Electric table security and privacy protection is the key to the safe operation of RFID system, and the invention aims at the key problem. It uses UID authentication code that is only for electric table to encrypt and reduce the digit, to get a constant for the condition of UID code, and makes encryption algorithm on the user information according to this constant, to get a group of electronic coding hidden information that has been encrypted and hidden the user information, and input into the electric table EEPROM. When reading the table, the general reader reads out a group of information with the distorted meaning. Only through the reader with RIFD system certificated decompilation procedure or the general reader which needs system decompilation, the user information can be restored for data processing. |