Abstract: A method comprises obtaining scan information by scanning a quick response QR code in a quick response key QRkey card, wherein the QR code includes a website link and a public key; opening a network platform page corresponding to the website link in the QR code; and obtaining a private key matching with the public key in the QR code and sending the private key to a user corresponding to the QRkey card, so that the user corresponding to the QRkey card can encrypt preset information by using the public key and decrypt the encrypted information by using the private key. A device comprises a first acquisition module, an open module and a second acquisition module. In the present invention a public key and a private key can be obtained by scanning a QR code in a QRkey card, thus a simple and convenient method for obtaining a key is provided.

Abstract: A method comprises obtaining scan information by scanning a quick response QR code in a quick response key QRkey card, wherein the QR code includes a website link and a public key; opening a network platform page corresponding to the website link in the QR code; and obtaining a private key matching with the public key in the QR code and sending the private key to a user corresponding to the QRkey card, so that the user corresponding to the QRkey card can encrypt preset information by using the public key and decrypt the encrypted information by using the private key. A device comprises a first acquisition module, an open module and a second acquisition module. In the present invention a public key and a private key can be obtained by scanning a QR code in a QRkey card, thus a simple and convenient method for obtaining a key is provided.

Abstract: A method for the protection of an application comprises: receiving a command for locking the specified application; extracting user's biometric information; using the user's biometric information to lock the specified application. Furthermore, an apparatus for the protection of an application comprises: a receiving module, a extraction module and a locking module. In the invention, the user's biometric information is obtained and used to lock the specified application, so that the specified application can be locked and the user can use other applications conveniently; furthermore, the protection of the specified application is also improved.

Abstract: A method comprises steps of: acquiring a function operation instruction input by a user; and scanning a fingerprint of the user and performing identity authentication on the user according to the fingerprint, if an operation corresponding to the function operation instruction is authentication; storing data information into a preset storage space, if an operation corresponding to the function operation instruction is data information storage; charging a preset device, if an operation corresponding to the function operation instruction is charging. The multifunctional MCU comprises an acquisition module, an authentication module, a storing module and a charging module.