The card serial number is not encrypted and any reader that is ISO compliant can read the card serial number. Edit 1: Mifare Card Serial Number is the unique identifier defined in ISO 14443-3A. There are 3 types of UID defined in the standard - single ( 4Byte ), Double ( 7 bytes ) and Triple ( 10 bytes ).

Each Mifare 1k has unique number (UID number). But you will find different UID number read by differen readers because the UID number of MIFARE 1K card has multiple
international standard encoding rules. Some NIC card numbers read by the card reader will be repeated, mostly because the card is not read according to the international coding
rules.

For example, the data of the 0th block of the 0th sector:

2A83155E E288040047C129D24D000607

Manchester code (hex):

HEX big endian

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1. The positive code is “2A83155E”, which is the first 4 bytes of 0 sector 0 block, a total of 8 numbers or letters.

HEX small endian

2, the inverse code is “5E15832A”, that is, the first 4 bytes of the 0 sector 0 block are reversed, a total of 8 numbers or letters.

ABA code (decimal):

1. The positive code is the decimal number converted by the Manchester code. According to the example, the result is “0713233758”, a total of 10 digits.

2. The inverse code is the decimal number converted by the Manchester code. According to the example, the result is “578468138”, a total of 10 digits.

STARNFC is a professional supplier of RFID cards and smart cards. We not only manufacturer of RFID cards but only supply the service for encoding the UID number of RFID cards.

Any questions of smart cards , contact us, our team wait for you and give you the professional answers.