FTP Servers and Security - Three methods that Secure FTP Servers use
FTP (File Transfer Protocol) has been the basis for file transfer since the dawn of the internet. The truly remarkable feature about FTP was that it was operating system independent. Files could be smoothly transferred between Unix, Windows and any other operating system. The other cool feature about FTP was that a simple validation mechanism consisting of a username and a password could be used to limit access to files. However, the actual data itself was transferred unencrypted and it was easy to intercept and listen in on an FTP connection. The internet itself had very minimal security built into it. Consisting of many smaller independent networks that stretched across the globe, the path that a data packet took to get from point A to point B was unpredictable. With the popularity of the internet, it became essential to be able to transmit many types of critical data with some amount of security. Netscape Communications solved the security problem on the internet by developing the Secure Sockets Layer Protocol (SSL) which used public key cryptography to encrypt data transmitted over the internet. This is still the widely accepted security mechanism and is implemented by all web browsers. FTPS Secure File Transfer Modifications to the FTP protocol were proposed to incorporate the use of SSL for encrypting file transfers over the internet. The modified mechanism is referred to as FTPS. In order to maintain backwards compatibility with the original file transfer protocol, an FTPS connection could either be explicit, where the connection between the client connection and the server starts out as regular FTP and then negotiates a secure connection, or implicit where the connection starts out being encrypted. HTTPS Secure File Transfer Since a web browser is already capable of public key cryptography, simple downloads and uploads can be performed directly through a web browser using the HTTPS protocol. This means that special FTP Client software is not required. SFTP Secure File Transfer The Secure Shell protocol also known as SSH was developed by Tatu Ylonen to enable secure access to remote shells using public key cryptography and replace Telnet and other non secure shells. This protocol has since evolved to also support a file transfer mechanism known as SFTP. The main advantage of this mechanism is that it did not require the opening of an additional data channel connection for transferring files. All of these three methods of secure file transfer are based on public key cryptography and all of them are equally capable of securing the transfer of critical files across the internet. The only drawback of these methods is that there is a data overhead associated with encrypting files. There is also a performance overhead associated with encrypting the files at the source and decrypting them at the destination. Because of this, system administrators sometimes use regular FTP for file transfers within a secured internal network. However, for transferring files over the internet, this is a small price to pay in exchange for the guarantee that sensitive files reach their destination without being intercepted or tampered with.Okay, you now know about the three types of secure ftp servers. If you are looking for a secure FTP server to run on your windows system that can support all three secure file transfer mechanisms, be sure to visit <a href ="http://www.sysax.com/">http://www.sysax.com/</a> and download <a href ="http://www.sysax.com/download.htm?c=48#sysaxserv">Sysax FTP Server</a>
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The Key To Computer Security - Anti Virus Software
In the computer world today it is important to remember that at every second your computer is at risk of being contaminated with an ugly virus. There are many ways your computer may become infected from e-mail viruses to Trojans. These infections can cause damage to your hard drive, attach themselves to your programs, or can even spread to other peoples computers from your e-mail. It is essential to protect your computer from these invasions by using a good anti-virus software program. There are many different types of infections that can invade your computer some of which include viruses, worms, e-mail viruses, and Trojans. A virus can be transmitted from computer to computer by attaching itself to another program. When the program is running the virus is able to infect other programs or documents. Worms are a computer program that copies itself from computer to computer through the use of computer networks. They are often used to invade security holes in software programs. The latest computer invaders are e-mail viruses. An e-mail virus moves around in your e-mail messages and duplicates as it automatically sends itself to people in your address book, which in turn infects their computers in the same way. A Trojan horse invades your computer by pretending to be a program it?s not. When you open the program, the Trojan wreaks havoc on your computer that can cause irreversible damage. In order to protect yourself from such invasion it is very important to make sure your computer is safe. One thing you can do is to run a more secure operating system like UNIX that can protect your computer from traditional viruses. Another option is to buy virus protection software if you are using an unsecured computer. Avoiding programs from unknown sources, disabling floppy disk booting, and making sure that Macro virus protection is enabled, are also things that can further protect you from invasion. The best option for protecting your computer though, is to invest in an anti-virus program. There are many anti-virus programs like Norton antivirus, McAfee, and PcCillin, and some are even free like Avast and AVG. Anti virus programs work by keeping patterns of virus infected files and compares them to the files stored on your computer. If it finds any viruses you are immediately prompted to delete the contaminated file. Make sure to up-date your anti virus software consistently, which can be done through the Internet and most up-dates are free of cost. If you are going to use the computer it is always best to protect yourself and your precious memories from all the dangerous computer infections. When you invest in a good computer and store your information on it, you are setting yourself up for a potential disaster that many viruses can cause. It is essential that you make sure that your computer is always protected by investing in a good anti virus program. Dave Michaels writes on home and computer subjects. For more anti virus tips visit <a href="http://www.antivirustips4u.com">Anti Virus Program</a>
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