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Identification and Authentication
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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 (e.g., birth date, middle name, vehicle registration) or that are written down somewhere (e.g., 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. 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.
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Part III:
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Fingerprint systems have been shown to be weak because an imprint is left on the glass of the device a mould can be easily taken and used to produce fake prints that fool most devices. While these teething problems should be overcome with further research, it is always recommended to combine strong identification with strong authentication. The username and password combination can be greatly enhanced by the use of a one-time pad, to implement two-factor authentication. Here, a user is authenticated using the fixed user password when this is accepted by the system, it computes a second password that is not transmitted and is (say) time dependent. This password is also generated by a device or physical pad that the user carries with them. Once the one-time password is transmitted by the user, and she is authenticated a second time, the password becomes invalid. The password need not be time based a random or chaotic function could be iterated with a different seed or initial parameter to generate a fixed sequence of passwords for each user. As long as that function remains secret, strong authentication can be assured. One reason why these strong authentication measures are necessary is that usernames and passwords transmitted in the clear over a network can be intercepted by a malicious third party who is promiscuously reading the contents of packets from a network. Thus, if a sniffer application runs on a router between the client and server, the username and password can be intercepted. If the link cannot be secured by using a Virtual Private Network (VPN) of some description, or even a secure client such as Secure Shell (SSH), then a one-time pad is ideal all tokens can be intercepted because they are valid for a single session only; the tokens cannot be used to successfully log in a second time, because the generated password is invalidated once the first login has been accepted. Even if the link can be secured, a one-time pad is still useful because the client may not be trusted, and all keystrokes could be logged and saved for future malicious use. For example, keyboard listeners installed on Internet caf PCs could record username and password combinations and automatically e-mail them to a cracker. These would be unusable if a one-time pad were used because of the expiry time of the second factor.
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