Encoding is not encryption

A common mix-up

People often say "encoded" when they mean "encrypted". They are not the same.
Encoding changes the format of data so it can be stored or sent — it is not secret.
Encryption changes data so that only someone with the key can read it — it is secret.

Encoding like base64 is reversible by anyone; encryption needs a key to read

Base64 — a famous encoding

Base64 rewrites bytes using 64 safe characters. It is used to put images or files inside text (like email).

import base64
secret = base64.b64encode(b"hello").decode()
print(secret)            # aGVsbG8=
print(base64.b64decode(secret).decode())   # back to hello

Anyone can decode it — no key needed. So base64 hides nothing.

Why this matters for security

If a website "protects" your password with base64, it is not protected at all.
Real protection needs encryption (with a key) or hashing (one-way). Encoding is just a costume.

Try it

Encode hello to base64 below. Then imagine decoding it — and remember it is not a secret.

Covers: foundation for IGCSE 2.3 / A-Level 17.1 (encryption).

Common mistakes

Base64 is encoding — anyone can reverse it, so it gives no security.
Encoding changes the format; encryption protects the content.

Use base64 to encode the word hello. Encode its bytes and print the result as text. (Notice: anyone can decode it — encoding is not secret.)

import base64
message = "hello"
# encode message to base64 and print it as a string

Click Run to see the output here.

An app 'protected' a message as base64 — prove that protects nothing. Decode captured with base64.b64decode and print the text. No key needed.

import base64
captured = "YXR0YWNrIGF0IGRhd24="
# decode it and print the original text

Click Run to see the output here.