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Dye-sub printers use a heat-based process to transfer solid dye from ribbons or a sheet of plastic film onto specially coated paper. Before inkjet printing technology was refined, dye-sub was the technology to use for the best possible photo quality. Some experts think dye-sub prints still outclass inkjet prints, while other people lean the opposite direction. For the record, I don t lean either way both dye-sub and inkjet look darned good to me. However, if you re considering buying a dye-sub printer, be aware that you can t use these machines to print text documents, nor can you print on plain paper or specialty art media. Only the specially coated dye-sub media works. Dye-sub printers tend to be slow beasts, too. The paper has to pass through the printer multiple times because each dye color usually, cyan, magenta, yellow, and black is applied separately. Some printers send the paper through the works an additional time to apply a clear, protective overcoat. Most dye-sub models offered to consumers are snapshot-size printers and cost in the neighborhood of $200. You can find a handful of larger-format dye-subs, such as the $500 Olympus P-400, which can output prints at sizes of approximately 7 10 inches.

Part III:

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.

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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..

Before we delve further into this chapter, here is an overview of methods in SEO:

Laser printers turn data into print via a technology that involves a laser beam hence, the name. Instead of ink or dye, laser printers affix toner to the paper. You can print on plain paper as well as on glossy photo stock. Figure 9.2 gives you a look at one offering from the latest crop of lasers, the Minolta-QMS magicolor 2300W, which retails for $700.

A secret is a piece of information known only to one or more persons that is, something kept hidden from others or known only to oneself or to a few other people. To ensure secrecy, the data is encoded in a form that can be decoded only by the intended persons. Cryptology is the field of study underlying the development of new methods of encoding secrets (cryptology), and inverse methods to break those techniques (cryptanalysis). Cryptography involves the design of new ciphers and enhancement of existing ciphers, which are algorithms that convert the source data (plaintext) into a secret (ciphertext). The encoding process is known as encryption, and the decoding process is called

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