image encryption based on chaos

[bunti]

can someone please explain me how the key of 128 bits is used in encryption in the following paper "A NOVEL FAST IMAGE ENCRYPTION SCHEME
BASED ON 3D CHAOTIC BAKER MAPS"...I dint get how a binary number of 24 bits is mapped to a floating point number.plzz do help me..im in urgent need of it.

 

[D.A.(Tony)Stewart]

You might also want to consider increasing the entropy of the seed number. https://goo.gl/lvvPq may help.
and consult with Mr Li. https://arxiv.org/find/nlin/1/au:+Li_S/0/1/0/all/0/1 to understand more.
Or see how using random sequences encode repetitive data to give random results.
https://arxiv.org/ps/nlin/0405038
more from Mr Li.

The process is reversible but hard to predict or de-cipher.

Unlike think of any number now use a simple algorithm that is not chaotic such as divide by 9, 3 times then decode it by multiplying x 9... 3 times.
To do this better think pseudo random noise algotithm, (Chaos) and apply to raw data. then do the reverse to extract original data.