In any task domain, users will have goals ranging from common to rare. Design your application to recognize this range.
Make common results easy to achieve
If a user’s goal is predictable and common, the user shouldn’t have to do much to achieve it. Unusual goals may require more effort to achieve. Stated more formally: The amount [...]
How your business approaches Web marketing depends largely on what you want to accomplish with the project. You can spend a ton of money establishing an impressive site with lots of features, but if all you’re after is a corporate presence, you’ll probably be wasting your resources. On the other hand, if you pinch every [...]
You may think this next section is somewhat out of place titled “The Internet and the Law”—we’re going to talk about much more than the legalities of international trade. If you are new to international (or even interstate) commerce, you should consult with an attorney before exploiting these new markets. There are some issues you [...]
A banner ad is a graphic advertisement, usually in the form of a GIF image, that appears on a Web site and is linked to a page on the advertiser’s site. Most banner ads measure 468 pixels wide by 60 pixels long and appear at the top of a page. Much smaller versions of banner [...]
Here are some of the questions to ask yourself and your online business partners in order to calculate your site’s exposure and plan its response to the risks associated with underage users:
Directed Attack over the Network
After more than a decade of computer viruses, PC users are beginning to appreciate the dangers of loading new software on their machines. A computer connected to a network, however, is subject to additional forms of attack, based on content and automatically installed software rather than user-installed software.
If you are running Fedora Core 3, SuSe 9, Mandriva 10.1 Debian, or Gentoo 1.4., you should not have any trouble using the Skype API. As previously mentioned, to write to the Skype API on Linux, you must have the D-BUS distributions. Once you have built the D- BUS components, you can update the /etc/dbus-1/system.d/skype.conf [...]
Can Users Access Different Databases?
I’m talking about different databases of information from the same tool, not necessarily different DBMS products. For example, a user may access the regular data mart stored on a local Windows NT server for most queries and reports and, by using the same tool, have access to this information:
Another department’s data [...]
Hardening is an important process, another way to harden the network is to use network access control (NAC). There are several different incarnations of NAC available. These include infrastructure-based NAC, endpoint-based NAC, and hardware-based NAC.
Infrastructure-based NAC requires an organization to be running the most current hardware and OSes. OSes such as Microsoft Vista has the [...]
Some types of asymmetric algorithms are immune to MITM attacks, which are only successful the first time two people try to communicate. When a third party intercepts the communications between the two trying to communicate, the attacker uses his own credentials to impersonate each of the original communicators.
Beware of the key exchange mechanism used by [...]
Without standards and protocols, a juggernaut like PKI would become unmanageable. For a real-life example, look at the U.S. railroad system in its earlier days. Different railroad companies were using different size rails, and different widths between the rails. This made it impossible for a train to make it cross-country, and in some cases, across [...]
Public Key Revocation
It is sometimes necessary to revoke a person’s (or company’s) certificate before the expiration date. Usually, revocation occurs when:
A company changes ISPs, if its certificate was based on its ISP’s Domain Name Server (DNS) name or its IP address, rather than the company’s own DNS name, or if the ISP had access to [...]
Movements of nodes in a mobile ad hoc network cause the nodes to move in and out of range from one another. As a result, there is a continuous making and breaking of links in the network, causing the network connectivity (topology) to vary dynamically with time. Since the network relies on multihop transmissions for [...]
Proactive protocols perform routing operations between all source destination pairs periodically, irrespective of the need of such routes. These protocols stem from conventional link state or distance-vector routing algorithms, and they attempt to maintain shortest-path routes by using periodically updated views of the network topology. These are typically maintained in routing tables in each node [...]
Remote Procedure Calls
All useful programs use subroutines to accomplish their function. The invocation of a subroutine is called a function call. It is obvious in languages such as C when subroutines are used. It is not so obvious that all languages, even the most advanced 4GL, use function calls extensively.
RPC provides the capability for any [...]
UNIX file servers are platforms dedicated to providing disk access for the network. UNIX networks provide access through a number of systems, variously called network file system (NFS) or remote file system (RFS).
NFS, the more comprehensive, providing the means not only to support file servers but to make all files on all UNIX platforms in [...]
The server will have considerable power to support a large number of users, each with frequent access for complex uses. Some configuration possibilities are:
Multiple gigabytes of disk
Very high processing power
64 MB or more of RAM
The actual disk space will depend on user needs. UNIX platforms support very large disk capacity.
Hosting Sever System Loss of Security
Whenever networks are added, especially when there is a complex interlocking network, security can be more easily compromised. In most cases, simple sign-on and the GRANT type security mechanisms become much less effective. Every organization that uses client/server should carefully determine security requirements and make sure that they are met [...]
Key Smart Sensor Features
Through my involvement with sensor networking standards development, I have noted key features that enable sensors to be used in smart sensor networks: unique identification, efficient and standardized communication protocols, automatic networking, self-test and self- calibration, self-describing (e.g., TEDS), self-locating, and time coordination.
A universal unique identification (UUID) code that takes the place [...]
Spectrum Management
As just mentioned, all wireless standards must be fully compliant with the government’s FCC rules, especially concerning carrier frequencies and output power. The FCC has established license-free industrial, scientific, and medical (ISM) frequency bands suitable for wireless- sensor systems.
One choice to be made in the deployment of wireless sensor networks is in the frequency [...]
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