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The need for web-based authentication is necessary so that any user running any platform can gain access to the wireless network. Apache (open-source) web server is designed to securely handle this task. The server implements Secure Sockets Layer (SSL) for client/server public-and-private key RSA encryption. Connecting to the web server via HTTP automatically redirects the client browser to use HTTPS. This ensures that the username and password entered by a user will not be sent in clear text. To further increase security, the SSL certificate is signed by VeriSign, a trusted Certificate Authority (CA), which assures that an attacker is not imitating the web server to retrieve a user s password information. A website is set up where a user can go to type in their username and password information. This site displays the standard government system access warning and shows the IP address of the user s system (using PHP). Once a user has typed their username and password at the website where prompted, a Perl/CGI script then communicates with a RADIUS server with RSA s MD5 digest encryption to determine if the information submitted is correct. If the account information matches what is in the RADIUS database, then commands to allow their IP address, obtained through the Apache environment variables, are added to the IPF access rules. If the user is not found in the RADIUS database, or if the password entered is incorrect, a web page stating

(Irrespective of platform, Apache code uses / as the separator character for directory pathnames) The installer program will have filled in the value for ServerRoot The next two directives identify files used for housekeeping data such as the scoreboard file that is employed on systems that don t support shared memory segments The next few directives set values for controls such as the timeouts on connections, and limits on the number of requests a child process can handle The Linux/Unix file will have directives that set the limits on the number of server processes, number to create at startup etc; the Windows configuration file will simply have a limit on the number of threads in the second process (this is effectively the equivalent to the MaxClients control).

where R is the number of transmitted OFDM symbols and sr(t) is the baseband signal representing the rth OFDM symbol occupying a symbol interval of length TOFDM. Let fr be the carrier frequency corresponding to the sub-band in which the rth OFDM symbol is transmitted. The carrier frequency fr hops between bands according to a time frequency code (TFC) of length 6. Therefore, fr is periodic with period 6. The system speci es four 3-band TFCs and two 2-band TFCs. Table 12.2 shows the TFCs for three lower sub-bands (group 1). By using these sequences, four simultaneously operating piconets can coexist with minimal

For visible transitions of gaseous species at room temperatures, fDoppler , is in the GHz range. Much narrower resonances can be detected if saturated absorption techniques are used to probe the narrower Doppler-free line. With saturated absorption spectroscopy it is possible to lock the frequency of the laser to better than 100 Hz [95].

If you will be running your Apache system on a typical home PC (Linux or Windows OSs), you will probably want to reduce the values for all those parameters The Linux/Unix file next contains a single example related to the setting up of shared objects dynamic linking in the Unix world The corresponding section in the Windows httpdconf file is longer; it has commented out LoadModule directives for important optional modules For example, if you want to support requests concerning the server status, you should uncomment the LoadModule status_module directive The next group of directives, starting with the Port 80 directive, set parameters for the Apache chief If you are setting up a real httpd process on Linux, you may need to change the values in the User and Group directives, and you will also need to specify your email address in the ServerAdmin directive.

Most job seekers post their r sum s on Web sites without giving the action a second thought. More sophisticated job seekers know that it s not always the best thing to do. It s true that the ability to upload your r sum to an online r sum database (a.k.a., r sum bank) is an extremely beneficial feature of online job hunting. Your r sum ends up working for you 24/7. Employers are either given access to the r sum banks to search

These simply ask the respondent to evaluate the subject according to a scale. These are very popular in political circles when people want to know how opinions are shifting between surveys. Used as isolated responses they are sometimes more useful as public relations ammunition than throwing any definitive light on a product s potential success. Figure 2-4 gives an example.