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Network security

Network security involves protecting computer networks from threats. It targets a variety of threats to stop them from entering or spreading on a network. The objectives of network security are access, confidentiality, authentication, integrity, and non-repudiation. As networks became more common in the 1980s and 1990s, security concerns increased and organizations like CERT were created to address issues. Network security uses multiple layers including firewalls, intrusion prevention systems, antivirus software, and encryption to secure networks from threats.

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NETWORK SECURITY
SUBJECT COMPUTER NETWORK TEACHER Sir Saifullah Memon
Define Network: A Network is a series of points or nodes interconnected by communication paths. Interconnect with other networks and contain sub networks.
Define Security Security is “Freedom from risk or danger.“ The ability of a system to protect information and system resources with respect to confidentiality and integrity.
Network security  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.
Objective • Access • Confidentiality • Authentication • Integrity • Non-repudiation
History During the 1980s, the hackers and crimes were beginning to emerge. CERT was created to overcome network security issues. In the 1990s, Internet became public and the security concerns increased tremendously.
Types Five types of network security can aid in secure networking. •Physical security •Perimeter protection •User training and education •Wireless encryption protocol (WEP) •MAC address filtering
 We need multiple layers of security  Network security is accomplished through hardware and software. Network security components: Anti-virus and anti-spyware Firewall Intrusion prevention systems Virtual Private Networks
Security tools •Antivirus software packages • Secure network infrastructure • DNS hardware and software • Virtual private network •Identity services •Encryption •Security management
Network security technology : Different mechanisms to deal with these attacks. Cryptographic systems: plaintext is converted in to cipher text.  Secret Key Cryptography (SKC)
• Public Key Cryptography (PKC): • Hash Function: Hash function Plain text Cipher text
 A typical border control mechanism.  Metaphor for network security.  Designed to prevent unauthorized access to or from a private network.
◦ Packet Filtering Firewall ◦ State Full Firewall ◦Application Aware Firewall etc.. Network-based IDs (NIDS): The sensor are located at the choke in network It monitored, it captures all the network traffic and analyze each packets for malicious traffic.
 It is a good level of security between a web browser and a website.  There is a tunnel between them.  Clients present a certificate to the server to prove their identity.
 prevention of unauthorized access using wireless networks. Security Policies:  Wireless Intrusion Prevention System(WIPS)  Wireless Intrusion Detection System (WIDS) Implementation: Three components: sensor, server, and console.
 It is a short program aiming at securing communication over a network. Example: Transport layer security (TLS) PPP / Point-to-Point Protocol Internet Protocols security (IPSec)
 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
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.
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.
Network security