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With the popularization and application of privacy protection technologies incloud service and social network, ciphertext has been gradually becoming acommon platform for public to exchange data. Under the cover of such aplat-form, we propose steganography in encrypted domain (SIED) in this paper tore-alize a novel method to realize secret communication Based on Simmons' modelof prisoners' problems, we discuss the application scenarios of SIED. Accordingto the different accesses to the encryption key and decryption key for secretmes-sage sender or receiver, the application modes of SIED are classified intofour modes. To analyze the security requirments of SIED, four levels ofsteganalysis attacks are introduced based on the prior knowledge about thesteganography system that the attacker is assumed to obtain in advance. Fourlevels of security standards of SIED are defined correspondingly. Based on theexisting reversible data hiding techniques, we give four schemes of SIED aspractical instances with different security levels. By analyzing the embeddingand extraction characteris-tics of each instance, their SIED modes, applicationframeworks and security lev-els are discussed in detail.

The Realizations of Steganography in Encrypted Domain