Digital
Describes a representation of information by a finite number of discrete values.
It says, for opposition to Analog, Representation of data or physical quantities using characters - numbers generally - and also systems, devices or processes using this method of discrete representation.
Advances in information technology and communication are based largely on a fundamental technological innovation: the scanning. In conventional systems - so-called analog - Signals (radio, television, etc..) Are conveyed in the form of continuous electric waves. With digitization, the signals are encoded as sequences of numbers, themselves often represented in binary system by groups of 0 and 1. The signal then consists of a discontinuous set of numbers: it became a file type computer.
English: digital, numerical, numeric.
ISDN
Name Brand Network Digital Integrated Services (ISDN) Of France Telecom.
Scanning
Conversion of a signal Analog a signal Digital. The scan consists of two parallel activities: theSampling and quantification. The sampling is to take periodic samples of a signal Analog. Quantification is to assign a numerical value to each sample.
Oakeley
Sharing session keys Oakley provides an exchange of session key Diffie Hellman Hybrid intended to be used in an ISA / KMP. Oakley brings important property of Perfect Forward Secrecy = perfect forward secrecy.
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