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Is the der encoding the same as the ber encoding?


Asked by Rosemary Richard on Dec 03, 2021 FAQ



Like CER, DER encodings are valid BER encodings. DER is the same thing as BER with all but one sender's options removed. DER is a subset of BER providing for exactly one way to encode an ASN.1 value.
One may also ask,
The encoding rules are the same as BER, except that only definite form lengths are used, and bitstrings and OctetStrings are always encoded in primitive form. [#2] - ber_peek_tag function (winber.h) - based on information obtained 2020-10-18
In respect to this, Two related encoding rules, the Distinguished Encoding Rules (DER) and the Canonical Encoding Rules (CER) are subsets of BER which eliminate some of the extra flexibility provided by BER. Note that DER is commonly used in security-related applications such as X.509 digital certificates.
And,
The oldest encoding rules, the Basic Encoding Rules (BER), use a Tag-Length-Value (TLV) format for encoding all information. BER always sends a tag to indicate what kind of data follows, then a length indicating the length of the data that follows, then the value which is the actual data.
Indeed,
We give the structure of BER and examples, enough to acquire a flavor of the encoding/decoding rules that are used to transmit ASN.1 defined data types and values. ISO 8825 (or ISO 8825-Part 1: Basic Encoding Rules) and CCITT's X.209 contain a detailed specification of BER.