Electronic certificate

The utility model relates to an electronic certificate which is composed of a Blue tooth integrated circuit I, a program storage cell II, a data storage unit III and a control unit IV, wherein the Blue tooth integrated circuit comprises a frequency spread communication apparatus, a base band processor, software stack and a microcontroller for software which is relevant to the electronic certificate; the frequency spread communication apparatus can realize full duplex or half duplex and works at the frequency of 2.4GH, the base band processor confirms to Blue tooth protocol and has the capability of communication channel coding edit and encryption decoding, and the software stack operates the Blue tooth. The data storage unit stores pertinent data which represent the content of the electronic certificate, I is connected with IV through a PIO interface, I is also connected with III through the PIO interface, and what transferred among unites are digital signals; instruction received from an aerial of I unite is orderly demodulated, decrypted and decoded, and then, are processed by instruction coding. According to content of the instruction, data is taken out from corresponding regions in unit III to the I; after processed by coding encryption, the data is modulated to send out. The utility model has the advantages of far communication distance, autonomous communication, high intelligencization, complete digitalization, small volume, low cost, good confidentiality, etc.