!!! Overview
[{$pagename}] ([CER]) is a restricted variant of [Basic Encoding Rules] for producing unequivocal transfer syntax for data structures described by [ASN.1]. 

Whereas BER gives choices as to how data values may be encoded, [{$pagename}] (together with DER) selects just one [encoding] from those allowed by the [Basic Encoding Rules], eliminating rest of the options. [{$pagename}] is useful when the [encodings] must be preserved, e.g. in security exchanges.[1]

[{$pagename}] was designed for use with messages so huge that it is easiest to start [encoding] them before their entire value is fully available. 

[{$pagename}] is rarely used, as the industry has locked onto [Distinguished Encoding Rules] as the preferred means of encoding values for use in secure exchanges.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]

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* [#1] - [http://en.wikipedia.org/wiki/Canonical_Encoding_Rules#CER_encoding] Retrived 2012-12-28