LOSSLESS AND REVERSIBLE DATA HIDING IN ENCRYPTED IMAGES WITH PUBLIC KEY CRYPTOGRAPHY

Abstract

In this paper, system uses the cryptography and steganography concept, which proposes a lossless, reversible, and combined data hiding methods for images encrypted by public key cryptosystems with probabilistic and homomorphic properties. In the lossless method, pixels of encrypted images are replaced with new values to embed additional data into LSB-planes of ciphertext pixels by multiple layer wet paper coding. Thus, original data can be directly extracted from encrypted image, and the data embedding does not affect the decryption of plaintext image. In the reversible method, histogram shrink is done before image encryption, so that the modification on cipher text images for data embedding will not cause any loss in plaintext image. With the combined lossless and reversible technique, receivers extract a part of embedded data before decryption, extract another part of embedded data and recover the original plaintext image after decryption. Keywords: Lossless, reversible, encryption, data hiding, decryption Cite this Article Amrtha Anand K, Dheena Kurien . Lossless and Reversible Data Hiding in Encrypted Images with Public Key Cryptography . Current Trends in Information Technology . 2016; 6(2): 27–33p.