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Murphy s Law states that anything that can go wrong will go wrong. Seasoned information technology security professionals will tell you that Murphy was an optimist. Reports of security breaches in computer systems are far too common. There are many threats, ranging from malicious programs such as viruses and spyware to hackers and thieves intent on stealing identities and anything of value they can get using a stolen identity or credit card. In fact, identity theft and credit card fraud are now the number one white collar crime in the United States (they re combined into a single category because one so often leads to the other). The ill effects of security breaches range from public embarrassment to losses that can amount to millions of dollars. In one of the more bizarre cases, thieves stole the identity of an elderly couple and sold their house while they were still living in it the couple found out when they were served an eviction notice. It took them months to straighten out the mess and restore their credit standing. A computer system is only as secure as its weakest component. Therefore, one must take a holistic approach to security and make every component as resistant to intrusion as possible. This includes securing the computer network, the servers on which applications and databases run, the operating systems on the servers, data les that contain the database data (including any backups), the DBMS, access to the data in the DBMS, and the client systems that connect to the servers and databases. Servers placed on the Internet with default con gurations and passwords have been compromised within minutes. Default database passwords and common security vulnerabilities are widely known. In early 2003, the Slammer worm infected tens of thousands of Microsoft SQL Server databases that had been set up with a default sa (system administrator) account that had no password. Oddly, the worst damage done by this worm was the loss of service when infected computers sent out hundreds of thousands of packets on the network in search of other computers on the network to infect, so it could have been a lot worse. If you think this cannot happen to you, think again. Here are some reasons security must be designed into your computer systems:
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Databases connected to the Internet or any other network are vulnerable to hackers and other criminals who are determined to damage or steal the data. These include the following: Spies from competitors who are after your secrets. Hackers interested in a sense of notoriety from penetrating your systems. Individuals interested in whatever they can obtain that has economic value. Disgruntled employees. (It seems odd that we never hear of gruntled employees gruntle means to make happy but only of disgruntled ones.) Zealots interested in making a political statement at the expense of your organization. The emotionally unbalanced and just plain evil people. Fraud attempts. Any bank auditor will tell you that 80 percent of fraud is committed by or with the assistance of employees. So, don t assume your system is immune just because the database is not accessible from the Internet. Honest mistakes by authorized users can cause security exposures, loss of data, and processing errors. Security controls keep people honest in the same way that locks on homes and of ces do. It must be understood that security precautions can never completely prevent the most determined adversary from breaching a system. The only way to completely guarantee that a system cannot ever be penetrated is to power it down and leave it that way. However, the right precautions can slow down even the most determined and talented adversary long enough to allow for detection and intervention. Above all, the use of layers of security at all system levels offers the best protection for valuable data resources.
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