Computer security means protecting our computer systemand the information they contain

against unwanted access, damage, destruction or modification.

Security measures

Computer Threats

Computer Threats

Security measures

We need to protect our computer from?

• Hackers

• Crackers

• virus

TYPE OF COMPUTER SECURITY

HARDWARE SECURITY

SOFTWARE / DATA SECURITY

NETWORK SECURITY

TYPE OF COMPUTER SECURITY

1. HARDWARE SECURITY

• refers to security measures used to protect the hardware specifically the computer and its related documents.

• Example :

PC-locks,

Smart cards

Biometric devices.

BIOMETRIC DEVICES

2. SOFTWARE / DATA SECURITY

• refers to the security measures used to protect the software and the loss of data files.

• Examples :

Software - activation code and serial number

Data - backup data

2. NETWORK SECURITY

• refers to security measures used to protect the network system.

• Example:

Firewall

Router

Computer Threats

1

Virus or Worm designed to activate under certain conditions

A Virus or Worm designed to activate at a certain date/time e.g. Friday the 13th and Michelangelo ( March 6th )

A small door that coversan opening in a roof or floor.

Trapdoor

Trapdoor is malicious code that open a back door and allow other people to have unauthorized access to your computer over internet.

Trapdoor/BackdoorBackdoor is the most dangerous type of Trojans.

Backdoor is installed and launched without the knowledge of the user of the victim computer.

Backdoor functions can include:1. Sending/ receiving files 2. Launching/ deleting files 3. Executing files 4. Deleting data

Hacking refer to unauthorized access to the computer system by a hacker.

2

3

Computer is used to steal money and information.

Stealing of computers especially notebook and PDA.

4

Security measures

Plain Text Plain Text

Plain Textencryption

descryption

troops heading west need more supplies. send general dubois' men to aid

TIDIE MRNME REOGO SANOW RSLTP EEEDO SSSNU AHTUD BIENP GODAE PEIDE LNS

Plain Text Ciphertext

CiphertextPlain Text

cipher = secretplain = normal

Plain Text

FILE MANAGEMENT

DIAGNOSTIC UTILITY

FILE COMPRESSION

ANTIVIRUS

BACKUP

is a utility program that we use to protect a computer against viruses

A firewall is a software or hardware that secures a network, shielding it from access by unauthorized users.