The embodiment of the invention discloses a method and a device for improving the security of a data card, which relate to the field of
information security and are invented for improving the security of information in the data card. The method includes: binding the data card inserted into the first terminal with the first terminal; generating a decryption
password; when the data card needs to be read and written, determining that the data card needs to be read and written Whether the second terminal is the first terminal, and if so, use the decryption
password to decrypt the data card. The embodiments of the present invention are mainly used in various data cards.