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An issue related to integrity is authenticity that is, given a piece of data that has demonstrated integrity, how do you know that it is authentic If multiple copies of data exist, and they all pass integrity checks, how do you know whether they are consistent with each other If multiple copies of a piece of data exist, and one or more copies are inconsistent, how do you establish which one (or more) copies is authentic The issues of authenticity and consistency are closely related in distributed systems.

How can you determine whether data is authentic The most common method is to authenticate the principal who is presenting the data The most common form of authentication is a username and password combination The username represents the identity of a specific principal, and is known publicly, while the password is a secret token that (in theory) is known only by the user In practice, users create passwords that can be easily guessed (eg, birth date, middle name, vehicle registration) or that are written down somewhere (eg, on a Post-it Note, a sheet of paper in the top drawer, or a whiteboard) If the password consists of a string of random characters of sufficient length that is equally probable as any other random string to be guessed, and if the password is secret, then the system works well.

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Defining sufficient length is sometimes difficult the UNIX standard for passwords is eight case-sensitive alphanumeric characters, while most ATM PINs are four digits Thus, there are 104 (10,000) possible ATM PIN permutations, while there are approximately 948 (6,095,689,385,410,816) possible UNIX password permutations UNIX authentication typically permits three incorrect logins before a delay of 15 seconds, to prevent brute-force attacks If an automated sequence of three login attempts took 1 second, without any delays, then a search of all possible passwords would take around 193,293,042 years Of course, there are potentially ways around this if the shadow password file can be directly obtained, then the search space can be partitioned and the generation of candidate passwords can be parallelized Using a good password-guessing program like Crack on a fast computer with a shadow password file can usually yield results within a matter of minutes or hours if passwords are weak.

There are more sophisticated mechanisms for authentication that revolve around two different strategies strong identification and strong authentication Strong identification typically means using an identifier that cannot be presented by anyone other than the intended user These identifiers are usually biometric iris scans, face recognition, and fingerprint recognition are becoming more commonly used as identifiers Of course, there are concerns that the strength of identification can be easily compromised an eye could be plucked and presented to the monitor, or its patterns transcribed holographically In these cases, the scanners are sensitive enough to detect whether the eye is living and will reject scans that do not meet this criteria Face recognition systems are very reliable with a small number of samples, but often have problems scaling up to identify individuals within pools of thousands, millions, or even billions of potential users..

All this work is not easy, but that s the point. People search for information and they want the best results. The search engines want to provide those results. The best pages will be at the top. We know, however, that many sites won t be able to do this. If you re selling handmade jewelry in Bombay or you re the webmaster for a small clinic in San Francisco, it s not feasible to write such articles. Many companies and organizations don t have the resources to write encyclopedia-quality articles. In that case, you can use PPC to place ads for your organization, products, or services in the search engines. By knowing your profits and costs, you can manage the PPC so it will be profitable.

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