Abstract :
In this paper, we propose a data security
protection mechanism with revocability for cloud storage
system. An encrypted message is send from the sender to
receiver through a cloud storage server. The sender only
knows the identity of the receiver. The receiver’s certificate
or its public key is not known to the sender and also the
receiver has two things in order to decrypt the ciphertext.
The secret key is stored in the computer and the unique
personal security device which connects to the computer. It
is impossible to decrypt the cipher text without both the
key. Once the Security device is lost, the device is revoked.
Since revoking has been done the ciphertext cannot be
decrypted. This can be achieved by some algorithms to
change the existing ciphertext to be un-decrypt able by this
device.
Keyword :
Multilevel, Security, Recoverability, Cloud Storage