What is the difference between encoding and encryption?

Question

Accepted Answer

Encoding uses no key and is a static mapping (like ASCII); encryption uses a key to transform data securely.
This is a critical distinction:

Property
Encoding (Codierung)
Encryption (Verschlüsselung)

Key used?
No
Yes

Purpose
Represent data in a different format
Protect data confidentiality

Reversibility
Always reversible by anyone who knows the scheme
Only reversible with the correct key

Security
None — it's not a security mechanism
Provides confidentiality

Example: The word "Hallo" in different encodings:

Char
H
a
l
l
o

ASCII
072
097
108
108
111

Binary
0100 1000
0110 0001
0110 1100
0110 1100
0110 1111

Hex
48
61
6C
6C
6F

Important: In symmetric cryptography, plaintext, ciphertext, and keys are typically represented in hexadecimal (HEX).
Tip: Base64, ASCII, UTF-8 are all encodings — never treat them as encryption! A common beginner mistake is thinking Base64 "encrypts" data.

Property	Encoding (Codierung)	Encryption (Verschlüsselung)
Key used?	No	Yes
Purpose	Represent data in a different format	Protect data confidentiality
Reversibility	Always reversible by anyone who knows the scheme	Only reversible with the correct key
Security	None — it's not a security mechanism	Provides confidentiality

Char	H	a	l	l	o
ASCII	072	097	108	108	111
Binary	0100 1000	0110 0001	0110 1100	0110 1100	0110 1111
Hex	48	61	6C	6C	6F