Encoding vs Encryption Explained
A very common and dangerous mistake made by junior developers is confusing encoding with encryption. If you run a password through a Base64 Encoder and store the output in your database, your users' accounts are entirely compromised.
What is Encoding?
Encoding is simply transforming data from one format into another so it can be safely consumed by a different system. It provides zero confidentiality.
For example, Base64 encoding translates binary data into 64 safe ASCII characters. This ensures that an image file can be safely transmitted over a text-based JSON API without the control bytes breaking the payload structure.
There is no "secret key" required to reverse encoding. Anyone with the Base64 string can trivially decode it back to its original state.
What is Encryption?
Encryption transforms data using a complex mathematical algorithm and a secret cryptographic key. The resulting ciphertext is entirely unreadable to anyone who does not possess the correct decryption key.
Encryption guarantees confidentiality.
What is Hashing?
While encryption is a two-way function (encrypt and decrypt), hashing using a Hash Generator is a one-way function. A hash algorithm (like SHA-256) takes an input of any size and produces a fixed-size mathematical signature. You cannot mathematically "decrypt" a hash back to its original text. Hashes are used to verify data integrity and securely store passwords.