Edexcel curriculum (2015)
Inside the CPU
LAN, WAN and PAN
The world wide web
HTML and CSS
Encoding vs Encryption
Encoding: convert into a coded form or a short hand form. E.g. WHU vs CHE means West Ham united vs Chelsea (not secure)
Encryption: scramble data in such a way that only someone with the secret code or key can read it. (secure)
The encryption process
A key is used to encrypt plain text into meaningless cipher text
The same key is used to decrypt the data back into its original form.
Only someone who knows the key can decrypt the cipher. If you don’t have the key you need to crack/hack the code.