(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.