Behind the scenes of a Web-based email application is a database that stores the messages and allows each user to see his or her emails, folders, and address books. However, if attackers can fool the application into giving them direct access to the database, all the information stored in the database can be compromised. This [...]
A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. DoS attacks are fast becoming the weapon of choice for hackers. However, you can take the following measures to counter these attacks.
Disable unused or unneeded network services.
Maintain regular backups.
Create, maintain, and [...]
With clickjacking, the attacker overlays invisible malicious content on a page so that when the user clicks a link, he is actually clicking a URL under the hacker’s control. With banner ads, attackers deploy multiple redirects via a series of banner ads, eventually directing users to a site hosting malware, which is automatically installed on [...]
One of the many functions of SSL is providing for encrypted communications. Many attacks on SSL are designed to break the encryption by discovering the secret key used. Remember that SSL uses symmetric key cryptography to provide encryption. This basically means that the client and server each share the same secret key that is used [...]
Hackers can wreak havoc without ever penetrating your system. For example, a hacker can effectively shut down your computer by flooding you with obnoxious signals or malicious code. This technique is known as a denial-of-service attack.
Hackers execute a denial-of-service attack by using one of two possible methods. The first method is to flood the target [...]
The most difficult part of implementing a personal firewall is knowing what to block. The simplest answer is that you should block all unsolicited incoming traffic. This means that unless you are browsing a Web site or making a purchase over an SSL-enabled Web site, you should block incoming traffic you have not initiated. In [...]
We have already discussed lots about the Firewall , lets discuss what are Firewall Appliances .Small hardware appliances (devices that are separate from your computer) that you can connect and configure are available on the market, although they’re not as popular with home users as software products are. Appliances enable remote management of small remote [...]
Previously we discussed the way Firewalls works. Now lets discuss the Firewall Tools that are available on the Internet. There are many tools available, each having its own set of features. You can choose whatever is appropriate for your network.
• Using Freeware and Shareware Products
• TCP Wrappers
• The TISFirewall Toolkit
• SOCKS
• [...]
Computers communicate by sending electronic messages to each other. On the Internet, millions of computers send messages back and forth, so each computer on the Internet has a unique address, called an IP address, that’s used to distinguish that computer from all the others. When a message is sent from one computer to another, it’s [...]
A firewall is an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system. It is also a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all computer traffic between different security domains based upon a set of rules and other criteria.
Software Firewalls
A software [...]