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This paper proposes a data hiding scheme for high quality stego-images in the encrypted images based on a homomorphic encryption algorithm and matrix embedding method. To achieve the message embedding in the encryption domain, we first present an image encryption algorithm satisfying additive homomorphism based on the stream cipher. Then, we offer a matrix embedding method using Golay code, which has good embedding efficiency. In the proposed scheme, we pre-code the least significant bit (LSB) vectors of the cover image into the codewords before image encryption, so that we can implement the matrix embedding in the encrypted image. The experimental results show that the proposed scheme has excellent security performance. We can get a high quality stego-image after the image decryption and recover the cover image into a fidelity image while providing considerable payload. INDEX TERMS Fidelity preserved, homomorphism, matrix embedding, Golay code, data hiding, encrypted image.

Wireless ad hoc networks , especially in the hostile environment, are vulnerable to traffic analysis which allows the adversary to trace the routing messages and the sensitive data packets. Anonymity mechanism in ad hoc networks is critical securing measure used to mitigate these problems. In this paper, we propose a novel secure anonymous routing scheme for clustered wireless ad hoc networks. In our proposed scheme, we use the bloom filter to establish secure anonymous routing in trust and clustered wireless ad hoc networks. It provides not only the basic sender and receiver anonymity, but also the link anonymity and the identity anonymity to the forwarders en route.

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