Abstract: In a file sharing system, a key manager unit realizes a correspondence between the first user identifier and the first public key in response to a registration request of the first user, generates a first key material for encrypting the first file into a first encrypted file, and generates a first credential according to the first user identifier, the first file identifier, the first public key and the first key material after receiving an access-right claim request to the first file from the first user. A file storage unit stores the first encrypted file and the first credential. The first user uses the first user identifier, the first file identifier and the first private key to retrieve the first key material out of the first credential, and uses the first key material to decrypt the first encrypted file into the first file.

Abstract: An electronic apparatus with rotation function includes a loading side, a stationary portion and a rotation portion. The stationary portion is disposed at the loading side. The rotation portion is configured for connecting with a functional apparatus. The rotation portion is connected with the stationary portion in an unfixed way. The functional apparatus rotates relative to the stationary portion by the rotation portion.

Abstract: A display device including a rotatable stand and a display module provided on the rotatable stand is provided. The rotatable stand includes a base, a sleeve provided on the base, a composite washer, and a rotatable structure. One end of the sleeve is connected with the base. The composite washer has a flexible material layer and a rigid material layer. Further, the rotatable structure is disposed through the sleeve, the display module is adapted to be fixedly connected with one end of the rotatable structure, and the composite washer is disposed between the display module and the sleeve. The first rigid material layer contacts the display module, and the flexible material layer is disposed between the sleeve and the second rigid material layer.

Abstract: A display device including a rotatable stand and a display module provided on the rotatable stand is provided. The rotatable stand includes a base, a sleeve provided on the base, a composite washer, and a rotatable structure. One end of the sleeve is connected with the base. The composite washer has a flexible material layer and a rigid material layer. Further, the rotatable structure is disposed through the sleeve, the display module is adapted to be fixedly connected with one end of the rotatable structure, and the composite washer is disposed between the display module and the sleeve. The first rigid material layer contacts the display module, and the flexible material layer is disposed between the sleeve and the second rigid material layer.