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Authentication is by far one of the easiest of the security services to implement, but many corporations limit their system and network security to user ID/password schemes. Many applications, whether they reside within an enterprise or at consumer sites, incorporate nothing more than a simple password or, worse yet, a four-digit PIN. It s easy to experience firsthand the best example of the risk incurred by companies that use inadequate authentication safeguards. All you have to do is to sit down at someone s computer who uses a certain travelservices Web site. One of the authors of this book did just that. It was a simple matter to go to the site and select the button Lost/Forgotten Password. Within one minute, the password was e-mailed directly to the user s account (which the author could easily open as well). Within all of five minutes, he could have purchased two round-trip tickets to the Caribbean. Even if an individual had to guess a password or a PIN to access the site as another person, it would take a day at most. In the digital age, with all the information provided in this book and others like it, no new technology is needed to greatly improve authentication security. The cost of an authentication token is nothing in comparison with the money that would be lost by a fraudulent purchase at such a site. Another example occurred recently at a medical center, where the system was hacked by an intruder who entered by using a common tool used by network administrators known as VNC (virtual network computing). Through the use of VNC, the intruder was able to enter the file system
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and gain access to various medical records. In all, the hacker accessed more than 4,000 cardiology patient records, 700 physical rehabilitation records, and every admission, discharge, and transfer record of the medical center within a five-month period. Without regard to internal security and the sensitivity of medical records, all this data was stored in the clear. But let s focus on the more important issue: how the network was accessed in the first place. VNC in its current incarnation has very limited authentication mechanisms (i.e., user ID and password). This means that intruders need only try a number of passwords before they gain access. In a case concerning medical records, you can easily see the losses add up. What if this sensitive data was released publicly across the Internet There is the obvious loss of patient confidence, as well as the very real possibility of lawsuits. Furthermore, what if the medical records were modified While it sounds like something from a movie, this could easily happen. With that said, proper authentication could have been observed in this case. True user ID/password schemes do provide authentication to a point, but as the sensitivity of the data increases so should the degree of authentication required. At the medical center, authentication would have been best provided for by requiring the use of client-side certificates or a onetime password token.
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Improper implementation can be seen in many examples of security breaches. The fact is that it isn t easy to implement security services using cryptography. Considerable time and effort must be taken to ensure that the newly implemented system is secure. One well-known bug, which was recently discovered, belongs to one widely used security application, which provides encryption and digital signatures to its users. In attempting to create a new key-escrow scheme (explained further in 6) that would be less intrusive to users, the application developers made a simple error. This simple error allowed for the possible disclosure of all data that had been encrypted using its new functionality. Furthermore, the integrity of any information, which was digitally signed by the software, could be destroyed. In this case, the actual dollar losses may never be calculated, simply because we do not know exactly when this bug was first discovered
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