A method of storing a data object received from a network is described. An encrypted data object encrypted with a first encryption key is received. It is determined whether the encrypted data object is to be stored in an encrypted file system that requires encryption of a data object with a second encryption key. The first encryption key is encrypted with a third encryption key when it is determined the encrypted data object is to be stored in the encrypted file system. The first encryption key is attached to the encrypted data object. The data object encrypted by the first encryption key is stored in the encrypted file system.