1.4 Network Security

• Malicious software • Designed to cause malicious activity

• Replicate • Infect other computers • Delete files

• Disguised malware

• Self replicating • Slows computer

• Encrypted files • Demands payment

• Malicious code to manipulate databases

• Ability to obtain confidential information by people

• Unpatched software • Out of date anti-malware

• Securing data • Cannot be read without encryption key

• Packet inspection • Drops packets that are suspicious

• File management • Memory management • Multi tasking • User management • User interface

• Text based input • Interacts with computer

• Select from choices

• Windows • Icons • Menu • Pointer

• Signal sent to CPU • External device • Instruction that requires immediate attention

• External device connected to computer

• Device communicates with CPU via driver

• Name files • Allocate files • Move files • Save files

• Secondary storage copied to RAM for CPU to access • Management leaves allocated spaces for files

• Perform extra functions • Keep computer running efficiently

• Defragmentation • Data compression • Disk clean up • Anti-virus • Encryption

• Reorganising fragmented data within a storage medium • Reader does not have to search through as much data • Computer is more efficient

• Scrambling message • Only encryption key holders can decipher