4428PVC card introduction

Contact PVC card-4428 PVC card introduction and technical information

Contact PVC 4428PVC card is contact PVC a widely used chip, belonging to the logic encryption card, the appearance of 4428PVC card than the 4442PVC card chip is larger. Very common in the market.

4428 contact PVC card 4428 contact PVC card

I. Basic parameters of the 4428 PVC card.

● 1024 bytes of EEPROM

● 1024-byte write protection area (solidified data)

● 2-byte password, error count 8 times

● Temperature range from 35 ℃ to 80 ℃

● At least 100,000 erase cycles

● At least 10 years data retention period

II. 4428 PVC card storage area distribution.

1.4428PVC card capacity is 1Kbytes, address space from 0~1023.

2. All data can be read in any case except the password, which can be read after checking the correct one.

After checking the correct password, all data including the password itself.

4. All data can be write-protected by byte, and the data is solidified after protection and cannot be changed in any way.

5. There is a password error counter. 1021 . The initial value is 8, the password is checked once for errors and then reduced by 1. If the counter value is 0, the data of the whole card is locked and can only be read out, the password cannot be written or changed, and the check cannot be continued; if it is not 0, the correct check is only needed once, and the counter will return to the initial value.

6. The password length is 2bytes, and the address is 1022, 1023. There are 216 combinations, before the password is checked correctly, the result of reading these two addresses is "00", and cannot be written or changed; after the password is checked correctly, the password can be read, and the password can be changed, and the password will be valid until power off.

7. The unique code 21~26 is the user code of the card , the code is the only user code in the world , the maximum protection of the user , the code can not be changed after curing.

8, address 0 ~ 7, 21 ~ 26 factory before the factory has been cured before the industry, can not be changed.

Three, 4428 PVC card use precautions.

1, 4428PVC card has three security mechanisms: user password, unique code, curing write. Password is not correctly checked, can not write data, written data once written to protect (cured) can not be changed. The system uses a unique code PVC card identification, can be type of counterfeit cards can avoid breaking into the system.

2, 4428PVC whole card data can be read without a password , therefore, in the design should pay attention to the content encryption , to prevent vandals from identifying the data format .

3. The whole card is not partitioned , once the password is checked correctly , the data can be written or modified to any address , therefore, in the design should pay attention to the appropriate curing and encryption of data , to prevent unintentional destruction or illegal change of data .

4. After the password is checked correctly , it can be read. Therefore, the design procedure can prevent a saboteur from stealing the password by using an illegal interrupter to read it directly.