Encryption and Protocols Flashcards
What is encryption?
The process of hiding a message so it can not be understood by anyone else
Why does data have to be encrypted?
So it is harder for hackers to get your data
What is non-encrypted text called?
Plaintext
What is encrypted text known as?
Ciphertext
What is a simple way of encrypting a message?
Caesar Cypher
what is caesar cypher?
moving each letter by a certain amount of letters
What are the two main internet protocols?
IP (Internet Protocol) and MAC (Media Accessing Control)
What is IP addressing
As a device connects its given a unique IP address. This address consists of four sets of up to three digits, each with a maximum value of 255, which are separated by dots
Do IP addresses change?
Yes - each time you change network
What is MAC addressing?
Assigning a unique number to each NIC
What is network layering?
Breaking up a message and sending in separate components
What are the 4 layers of network layering?
Application Layer, transport layer, Network layer and Link layer
What is the application layer
Codes/Decodes the message in a way it is understood by the user
What is the transport layer?
breaks down the message into small chunks (packets). Each packet is given a packet number and the total number of packets.
what is the Network layer?
adds the sender’s IP address
and that of the recipient.
What is the link layer?
enables the transfer of packets between nodes on a network
