| 摘要 |
The present invention relates to IT technical field, and especially relates to a method, device and system for protecting data security in the cloud. The method, provided by the present invention, for protecting data security in the cloud comprises: a key management center encrypts initial data M transmitted by a first terminal, uploads the encrypted data C1 by encrypted to a cloud server, obtains encrypted data C2 when receiving a request, transmitted by a second terminal, for decrypting data or downloading data, and transmits the encrypted data C2 to the second terminal so that the second terminal decrypts the encrypted data C2 to obtain the initial data M according to the key handed in itself. By the method provided by the embodiment, it make sure that the second terminal can decrypt the encrypted data C2 to obtain the initial data M according to the key handing itself,and also that the key of the encrypted data C1 saved in the cloud server cannot be disclosed to reduce the risk of the key disclosure and enhance the security of the data sharing. |
