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canonical encoding rules

canonical encoding rules in Technology

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.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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