1. Look at the security bar code on transparent paper. The first five digits in the first line are the logistics code and delivery time, the first digit represents the year, and the last four digits represent the month and date.

2, 6- 12 is the serial number of the production code.

3. The bits 13- 14 indicate the cigarette packaging code.

4. 15- 16 bits represent the sequence code, with a maximum of 50 bits.