Network problems Last week, we talked about 3 disadvantages of networks. What are they?

Network problems

• Last week, we talked about 3 disadvantages of networks.

• What are they?

Why Not Use Networks?

• The computer is vulnerable to hackers

• If the network breaks, many tasks become very difficult

• Your computer can more easily be attacked by a virus

Network security

• Why would someone want to attack your computer?

Why?

• To access your data

• To use your computer to attack other computers

Accessing your data

• What details could be stolen from you?

• For what purpose could they be used?

Spyware

• Collects personal data

• Collects internet usage history

• Often used for unwanted advertising

Unwanted advertising!

Fraud

• Using your personal data to steal money!

• Credit card details targetted.

Botnet

Storm Botnet

• Estimated: between 200,000 and 1,000,000 computers infected

• Estimated 8% of all malware on Windows

• Used for spam email

• Used to attack international banks

Kraken Botnet

• About 400,000 computers infected

• 50 Fourtune 500 companies infected

• Sends about 9,000,000,000 spam email messages/day

Srizbi Botnet

• Roughly 400,000 infected computers

• Estimated 60,000,000,000 spam emails sent/day

• Nov 2008 – controlling network taken offline– Global spam email decreased 75%

How is a computer attacked?

• What do you know?

How is a computer attacked?

• Port scanning

• Phishing

• Trojan

Port Scanning

• This is an active attack

• A hacker runs a program to find vulnerable spots in the network

• The hacker can then run another program to access your computer

Port Scanning

Port scanning protection

• Firewall

• Updates

Firewall

• A program that checks incoming data

• If it is not from a trusted source, the data is blocked

Updates

• The hacker must find a vulnerable program

• When a vulnerability is found, the company will patch the software

• The patch fixes the vulnerability

• The hacker can’t attack in that way

Phishing

• An attack through email or IM

• A fake link that takes you to a dangerous website

• The website can then run a dangerous program, or collect your information

Phishing Email

Phishing – How to identify

Phishing – how to prevent it

• Read emails and IM’s carefully

• Be suspicious of links

• Run ONE anti-virus program

Trojan

• A program that says it will do something, but does something else.

Sources of trojans

• Email attachments

• A downloaded program (.exe files, like cracks or keygens)

• Dangerous programs on the internet

Trojans – how to prevent!

• Don’t run a program you don’t trust

• Scan suspicious files with an anti-virus tool

• Run Windows as a user, not as administrator

If you have a virus

• Run ONE anti-virus program

• Run anti-spyware and/or anti-adware scans

• Update all programs!

Homework exercise

• Remember, there will be a quiz next week very similar to this exercise.

• If you have questions, ask!

Homework exercise

• Imagine you are the class teacher for your class. You must create a database of your students.

• Create a table in design view containing the fields you think are important. Remember to choose a primary key.

• Add data to the database. You can invent the data, it does not have to be true. Fill in 3 records.