Generic String Encoding Rules
Encyclopedia
Generic String Encoding Rules (GSER) are a set of ASN.1
Abstract Syntax Notation One
Data generated at various sources of observation need to be transmitted to one or more locations that process it to generate useful results. For example, voluminous signal data collected by a radio telescope from outer space. The system recording the data and the system processing it later may be...

 encoding rules for producing a verbose, human-readable textual transfer syntax for data structures described in ASN.1.

The purpose of GSER is to represent encoded data to the user or input data from the user, in a very straightforward format. GSER was originally designed for the Lightweight Directory Access Protocol
Lightweight Directory Access Protocol
The Lightweight Directory Access Protocol is an application protocol for accessing and maintaining distributed directory information services over an Internet Protocol network...

 (LDAP) and is rarely used outside of it. The use of GSER in actual protocols is discouraged since not all character string encodings supported by ASN.1 can be reproduced in it.

The GSER encoding rules are specified in RFC 3641 and unlike other common types of encoding rules, are not standardised by ITU-T
ITU-T
The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....

.
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