Abstract:
Nowadays, image information is routinely
used in many applications. This paper presents
comparative study for image encryption based
on Chaotic Logistic Map with external secret key
of both 80 bit and 256 bit with different logistic
maps. Security is critical issue when images are
sent from journalist to editor via communication
channel. To apply image security on this media
system, journalist encrypts and sends cipher
image to editor and only authorized editor can
decrypt cipher image. Chaotic Logistic Map with
80 bit is implemented in web based system
because of its randomness, less correlation and
unpredictable behavior in long term that are
secure and safe. Chaotic Logistic encryption
scheme provides good combination of highly
secured, fast processing, efficient and secure way
for image encryption. Correlation coefficient,
NPCR (change rate of the number of pixels of
ciphered image) and histogram are analyzed to
prove security of algorithm used in this system.
