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Therefore the first record (record number one, #1) is the first created record. Within each EF of linear structure, the record numbers shall be sequentially assigned when writing or appending, i.e.Referencing by record number – Within each EF of record structure, the record numbers are unique and sequential : The value ’00’ shall refer to the first, last, next and previous record in the numbering sequence, independently from the record identifier.The previous occurrence shall be the closest record with the specified identifier but in a smaller logical position than the current record. When there is a current record, the next occurrence shall be the closest record with the specified identifier but in a greater logical position than the current record.The previous occurrence shall be equvalent to the last occurrence. When there is no current record, the next occurrence shall be equivalent to the first occurrence.The first occurrence shall be the record with the specified identifier and in the first logical position the last occurrence shall be the record with the specified identifier and in the last logical position.The following additional rules are defined for linear structures and for cyclic structures : the most recently created record is in the first logical position. Within each EF of cyclic structure, the logical positions shall be sequentially assigned in the opposite order, i.e.Therefore the first created record is in the first logical position. Within each EF of linear structure, the logical positions shall be sequentially assigned when writing or appending i.e.Within an EF of record structure, records may have the same record identifier, in which case data contained in the records may be used for discriminating between them.Įach time a reference is made with a record identifier, an indication shall specify the logical position of the target record the first or last occurrence, the next or previous occurrence relative to the record pointer : If a record is a SIMPLE-TLV data object in the data field for a message (see 1.4.4), then the record identifier is the first byte of the data object.
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Referencing by record identifier – Each record identifier is provided by an application. Referencing by record number shall not affect the record pointer. A reset of the card, a SELECT FILE and any command carrying a valid short EF identifier can affect the record pointer. Referencing by record identifier shall induce the management of a record pointer. The value ’00’ is reserved for special purposes. Record identifiers and record numbers are unsigned 8-bit integers with values in the range from ’01’ to ‘FE’. Within each EF of record structure, each record can be referenced by a record identifier and/or by a record number. when selecting by means of application identifiers as define in part 5 of ISO/IES 7816), each DF name shall be unique within a given card. In order to select unambiguously by DF name (e.g. Referencing by DF name – Any DF may be referenced by a DF name coded on 1 to 16 bytes.Short EF identifiers connot be used in a path or as a file identifier (e.g. The value ‘0’ used as a short EF identifier references the currently selected EF. Referencing by short EF identifier – Any EF may be referenced by a short EF identifier coded on 5 bits valued in the range from 1 to 30.The path allows an unambiguous selection af any file from the MF or from the current DF. If the identifier of the current DF is not known, the value ‘3FFF’ (reserved value) can be used at the beginning of the path. The order of the file identifiers is always in the direction parent to child. Between those two identifiers, the path consists of the identifiers of the successive parent DFs if any. The path begins with the identifier of the MF or of the current DF and ends with the identifier of the file itself. Referencing by path – Any file may be referenced by a path (concatentation of file identifiers).
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In order to select unambiguously any file by its identifier, all EFs and DFs immediately under a given DF shall have different file identifiers. The value ‘3FFF’ is reserved (see referencing by path). The value ‘FFFF’ is reserved for future use. If the MF referenced by a file identifier, ‘3F00’ shall be used (reserved value). Referencing by file identifier – Any file may be referenced by a file identifier coded on 2 bytes.When a file cannot be implicitly selected, it shall be possible to select it by at least one of the following methods :