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decryption. A large integer, known as a key, is central to the encryption and decryption process and, depending on the algorithm, a different key may be used for encryption and decryption. Algorithms that use only a single key for encryption and decryption are called symmetric, while algorithms that use two separate keys are known as asymmetric. An individual user usually wants to encrypt their own data and ensure secrecy from everyone else, in which case a symmetric algorithm typically suffices. The drawback for sharing data secretly with multiple users is that once the key is known to one unauthorized user, then all users data is compromised. This is where asymmetric algorithms come into play the encoding key can be compromised, but the data will still be protected unless the decoding key is known to an attacker, because the decoding key cannot be derived from the encoding key. Given that much data in defense, commerce, and government spheres must be kept secret, it s little surprise that cryptography is what most lay people associate with security. However, as you ve seen from the other requirements of security in this chapter, secrecy is only one part of the overall equation if data is inauthentic, inaccurate, and lacks integrity, then there s little point in keeping it secret. This section examines basic aspects of how both symmetric and asymmetric cryptography are used in modern applications to ensure secrecy of data.

In UNIX, a simple symmetric key encryption system is made available through the crypt command. crypt takes a passphrase entered on the command line and uses it to encrypt plaintext from standard input. The plaintext is passed through a stream cipher, and crypt then sends the ciphertext to standard output. Consider a simple example. Imagine that a list of secret agents names is stored in a flat-file database called agents.txt. To protect these identities, you need to encrypt the data and store the ciphertext in a file called agents.crypt. You also need to select an appropriate passphrase in order to protect the data in this case, use a random string of 78hg65df. Thus, to encrypt the file, you would use the following command:

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Internal architecture How the structure of the website affects the search engine s ability to index your site, and how you can modify the link structure to improve this. You do this by turning the site into a collection of themed sections. Keyword research How to use analytics to find the keywords that produce conversions at your site. You use the keywords in the selling proposition (USP). USP By knowing your website s business goal, you create a unique USP statement that lets you focus your efforts and lets your customers know why they should select you as the vendor. With a USP, you can write the various tags, headings, and body text. Meta tags The HEAD section of a web page contains three tags: the TITLE, DESCRIPTION, and KEYWORD tags. Use the keyword research and USP to write these tags. BODY tags The BODY section has the text that visitors see on their screen. You ll use the keywords and USP for the page heading and the introductory sentence. Sitemaps The two types of sitemaps are HTML and XML. We cover both of these and how they work. Issues in SEO (Ajax, Flash, spam, and so on) We provide a few notes about technical issues that can cause problems in SEO, along with some tips.

Engineered primarily as heavy-duty document machines, laser models have long been the leading technology for office printing, but in the past they have not rivaled inkjet or dye-sub machines for photo quality. Because imaging is becoming increasingly important in office settings, laser manufacturers are now paying more attention to photo-printing capabilities. Although photo quality still lags slightly behind inkjet and dye-sub output, it s getting closer to the mark every year. In fact, I daresay that if you weren t comparing prints from the various technologies side by side, you d probably be pretty satisfied with your laser photos. Color lasers don t come cheap, however; $700 is about the minimum you can expect to pay. Remember that you re buying a highly capable document machine for that price, not just a photo printer. In addition, most laser printers offer document collating, two-sided printing, networking capabilities, and other features that are important in an office environment.

Since the contents of agents.crypt would contain binary data, you could view the ciphertext using the following command:

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