Security is a mechanism that assures any data stored in a system cannot be accessed without the authorization rights. Network securing is a protective mechanism for safe guarding the resources and the communication channels in the network. Copy the link given below and paste it in new browser window to get more information on Network Security:- http://www.transtutors.com/homework-help/computer-science/network-security.aspx

1. NETWORK SECURITY

2. What is Network Security
Security refers to techniques for ensuring that data stored in a
computer cannot be read or compromised by any individuals
without authorization. Most security measures involve data
encryption and passwords.

3. Security problems
Problem Description
Phishing Masquerading as a well-known site such as a bank
to obtain a user’s personal information, typically
an
account number and access code
Misrepresentation Making false or exaggerated claims about goods
or
services, or delivering fake or inferior products
Scams Various forms of trickery intended to deceive
naive
users into investing money or abetting a crime
Denial of Service Intentionally blocking a particular Internet site to
prevent or hinder business activities and
commerce
Loss of Control An intruder gains control of a computer system
and uses the system to perpetrate a crime
Loss of Data Loss of intellectual property or other valuable
proprietary business information

4. Security services
Network security can provide one of the five services as shown
in Figure. Four of these services are related to the message
exchanged using the network: message confidentiality, integrity,
authentication, and nonrepudiation. The fifth service provides
entity authentication or identification.

5. Message confidentiality
Confidentiality with symmetric key
Confidentiality with Asymmetric key

6. MESSAGE INTEGRITY
Routing
Message digest

7. MAC
MESSAGE AUTHENTICATION
HMAC

8. DIGITAL SIGNATURE
Signing the digest
Signing the message

9. ENTITY AUTHENTICATION
Challenge response using symmetric key
Password

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