Technology has improved significantly, and
usage of smart systems has increased the risk to secure
data and privacy. Since most operating systems come
with built-in apps that aren't secure, there is rapid
increase in risk of information or data cloning, forgery,
tampering, counterfeiting, etc. End users will suffer an
unrecoverable loss as a result, particularly with regard to
social media personal data and banking applications. An
efficient and robust technique which has Hill cipher
combination with elliptic curve cryptography is proposed
to deal with major threats and improve data security.
This technique uses LSB (Least Significant Bit)
watermarking to embed DCT coefficients of an image and
ciphertext of message into base image. Using Hill Cipher
algorithm, the ciphertext is produced. Elliptic Curve
cryptography (ECC) and combination with Hill cipher to
increase complexity, considering the fact that it has poor
data security and is readily cracked. The key is generated
by using ECC algorithm, and this key is used with the
Hill cipher technique to produce ciphertext.
Cryptography and Steganography both combined
provide the data with greater legitimacy and ownership
for media applications. Without a proper key, it proves
difficult to get the hidden message and the image. For
multimedia applications, the performance of hiding data
and image in image data has been analyzed.
Keywords : Steganography, Cryptography, Elliptic Curve Cryptography, Hill Cipher, Self-Invertible Matrix, Discrete Cosine Transform, Least Significant Bit.