A Dynamic and Efficient Crypto-Steganography System for Securing Multiple Files in Cloud

Traditional steganography is generally based on the way of hiding payloads into a cover image. In this way, the quality of the visibility is subject to the size of cover image and the payload size. Existing works provided the attempts to manage multiple payloads to multiple cover images simultaneously. However, the secure and fine-grained access control for stego images has not been addressed. In this paper, we propose a system scheme called CryptSteg to support a secure and fine-grained data hidden in the image files shared on cloud. Essentially, we integrate the ciphertext policy-attribute based encryption (CP-ABE) and the symmetric encryption to secure the payload and the secret key in the cryptographic steganography setting. In addition, we proposed an algorithm to embed the ciphertext payload into multiple cover images. For the evaluation, we conducted the experiment to demonstrate the efficiency of our proposed scheme.