Background: Recent advances in medical associated technologies have drastically increased
the amount of electronic medical records collected, stored and transferred through the
network. Considering the significance and level of sensitivity of the collected medical data, the
security of the transmitted data has become a very vital and challenging task for researchers. The
protection of these medical images with embedded data is usually guaranteed using encryption or
data hiding techniques. Conventional techniques that employ encryption or data hiding are often
insecure and also time-consuming during transmission through the network.
Materials and Methods: A method combining encryption and data hiding together can result in
compression of data that reduces the transmission time and increases the security level. Reversible
data hiding in images can reestablish the cover image after extracting the hidden embedded data
exclusive of alterations. Here a new reversible crypto-watermarking system is proposed using
cryptographic algorithms that encrypts and hides an Electronic Patient Record (EPR) into an image
corresponding to that patient using Rhombus Prediction Scheme. It embeds a big amount of
encrypted data into an image with hardly noticeable modification using spatial pixel manipulations
based on prediction errors. The marked image is hashed using SHA-256 algorithm.
Results and Conclusion: Hashing and cryptography increases the robustness and guarantees authenticity
with integrity. The proposed method results in improved safety with a lower transmission
time than the existing methods.
Keywords: Crypto-watermarking, Diffie-Hellman, image security, medical images, RC4 encryption, rhombus prediction
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