Internet Firewalls
The Internet is a complex web of interconnected servers and workstations that span the globe, linking millions of people and companies. But there is a dark side: The convenient availability of valuable and sensitive electronic information invites severe misuse in the form of stolen, corrupted, or destroyed data found therein. Compounding this problem is the unfortunate fact that there are ample opportunities to intercept and misuse information transmitted on the Internet. For example, information sent across telephone lines can not only be seen, but also can be easily manipulated and retransmitted, or software can be developed to do something as fundamental as deny Internet service. Preventing unauthorized access is a cost that should be factored into every Internet equation. What follows is an explanation of Internet security and the concept of Firewalls.Let's look at some of the most common security threats: Impersonating a User or System - To authenticate Internet users, a system of user-Ids and passwords is used. Anyone intent on gaining access to the Internet can repeatedly make guesses until the right combination is found, a simple but time con
Eavesdropping - By making a complete transcript of network activity, sensitive data such as passwords, data, and procedures for performing certain functions can be obtained. Eavesdropping is can be accomplished through the use of programs that monitor the packets of information transmitted across the network; or, less often, by tapping network circuits in a manner similar to telephone wiretapping. Regardless of technique, it is very difficult to detect the presence of an intruder. Public key technology uses the concept of digital signatures to assert that a named person wrote or otherwise agreed to the document on which the signatures appear. The signature is an unforgettable piece of data allowing the recipient, as well as a third party, to verify both that the document did originate from the person who signed it and that the document has not been altered since it was signed. A secure digital signature system thus consists of two parts: a method of signing a document so that forgery is unfeasible and a method of signature verification. Moreover, secure digital signatures cannot be repudiated; that is, the signer of a document cannot later disown it by claiming it was forged, since each digital signature is registered with a Certificate Authority. · Packet type - such as IP, UDP, ICMP, or TCP · Routing Re-Directions to identify access from unauthorized sources (unknown routers).
Some common words found in the essay are:
VPN Authentication, Authority Encryption, User System, Source TCP/UDP, Abuse Planning, Service Multi-user, Introduction Internet, Internet Firewall, Components Firewall, Filtering Rules, application gateway, packet filtering, pentium pro, application traffic, sensitive data, gateway servers, telnet ftp, dual pentium, transmitted internet, aceraltos product, packet sent ·, system packet sent, data transmitted internet, address system packet, sent · destination,
Approximate Word count = 2770
Approximate Pages = 11 (250 words per page double spaced)
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