Abstract Syntax Notation One (ASN.1) is a language that defines the way data is sent across dissimilar communication systems.

ASN.1 ensures that the data received is the same as the data transmitted by providing a common syntax for specifying Application layer (program-to-program communications) protocols.

ASN.1 is an ISO /ITU standard based on the OSI model. It was first defined in 1984 as part of CCITT X.409; revised in 1995; then became its own standard, X.208, in 1998.

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