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CS revision (Security (Authentication (Biometrics (Fingerprint scans,…
CS revision
Security
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Authentication
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Biometrics
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Bio-metric software scans face, voice, retina,finger. Image is converted to digital format Key features check against passport
DOS
Preventing users from accessing their emails, websites or online services
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Security protocol
TLS
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Ensures the security and privacy of data between devices and users when communication over the internet
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Ethics
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Freeware
Free to run, copy, change or adapt
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Binary, Hexadecimal, Denary
Uses of hexadecimal
MAC address, HTML, assembly language,
Conversions from binary to denary. Find 4 bit code for each digit and multiply by its value. Add totals together
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Conversions from denary to binary. Converts one number into 0s and 1s by division by 2. Remainder = 1, Without = 0
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Logic gates
NOT, AND, OR, NAND, NOR, XOR
Data transmission
Serial, Parallel, Simplex, Duplex, Half-Duplex
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Touch screens
Infra-red
Invisible grid on screen.
Sensor detect where the screen has been touched through a break in an infrared beam
The position is calculated
Good durability, allows multi-touch function
Capacitive
Current sent/flows out from 4 corners of the screen when finger touch, the current changes
Good visibility, durable surface
Resistive
Multiple layers of material that transmit electric currents
When the top screen is pushed/touched into the loer layer, the electric current changes and location of "touch:" is found
Inexpensive, can use gloved fingers