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computer science revision (malware- Malware is made to stop your device…
computer science revision
ASCII
The ASCII character set is a 7-bit set of codes that allows 128 different characters. ASCII is only used for the English language.
Unicode
Unicode uses between 8 and 32 bits per character, so it can represent characters from languages from all around the world. As it is larger than ASCII, it might take up more storage space when saving documents.
logic gates
NOT
output is opposite to input
AND
Both have to be on for output
OR
either has to be or for output
pixel
- a single dot of colour in a digital bitmap image or on a computer screen.
malware
- Malware is made to stop your device from running properly and sometimes to steal your information.
Viruses
A virus is a type of malware that spreads through normal programs. Once your device has a virus it may spread easily and quickly. A virus might just slow down your device
Trojan horse
A Trojan horse pretends it will be a useful and safe program, when actually it will try to attack your device.
Spyware
Spyware is software that installs itself onto devices and then steals personal information about the user, like passwords, email addresses and other important information.
Worms
Worms can spread from device to device, but unlike a virus they don’t need to attach themselves to other programs. Worms can copy themselves hundreds of times, so they can very quickly harm devices
