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Asia Pacific

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Submitted By sakshi25
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In computer science, Secure Transmission refers to the transfer of data such as confidential or proprietary information over a secure channel. Many secure transmission methods require a type of encryption. The most common email encryption is called PKI. In order to open the encrypted file an exchange of keys is done.
Many infrastructures such as banks rely on secure transmission protocols to prevent a catastrophic breach of security. Secure transmissions are put in place to prevent attacks such as ARP spoofing and general data loss. Software and hardware implementations which attempt to detect and prevent the unauthorized transmission of information from the computer systems to an organization on the outside may be referred to as Information Leak Detection and Prevention (ILDP), Information Leak Prevention (ILP), Content Monitoring and Filtering (CMF) or Extrusion Prevention systems and are used in connection with other methods to ensure secure transmission of data.
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[edit]Secure transmission over wireless infrastructure
Main article: Wired Equivalent Privacy
WEP is a deprecated algorithm to secure IEEE 802.11 wireless networks. Wireless networks broadcast messages using radio, so are more susceptible to eavesdropping than wired networks. When introduced in 1999, WEP was intended to provide confidentiality comparable to that of a traditional wired network. A later system, called Wi-Fi Protected Access (WPA) has since been developed to provide stronger security.
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[edit]Web-based secure transmission
Main article: secure socket layer
Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide secure communications on the Internet for such things as web browsing, e-mail, Internet faxing, instant messaging and other data transfers. There are slight differences between SSL and TLS, but they are substantially the same.
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Data representation
The purpose of a network is to transmit information from one computer to another. To do this, you first have to decide how to encode the data to be sent, in other words its computer representation. This will differ according to the type of data, which could be: * Audio data * Text data * Graphical data * Video data * ...
Data representation can be divided into two categories: * Digital representation: which means that the information is encoded as a set of binary values, in other words a sequence of 0s and 1s * Analogue representation: which means that the data will be represented by the variation in a continuous physical quantity
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Data transmission medium
In order for data transmission to occur, there must be a transmission line, also called transmission channel or channel, between the two machines.
These transmission channels are made up of several segments that allow the data to circulate in the form of electromagnetic, electrical, light or even acoustic waves. So, in fact, it is a vibratory phenomenon that is propagated over the physical medium.
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Encoding of transmission signals
In order for data to be exchanged, an encoding must be chosen for the transmission signals. This depends basically on the physical medium used to transfer the data, the guaranteed data integrity and transmission speed.
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Simultaneous data transmission
Data transmission is called "simple" if there are only two machines communicating, or if only a single piece of data is sent. Otherwise, it is necessary to install several transmission lines or to share the line among several different communication actors. This sharing is called multiplexing.
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Communication protocols
A protocol is a common language used by all actors in the communication to exchange data. However, its role does not stop there. A protocol also allows: * Initiation of communications * Data exchange * Error detection * A "courteous" end of communications

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