Computer Science

Computer Science

1. System Security

   • Malware-A virus is a small program designed to cause trouble by gaining access to your device.
   • Viruses-A virus is a type of malware that spreads through normal programs.
   • Worms-Spread from device to device, they don’t need to attach themselves to other programs. Can copy themselves hundreds of times, so they can very quickly harm your device and other devices.
   • Trojans-Pretends it will be a useful and safe program, when actually it will try to attack your device.
   • Spyware-Software that installs itself onto devices and then steals personal information about the user.
   • Ransomware-A type of malware that encrypts the user’s data and demands a ransom to unencrypt it.
   • Phishing-When an email is sent to someone which contains malware.
   • Brute force attack- A trial-and-error method used to obtain information such as a user password or personal identification number.
   • Network policy (what is it and what should it contain?) Network policies provide rules and guidelines on what network users can and cannot do. Most networks in large organizations will have network policies in place.
   • Encryption Files that are encrypted have been altered using a secret code and are unreadable to unauthorized parties.

2. System Architecture

   • CPU
     • Controls the other devices, executes the instructions and processes the data. It contains the ALU, CU and variety of registers
     • Fetch-Execute cycle

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