Steps to Disable or Enable Administrator Using Command Prompt

Command Prompt, also known as cmd.exe or just cmd (after its executable file name), is the command-line interpreter on OS/2 and eComStation, Windows CE and Windows NT operating systems. It is the counterpart of COMMAND.COM in DOS and Windows 9x systems (where it is also called "MS-DOS Prompt"), or some of the Unix shells used on Unix-like systems. (More advanced Unix shells must be compared with Windows PowerShell, another command-line interpreter of Windows.)

How make a Key Logger in C language.

Keylogger is a computer program which captures all the key strokes pressed by user in real time. It captures all the keys and write them to some file say log.txt and stores it on computer hard disk. Now sending these logs to emails or FTP address depends upon the type of keylogger that is keylogger is remote keylogger or physical keylogger. Physical keyloggers are useful when you have physical access to that system and can retrieve logs personally. While remote keyloggers can be used from anywhere in the world, the only requirement is that victim must have internet connection. Today we will be writing a C program of Physical keylogger or Keystroke logger which requires physical access of the system. We will be extending our logic in further programs to make it remote keylogger which sends logs to FTP’s and Emails directly.

Algorithm for writing a Simple Keylogger :

1. Create an Empty log file for storing keylogs.
2. Intercept keys pressed by user using GetAsyncKeyState() function.
3.  Store these intercepted values in file.
4.  Hide the Running Window Dialog to make it undetectable.
5.  Use while loop to make it running in all conditions.
6.  Add Sleep() function to reduce the CPU usage to 0%.

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CCNA tutorials Part 1
Introduction to networking devices

HUB

Hubs connect computers together in a star topology network. Due to their design, they increase the chances for collisions. Hubs operate in the physical layer  of the OSI model and have no intelligence. Hubs flood incoming packets to all ports all the time. For this reason, if a network is connected using hubs, the chances of a collision increases linearly with the number of computers (assuming equal bandwidth use). Hubs pose a security risk since all packets are flooded to all ports all the time. If a user has packet sniffing software, they can extract data from the network and potentially decode it and use it. Hubs make it easy to "spy" on users on the same LAN as you.

REPEATER

A repeater is an electronic device that receives a signal and retransmits it at a higher level and/or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances without degradation. Because repeaters work with the actual physical signal, and do not attempt to interpret the data being transmitted, they operate on the physical Layer, the first layer of the OSI model. Repeaters are majorly employed in long distance transmission to reduce the effect of attenuation. It is important to note that repeaters do not amplify the original signal but simply regenerate it.

What is WEP Wireless Encryption?

Wired Equivalent Privacy (WEP) is a security protocol for wireless networks that encrypts transmitted data . The disadvantage is that without any security, your data can be intercepted without difficulty.

However, WEP was an early attempt to secure wireless networks, and better security is now available such as DES, VPN, and WPA. 

WEP has three settings: Off (no security), 64-bit (weak security), 128-bit (a bit better security). WEP is not difficult to crack, and using it reduces performance slightly.

If you run a network with only the default security, where WEP is turned off, any of your neighbors can immediately log on to your network and use your Internet connection.

• For wireless devices to communicate, all of them must use the same WEP setting. (40-bit and 64-bit WEP encryption are the same thing — 40-bit devices can communicate with 64-bit devices.)

While there is no extra performance cost to encrypting the longer key, there is a cost to transmitting the extra data over the network. 128-bit security is not much more difficult than 64-bit to crack, so if you are concerned about performance, consider using 64-bit. If you're very concerned about security, use WPA, which replaces WEP which is almost impossible to crack. 

The WEP concept of passphrase is introduced so that you do not have to enter complicated strings for keys by hand. The passphrase you enter is converted into complicated keys. Choose passphrases with the same care you would important passwords.

• With 128-bit encryption, you need to enter a passphrase to generate each key.
• All four keys must be specified, because WEP switches between them to make your traffic more difficult to break.
• All devices within your LAN must use the same passphrases (i.e., the same keys).

WEP is not necessary if you have a gaming console such as PlayStation or Xbox, and there are no other computers on the network, and no neighbours nearby within wireless range.

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