Canonical Encoding Rules
<protocol, standard> (CER) A restricted variant of BER for producing
unequivocal transfer syntax for data structures described by ASN.1.
Whereas BER gives choices as to how data values may be encoded, CER and DER
select just one encoding from those allowed by the basic encoding rules,
eliminating all of the options. They are useful when the encodings must be
preserved, e.g. in security exchanges.
CER and DER differ in the set of restrictions that they place on the encoder.
The basic difference between CER and DER is that DER uses definitive length form
and CER uses indefinite length form.
Documents: ITU-T X.690, ISO 8825-1.
See also PER.
(1998-05-19)
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