Network Security

Network Security

1. DOS

   • It is where a hacker tries to stop users from accessing a part of a network or website. Most DOS attacks involve flooding the network with useless traffic, making the network extremely slow or completely inaccessible

2. Phishing

   • It i when criminals send email or texts to people claiming to be a well known business. When the user inputs this data into the website they hand it all to the criminals, who can then access their genuine account

3. Scareware

   • E.g. it tells the user their computer is infected with loads of viruses to scare them into following malicious links or paying for problems to be fixed

4. Worm

   • These are like viruses but they self replicate.They exploit weaknesses in network security

5. Viruses

   • Viruses copy themselves to certain files e.g. .exe files and autorun scripts. Users spread them by copying infected files and activate them by opening infected files

6. Trojan horse

   • Trojan horses are malware disguised as legitimate software, Trojans don't replicate themselves-users install them.

7. Spyware

   • It secretly monitors user action, e.g. key presses, and sends info to the hacker

8. Brute Force Attack

   • This is used to gain information by cracking passwords through trial and error.They use automated software to produce likely password combinations so using strong passwords can reduce the risk of this

9. Ransomware

   • It encrypts all the files on a computer. The user receives a message demanding a large sum of money be paid in exchange for a decryption key

10. Active Attack

    • It is when someone attacks a network with malware. They are more easily detected and the main defence against them is a firewall

11. Passive Attack

    • It is when someone monitors and intercepts sensitive information.They use network monitoring hardware and software such as packet sniffers.Th ebest defence against them is data encryption

12. Botnet

13. Insider Attack

    • Someone within an organisation who exploit their network access to steal information

14. Malware

    • It (malicious software) is installed on someone's device without their knowledge or consent