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.
