by Dinesh Thakur Category: Security

A firewall is a device installed between the internet network of an organization and the rest of Internet. When a computer is connected to Internet, it can create many problems for corporate companies. Most companies put a large amount of confidential information online. Such an information should not be disclosed to the unauthorized persons. Second problem is that the virus, worms and other digital pests can breach the security and can destroy the valuable data.



 
by Dinesh Thakur Category: Security

Internet provides a two-way flow of traffic that may be undesirable in many organizations where some information may concern exclusively within the organization or for Intranet. Intranet is a TCP/IP network that is modeled after the Internet that only works within the organization. In order to delineate information meant only for the benefit of the organization or its Intranet and the other open to all or meant for Internet, some sorts of security measures need to be employed to control two-way flow of traffic. The measure known, as firewall is simply used for this purpose.



 
by Dinesh Thakur Category: Security

• Cryptography is a technique to provide message confidentiality.

• The term cryptography is a Greek word which means "secret writing".

 
by Dinesh Thakur Category: Security

• Computer Security means to protect information. It deals with prevention and detection of unauthorized actions by users of a computer.

• In simple words security is defined as "Protecting information system from unintended access"



 
by Dinesh Thakur Category: Security

To encrypt a file or other information stored in a computer means to convert it into a secret code so that it can't be used or understood until it is decoded or decrypted. You might want to encrypt a file if it contained a secret formula for a new invention, or some financial plans that your competitors would love to know about in advance. When you encrypt something, the computer will ask you to set up a password. After that, no one will be able to make sense of the information unless they have the same password.

Encryption hides your data from curious eyes. This is a process of encoding data to prevent unauthorized person from viewing or modifying it. The main features of data encryption are:



 
by Dinesh Thakur Category: Security

Network security can provide the following services related to a message and entity.

 
by Dinesh Thakur Category: Security

Network security is a broad topic with multilayered approach. It can be addressed at the data link layer, network layer and application layer. The issues concerned are: packet intrusion and encryption, IP packets and routing tables with their update version, and host-level bugs occurred at data link layer, network layer and application, respectively.

 
by Dinesh Thakur Category: Security

• Security Hash Algorithm (SHA) was developed in 1993 by the National Institute of Standards and Technology (NIST) and National Security Agency (NSA).

 
by Dinesh Thakur Category: Security

• Signature is the proof to the receiver that the document comes from the correct entity. The person who signs it takes the responsibility of the content present in the document.

• A signature on a document, when verified, is a sign of authentication; the document is authentic.

 
by Dinesh Thakur Category: Security

VPN (Virtual Private Network) Definition: VPN meaning that it is a private point-to-point connection between two machines or networks over a shared or public network such as the internet. VPN (Virtual Private Network) technology, can be use in organization to extend its safe encrypted connection over less secure internet to connect remote users, branch offices, and partner private, internal network. VPN turn the Internet into a simulated private WAN.

A VPN client uses TCP/IP protocol, that is called tunneling protocols, to make a virtual call to VPN server.



 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.