2.3 Encryption

-an algorithm is used to scramble data
-making the data unreadable during transmission

Plain Text

Cyphertext

State the purpose of encrypting data

Data becomes scrambled/unreadable.
If intercepted it won’t be understood

Symmetric encryption:

Data is encrypted and decrypted using the same key/algorithm
Encryption algorithm is used
Data before encryption is known as plain text
Data after encryption used is known as cypher text
Key is sent to receiver(to allow data to be decrypted

Asymmetric encryption

Asymmetric encryption was developed to overcome the security problems associated with symmetric encryption
Uses a public key and a private key
Public key is available to everyone
Private key only known by the computer user
Both keys are needed to encrypt and decrypt data

State differences between symmetric and assymetric

Symmetric has a shared key..
…to encrypt and decrypt
both the sender and receiver know the key
Asymetric has different kes (public + private)
…public to encrypt the data and private to decrypt
…anyone can know the public key but only those inteded know the private key

State similarities between symmetric and assymetric

They both use a key
They both scramble data
They both turn plain text to cypher text

Explain how data is encrypted using symmetric encryption

Data us encrypted and decrypted using the same key
plain text is encrypted into cipher text
Data is encrypted using an algorithm…
…that uses a key
The key can be generated using an algorithm
The key is transmitted to the receiver

State how SSL secures the data for transmission

It encrypts it
Uses digital certificates

The data for the web page is transmitted using SSL Fill in the blanks:

The web browser asks the web server to identify itself. The web server sends back its digital certificate. The web browser authenticates the digital certificate.

If it is authentic, encrypted data transmission begins