Canonical Encoding Rules
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<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.
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