professional smart card can be understood. To understand the internal code plus 1 card, first of all, we need
to start to understand the structure of the card from the E1 card, a plus 1 card is mainly divided into
1024 x 8 bits of EEPROM memory it is composed of 16 sectors, and each sector has 4 segments. Each
segment has 16 bytes in the erased state, and the value of the EEPROM cell is logic " 0 " and the EEPROM
is read in the write state the value of the unit is the logical " 1 ", and what is the segment?
Section 1 : the manufacturer segment is the first data segment in the first area of the memory ( segment 0 ),
which contains the data of the IC card manufacturer and the global unique ID logo. On the basis of
confidentiality and system security, this section is programmed to be write-protected after the IC card vendor is programmed.
Section 2 : the data segment is used to hold data, and the data segment can be configured by the following
access bits accessbits
Section 3 :the value segment has a fixed data format that can be used for error detection and correction and
backup management, and the value segment can only be generated at a write operation in the value segment
format : value : representation a 4-byte value with a symbol. The lowest byte of this value is
kept in the lowest address. The fetched bytes are saved in standard 2 format. In order to ensure the
correctness and confidentiality of the data, the value was saved three times, twice without anti-save, and the first time was anti-save. Adr :represents a 1-byte address that is used to save the address of
the storage section when a strong backup management is performed. The address byte is saved four times,
and the reverse is saved twice. The address remains the same when performing an increase, decrease,
recovery,and transmission operation. It can only be changed by writing commands.
Section 4 : each section of the end section has a tail section, which includes : key A and B ( optional ), and
return logic " 0 " when reading the key
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