NETWORK SECURITY

2.  Definition of network and network security
 Objectives
 It’s history and types
 How it works and it’s components
 Security tools
 Network security technology
 Security protocols
 Implementation
 Current developments
 Future trend
 conclusion

3.  A Network is a series of points or
nodes interconnected by
communication paths.
 Interconnect with other networks
and contain sub-networks.

4.  Security is “Freedom from
risk or danger.”
 The ability of a system to
protect information and
system resources with
respect to confidentiality
and integrity.

5.  Any activities designed to protect
your network.
 Target-variety of threats and
stops them from entering or
spreading on your network.
 Handled by a network
administrator.

6.  Access
 Confidentiality
 Authentication
 Integrity
 Non-repudiation

7.  During the 1980’s , the hackers
and crimes were beginning to
emerge.
 CERT was created to overcome
network security issues.
 In the 1990’s , Internet became
public and the security concerns
increased tremendously.

8.  Physical security
 Perimeter protection
 User training and education
 Wireless encryption protocol
(WEP)
 Mac address filtering

9.  Anti-virus software packages
 Secure network infrastructure
 DNS hardware and software
 Virtual private network
 Identity services
 Encryption
 Security management

10.  Different mechanisms to deal with
these attacks.
 Cryptographic systems:
 Plaintext is converted into cipher
text :
 Secret key cryptography(SKC)
 Public key cryptography(PKC)

11.  We need multiple layers of security.
 Network security is accomplished
through hardware and software.
 Network security components:
 Antivirus and anti-spyware
 Firewall
 Intrusion prevention systems
 Virtual private networks

12.  A typical border control
mechanism.
 Metaphor for network security.
 Designed to prevent
unauthorized access to or from
a private network.

13. It is a short program aiming at
securing a communication over a
network.
Example:
Transport layer security(TLS)
Point-to-point protocol(PPP)
Internet protocols security(IPsec)

14.  Network security services(NSS)
comprises a set of libraries.
 It develops security-enabled client
and server applications.
Some are:
 Mozilla client products, including
firefox etc.
 Google chrome
 Sun server products

15.  Hardware developments:
 Biometric systems –secure
workstation logons
 Smart cards-undeniable proof of a
user’s identity.
 Software developments:
 Current research develops security
software using neural networks.
 Objective-use neural networks for
the facial recognition software.

16.  The network security will be able
to function as an immune
system.
 The same set of security
technology that is being used
today with some minor
adjustments.

17.  The network security field
evolve more rapidly to deal with
the threats further in the
future.
 “As threats tweaks,
 Security tremendously tweaks”