA256 is designed to go ONE WAY only.
Hashing vs Encryption
Encryption:
Text → encrypted → decrypted backHashing:
Text → hash → game overThere is no “decrypt” button.
Why Passwords Use Hashes
Imagine if websites stored your real password directly.
One database leak and everybody cries together.
Instead:
password123
↓
hashed value
↓
stored in databaseDuring login, the website hashes your password again and compares results.
Common Developer Mistakes
- using SHA256 without salt
- thinking hashes are encryption
- storing passwords in plain text
- using MD5 in 2026 😄
For passwords:
use bcrypt or Argon2,
not plain SHA256.