Encryption (OCR GCSE Computer Science): Flashcards
📚Flashcards
Practise the cards
13 cards from this deck
ShowHide
Practise the cards
13 cards from this deck
Encryption
Encryption
Converting data to coded form so it can't be understood
Decryption
Decryption
Converting encrypted data back to original form using a key
Examples of data protected by encryption
Examples of data protected by encryption
Passwords and financial details
How encryption secures data during transmission
How encryption secures data during transmission
Scrambles it into unreadable format
Caesar Cipher technique
Caesar Cipher technique
Shifts each letter by certain number of places in alphabet
Caesar Cipher: 'A' shifted by 3
Caesar Cipher: 'A' shifted by 3
Becomes 'D'
Symmetric encryption key usage
Symmetric encryption key usage
Same key used for both encrypting and decrypting
Symmetric encryption: speed vs security
Symmetric encryption: speed vs security
Faster but less secure if key is intercepted
Asymmetric encryption key types
Asymmetric encryption key types
Uses two keys: public key and private key
Public key vs private key function
Public key vs private key function
Public key encrypts, private key decrypts
Why asymmetric encryption is more secure
Why asymmetric encryption is more secure
Only private key holder can decrypt the data
WEP vs WPA for Wi-Fi security
WEP vs WPA for Wi-Fi security
WEP older & less secure; WPA/WPA2 offer stronger encryption
What's needed to decrypt encrypted data
What's needed to decrypt encrypted data
The correct key