Found 1907 Articles for Data Structure

Packet filtering is cheap to implement. It should be understood that a packet filtering device does not support the same level of security as an application or proxy firewall. All except the most trivial of IP networks is composed of IP subnets and include routers. Each router is a potential filtering point. Because the value of the router has been absorbed, more cost for packet filtering is not needed.Packet filtering is suitable where there are simple security requirements. The internal (private) networks of some organizations are not highly segmented. Highly sophisticated firewalls are not essential for isolating one element of ... Read More

Packet filtering is controlling access to a network by inspecting the incoming and outgoing packets and letting them move or halting them depends on the IP address of the source and destination. Packet filtering is one technique for implementing security firewalls.Packet filtering is both a tool and a method that is a fundamental building structure of network security. It is a tool in that it is an instrument that aids in accomplishing a function. It is a technique because it is an approach of accomplishing a task.In the framework of a TCP/IP network, a packet filter watches every IP datagram, ... Read More

There are various types of Proxy Server which are as follows −Forward Proxy Server − A forward proxy is a type of proxy server that generally passes requests from users in an internal network to the internet through a firewall.Forward proxies are configured to allow or deny the user's request to change through the firewall to create content on the Internet. If the proxy enable the user's request, it forwards it to the internet server through the firewall. The internet server sends its response to the proxy. The proxy sends this return back to the user.Public proxy − Public proxies ... Read More

A proxy server is an intermediary server that fetch data from an Internet source, including a webpage, on behalf of a user. They act as more data security boundaries securing users from malicious events on the internet.Proxy servers have some uses, and it is based on their configuration and type. Common uses contains facilitating anonymous Internet browsing, bypassing geoblocking, and regulating internet requests.Proxy servers enable users to browse the web more privately by changing your IP address and other recognizing data on the computer. Proxy servers maintain the personal data private, therefore the server does not understand who has create ... Read More

DMZ stand for the Demilitarized Zone. It defines a host or network that acts as a secure and intermediate network or path among an organization's internal network and the external, or non-propriety, network. It is called a network perimeter or perimeter network.DMZ is generally implemented to secure an inside network from interaction with and exploitation and access by outside nodes and networks. DMZ can be a logical subnetwork, or a physical network acting as a secure bridge among an inside and outside network.A DMZ network has limited access to the inside network, and some communication is scanned on a firewall ... Read More

There are many creative ways that unscrupulous people use to access or abuse unprotected computers which are as follows −Remote login − When someone is able to connect to the computer and control it in some form. This can range from being able to view or access the document to actually running code on the computer.Application backdoors − Some programs have unique features that enable for remote access. Others include bugs that supports a backdoor, or hidden access that supports some level of control of the program.SMTP session hijacking − SMTP is the most common approach of sending e-mail over ... Read More

A firewall can be represented as a specific type of network security device or a software program that monitors and filters incoming and outgoing network traffic based on a represented group of security rules. It facilitates as a barrier between inside private networks and outside sources (such as the public Internet).The objective of a firewall is to enable non-threatening traffic and avoid malicious or unwanted data traffic for securing the computer from viruses and attacks. A firewall is a cybersecurity tool that filters network traffic and supports users block malicious software from accessing the web in infected computers.Firewalls can be ... Read More

Kerberos is a network authentication protocol designed to support powerful authentication for client/server applications using secret-key cryptography. Kerberos provides the largest level of security to network resources.Kerberos was produced by MIT as a solution to these network security issues. The Kerberos protocol uses powerful cryptography so that a user can prove its identity to a server (and vice versa) across an insecure network connection. After a client and server has used Kerberos to determine their identity, they can also encrypt all of their communications to provide privacy and data integrity as they go about their business.Kerberos is openly accessible from ... Read More

PGP creates use of four types of keys including one-time session symmetric keys, Public keys, Private keys, and Passphrase based symmetric keys.Session key generation − Each session key is related to a single message and is used only for the goals of encryption and decrypting that message. Remind that message encryption/decryption is completed with a symmetric encryption algorithm. Considering that it is a 128 bit key that is needed, the random 128 bit numbers are created using CAST-128.The input to the random number generator include as 128-bit key (this is a random number using the keystroke input from the user) ... Read More

PGP includes the following services which are as follows −Authentication − The hash function used is SHA-1 which makes a 160 bit message digest. EP (DP) defines public encryption (decryption) and the algorithm used can be RSA or DSS.The set of SHA-1 and RSA supports an effective digital signature scheme. Because of the strength of RSA the recipient is guaranteed that only the possessor of the connecting private key can make the signature. Because of the strength of SHA-1 the recipient is guaranteed that no one else can create a new message that connects the hash code and therefore the ... Read More