  This paper proposes an idea of data computing in the covert domain (DCCD). We
show that with information hiding some data computing tasks can be executed
beneath the covers like images, audios, random data, etc. In the proposed
framework, a sender hides his source data into two covers and uploads them onto
a server. The server executes computation within the stego and returns the
covert computing result to a receiver. With the covert result, the receiver can
extract the computing result of the source data. During the process, it is
imperceptible for the server and the adversaries to obtain the source data as
they are hidden in the cover. The transmission can be done over public
channels. Meanwhile, since the computation is realized in the covert domain,
the cloud cannot obtain the knowledge of the computing result. Therefore, the
proposed idea is useful for cloud computing.
