Living the Web 2.0

Posted by arlene

Follow these precautions to avoid hooking up with a cyberstalker in a chat room:

Posted by arlene

Various e-mail providers offer an instant messaging service that allows members to talk to each other when they are online. This can be great fun—just ask my friends who constantly harassed me—but it also can attract unwanted communication from outside your circle of friends.

Posted by arlene

Normalization provides numerous benefits to a database. Some of the major benefits include the following :

Greater overall database organization
Reduction of redundant data
Data consistency within the database
A much more flexible database design
A better handle on database security

Posted by arlene

Views can be utilized as a form of security in the database. Let’s say you have a table called EMPLOYEE_TBL. The EMPLOYEE_TBL includes employee names, addresses, phone numbers, emergency contacts, department, position, and salary or hourly pay. You have some temporary help come in to write some reports; you need a report of employees‘ names, [...]

Posted by arlene

The system catalog contains a variety of information accessible to many users and is sometimes used for different specific purposes by each of those users.
The system catalog contains information such as the following:

User accounts and default settings
Privileges and other security information
Performance statistics
Object sizing

Posted by arlene

Firecracker is device which can turn your computer into my house into automatic control. It remote controls the lights. Monitoring the dead corners is not that difficult any more. Active eye is a high technology motion sensor which monitor the all the area which the eye has been covered. This device is used to detect [...]

Posted by arlene

Once you have realized the potential savings in time and expense which even average use of the Internet can deliver, you will be keen to get started. The process of getting online is not difficult, but as you will discover, once you are connected you may well have to change the entire way you do [...]

Posted by arlene

The high tech cameras have been designed with high clearance and enhanced pictures. The current market cameras can be small like a penny. Spy cameras not necessary to look like a camera; it can be any kind of practical office or home accessories.
Cameras made for security combines certain convenient digital functions. The advanced recording technology [...]

Posted by arlene

Sensory alarm is more than a simple alarm. It has been designed with the latest high technology. Because it is alarm, it still works as basic alarm by sending the receiver the alarmed signals. The traditional alarm system won’t tell what kind of alarm is sending out. The high tech improves the limitation by programming [...]

Posted by arlene

For a small business, collecting payments is a crucial issue, especially in the early days when budgets are tight and continuing bad debts could make the whole venture unfeasible. The security devices described above go a long way to making online payments as secure if not more secure than traditional trading, as in most cases [...]

Posted by arlene

What to do if the hackers get in
In spite of all your efforts, a hacker may still manage to break into your system. When this happens, you must first assess the damage. Hackers often break into a system just to prove they can do it, and they may not cause any serious trouble or steal [...]

Posted by arlene

From a technical side, you need to assemble both proper software and reliable service providers and integrate them into your existing business systems in order to make effective use of business e-mail:
How much e-mail traffic can you expect? The answer to this query will direct how much bandwidth you arrange for your company. Underestimating can [...]

Posted by arlene

From a security or network administrator’s point of view, the very same features that make Skype connect reliably through a restrictive firewall present a challenge to preventing or blocking Skype traffic on a network. Skype is very robust and can function with access to only port 80. Most corporations allow outbound Web traffic, so port [...]

Posted by arlene

This is by no means an exhaustive list of current symmetric cryptosystems, but is rather a quick list of interesting and commercially important systems.
DES
The Data Encryption Standard (DES) is a block cipher that uses a 56-bit key to encrypt a 64-bit plaintext block into a 64-bit ciphertext block. DES is defined by Federal Information Processing [...]

Posted by arlene

When the message to be encrypted is longer than the block length of the cipher, it is necessary to execute the algorithm several times and to combine the results in some way. The method of combination is called the mode of operation.
Electronic Codebook Mode
In electronic codebook (ECB) mode the encryption algorithm is applied independently to [...]

Posted by arlene

A protocol is a series of steps taken to accomplish a task. In fact, this is also the definition of an algorithm, but we use algorithm to refer to the attainment of internal, mathematical results such as encrypting a block, and protocol to refer to the attainment of user-visible results such as secret communication and [...]

Posted by arlene

Public Key Destruction
In many cases, cryptographic keys remain valuable long after they leave service. An attacker might record all the ciphertext encrypted under a key and hold it for a long period. If the key becomes available later, all the saved ciphertext can be decrypted easily. Here are some suggestions for destroying keys when they [...]

Posted by arlene

A digital signature is an information block attached to a message that could have been created only by a particular individual. One can use public-key technology to produce such a digital signature by creating a message digest of the message and encrypting the message digest with one’s private key. Anyone can validate a signature using [...]

Posted by arlene

Public Key Generation
The main requirement for cryptographic keys is that they be chosen at random. Unfortunately, true randomness is very difficult to achieve. Because of this, many systems attempt to mix changing data from several sources, but this approach is often unsuccessful. For example, an early version of a popular secure Web browser created cryptographic [...]

Posted by arlene

Computer security is always changing. New hardware and new software arrive constantly, and the rapid evolution of Internet technologies only compounds the problem. New systems, and even changes in existing systems, require new security analyses. Beyond the technology evolution, changing business requirements demand system changes as well.
Key Security Issues
Computer security has many enemies, including complexity, [...]