Summary Information Technology Theory

Module 2.2
Security Concepts
 Computer most vulnerable when communicating with other computers and when
connected to Internet
 Interceptions of communications
 Infection of your computer

Encryption
 Scrambling data into a new format using a key

Local encryption

 Use encryption software to protect files on your local storage
 Whole hard drive: enter key once
 Individual files: enter key each time you access files (better protection computer against
malware)
Automatic encryption

 Happens without you consciously choosing to use software to encrypt data
 User is not aware

Digital Rights  Software used to protect digital books, movies
Management  Control access to content
ATM  Data transferred between ATM and bank
 Protect sensitive financial data
Internet Browsers  Private data on Internet
 HTTPS protocol
Skype Calls
Online Storage Devices  Dropbox
 Not even employees of company can access files


Secure Sockets Layer SSL
 Confidential content
 Encryption protocol which encrypts data that is sent over the Internet
 Public key encryption

Private key encryption

 Single secret key
 Shared and kept private by sender and receiver
Public key encryption

 Mathematical algorithms to create two separate keys that are mathematically linked
 Private: decrypt
 Public: encrypt