Security

Question 1

Firewalls

Answer 1

• Sits between users computer and internet
• filters information
• examines traffic
• checking incoming and outgoing data
• prevents viruses and hackers entering users computer
• can block traffic
• keeps list of undesirable IPs

Question 2

Proxy Servers

Answer 2

• Acts as intermediary between user and web server
• allows traffic to be filtered
• using cache they can speed up acces to information
• keeps IP address secret

Question 3

Types of encryption

Answer 3

• Symmetric
• Plain text and Cypher text
• Authentication

Question 4

Symmetric encryption

Answer 4

• Secret key
• One key is needed to encrypt and decrypt on both ends
• increasing length of key increases strength of encryption

Question 5

Plain text and Cypher text

Answer 5

• Plain is before its encrypted, Cypher is output of an encryption rpogram

Question 6

How can it be applied

Answer 6

• Protect bank customers from fraud
• bank uses 10/12 digit unique code
• may be asked for 3 numbers in a random order of their 4 digit pin
• uses a hand held device for cards
• asks for key pats of the password to be inputed using inboxes