Survey on Reversible Data Hiding in Encrypted Images by Reversible Image Transformation (RIT)
Silpa Rajan1, Minu Lalitha Madhavu2
1Silpa Rajan, M. Tech. Scholar, Department of Computer Science and Engineering, Kerala University, (Kerala) India.
2Minu Lalitha Madhavu, Assistant Professor, Sree Buddha College of Engineering, Kerala University, (Kerala) India.
Manuscript received on February 20, 2017. | Revised Manuscript received on February 27, 2017. | Manuscript published on March 05, 2017. | PP: 26-29 | Volume-7 Issue-1, March 2017. | Retrieval Number: A2959037117/2017©BEIESP
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Abstract: To increase the security of the data, an image is in taken in an encrypted format. This process is followed in earlier techniques like RRBE, VRAE etc. In RIT, instead of converting it into an encrypted format, it is converted into another image. Hence this image appears simply an anotherimage which is difficult for other users to decrypt. Using contrast – enhancement RDH method, data is then hidden in to the image. The advantage of using RDH is that there occurs no loss of data and contrast of the image is highly enhanced. Hence visual quality of the image is increased. The embedded data is extracted after which it is decrypted to recover the original data.
Keywords: Prediction error expansion, reversible data hiding, RRBE (reserving room before encryption), RIT ( reversible image transformation), VRAE (vacating room after encryption).