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how implicit tagging reduces overhead of number of bytes transferred in ASN.1 ?
When using BER (BASIC ENCODING RULES) or DER (DISTINGUISHED ENCODING RULES), data for types are encoding using a Type-Length-Value format. Each primitive ASN.1 Type such as INTEGER has a UNIVERSAL TAG assigned by the ASN.1 standard. If you have just
A ::= INTEGER
This has a tag of UNIVERSAL2, so an encoding of the interger value5 in BER would be in hex020105.
B ::= [2] IMPLICIT INTEGER
For B, with an implicit tag, this says to replace the existing tag on INTEGER with [2], so the encoding in BER of the value5 would be in hex820105.
C ::= [2] EXPLICIT INTEGER
For C, with an explicit tag, this says to add [2] in front of the existing tag, so the encoding in BER of the value5 would be in hex A.
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