 |
|
|
Glossary H What does "hashing" mean?Hashing is a common technique of speeding up access to a collection of data. It transforms a string of characters into a usually shorter fixed-length value or key that represents the original string. Hashing is used in large databases to speed up searching. For instance, suppose you have a huge database of names. To search for a given name is impractical because the computer has to search through millions of characters. It is faster to use a calculation that gives each name a short, unique indexing number. Whenever anyone adds a name into the database, a hashing algorithm (known as a "hashing function") assigns an index number to the name. These numbers are kept in a database array. When you search for a given character string (a name), the character string is turned into a number, and that number is compared to the existing list of numbers in the array. If it finds a match, the database then brings up the associated name. Hashing also has cryptographic uses. When you send an encrypted message, one hash algorithm works to scramble the message. The receiver gets both the scrambled message and a separate "key". The receiver then uses the key to decrypt the original message. A good hash function is quite difficult to decrypt. More detailed information is available at: http://WhatIs.techtarget.com/definition/0,289893,sid9_gci212230,00.html http://www.rsasecurity.com/rsalabs/faq/2-1-6.html What is Hotline?Hotline was originally a combination file transfer, bulletin board, and chat program. Though its original developer, Hotline Communications, has gone out of business, Hotline continues as an open source project with numerous server and client implementations. Hotline has a number of advantages over traditional protocols like FTP and IRC, not only because it combines several capabilities into one package, but also because it has a number of additional features. It supports resumed downloads, and many versions include a tracker for locating Hotline servers. A particularly attractive feature for Mac users is its compatibility with the Mac OS forked file structure. It is possible to store Mac OS files on a Hotline server without encoding them with MacBinary or BinHex. Also see:What is HTML, and where can I find a guide for creating HTML documents?HyperText Markup Language (HTML) is the formatting language for a hypertext or hypermedia document, viewable with a Web browser such as Lynx, Netscape Navigator, or Microsoft Internet Explorer. HTML documents are plain ASCII text and can be created with a text editor, but they contain formatting codes and links to other documents and media (including images and sounds) which can be followed using the Web browser. The following documents will help you get started in HTML:
Related online NETg tutorials (IU only)
HTML 4.0 Fundamentals If you haven't used NETg before, see the Knowledge Base document What do I need to know about accessing NETg from the Knowledge Base? Also see:
What is HTTP?HTTP, short for HyperText Transfer Protocol, is the
protocol for transferring hypertext documents that makes the
World Wide Web possible. A standard Web address (such as
For more information on HTTP, see the Internet Engineering Task Force (IETF) HTTP Working Group page at: http://www.ietf.org/html.charters/OLD/http-charter.html Also see:
What is HyperStudio? HyperStudio is a multimedia authoring program for the Mac OS and Windows platforms. While not as sophisticated as other multimedia authoring software, it provides a relatively easy-to-use tool for combining text, graphics, sound, and video in a multimedia product. HyperStudio is available from Roger Wagner Publishing, Inc. For more information about purchasing and using HyperStudio, see: At this Web site, you can download a free evaluation version of HyperStudio or request a free copy on CD-ROM. The evaluation version is identical to the full version, except that it limits the size of your completed files. You need HyperStudio Player to view HyperStudio projects. You can download a free player for Mac OS or Windows 3.1, 95, or NT at the HyperStudio Web site. You can also get a free plug-in for viewing HyperStudio projects at: http://www.hyperstudio.com/downloads/index.html#plugins What is the Happy Birthday/Showoff macro virus?The Happy Birthday/Showoff macro
virus reveals itself when you open a Microsoft Word file and a
dialog box appears which reads, "Happy Birthday! To one of us
peace!" Next, a menu button appears that reads
This virus appears to be a variant of the Concept macro virus. This Happy Birthday/Showoff/Concept type of virus adds macros to your Word files to produce the symptoms listed above. The Showoff macro virus contains the following macros: Ofxx AutoOpen AutoClose Cfxx AutoExec Show AutoOpenVir AutoCloseVir Variants may contain all or most of these macros. For more information, see: http://service1.symantec.com/SARC/sarc.nsf/html/WM.ShowOff.html Note: For information concerning protection from and removal of macro viruses, see the Knowledge Base document How do I detect and remove macro viruses? Also see:
|
Back tp
PC school
|