Symmetric Cryptography
The algorithms are public, but a common secret information to the sender and the recipient can use them among several people. They say "symmetric" because transmitter and receiver have the same level of information.
Cryptology
Greek kryptos (hidden) and Logos (Science), "cryptography" literally means science of secret and intended to hide information of a message. Its purpose is threefold: to ensure Privacy, Guaranteeing the authenticity and preserve theintegrity information. This science, born thousands of years ago but organized by discipline in recent decades only, includes two major fields of study, cryptography and cryptanalysis.
Cryptosystem
System composed of cryptographic algorithms, all plaintexts possible, all text and figures of all keys.
CSMA / CD
Method ofMultiple Access in which each user verifies that the channel is free before starting a Issue, Then listens for the broadcast to detect a possible collision.
This method is widely used in local area networks of the type EthernetAnd radio networks in the type of Aloha.
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