matlab code for chaotic image encryption
#1

hi am hayder i would like to get details on matlab code for chaotic image encryption ..My friend Justin said matlab code for chaotic image encryption will be available here and now i am living at baghdad and i last studied in the college mustinsiriah and now i need help on , the code of program used to implement 4d chaotic system to encrypt the color image .
thank you
marun_11981[at]yahoo.com
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#2

In recent years, the chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. In this communication, we propose a new approach for image encryption based on chaotic logistic maps in order to meet the requirements of the secure image transfer. In the proposed image encryption scheme, an external secret key of 80-bit and two chaotic logistic maps are employed. The initial conditions for the both logistic maps are derived using the external secret key by providing different weightage to all its bits. Further, in the proposed encryption process, eight different types of operations are used to encrypt the pixels of an image and which one of them will be used for a particular pixel is decided by the outcome of the logistic map. To make the cipher more robust against any attack, the secret key is modified after encrypting each block of sixteen pixels of the image. The results of several experimental, statistical analysis and key sensitivity tests show that the proposed image encryption scheme provides an efficient and secure way for real-time image encryption and transmission.

The paper proposes a new image encryption scheme based on chaotic encryption. It provides a fast
encryption algorithm based on coupled chaotic map. The image is encrypted using a pseudorandom key
stream generator. The image is partially encrypted by selecting most important components of image. To
obtain most important components of an image, discrete wavelet transform is applied.
Chaos theory has been established since 1970s. The distinct properties of chaos, such as
ergodicity, quasi-randomness, sensitivity dependence on initial conditions and system parameters,
have granted chaotic dynamics as a promising alternative for the conventional cryptographic
algorithms.
A new way of image encryption scheme has been proposed which utilizes a chaos-based
cryptographic scheme using the logistic map. A combined image compression and encryption
scheme is proposed. The model is achieved by using discrete wavelet transform and RLE for
compression. Chaos based system is used for encryption. This algorithm encrypts image pixel by
pixel taking consideration the values of previously encrypted pixels. This system is robust against
cryptanalytic attacks. Also a simple implementation of image encryption achieves high
encryption rate on general purpose computer. In mobile bandwidth constraints and power saving
are needed for which the proposed algorithm is suitable.
The image is encrypted pixel by pixel using logistic maps. The advantage of logistic map is that it
has a very complex dynamics. Use of two logistic map increases the complexity of algorithm.
Only the first few coefficients are encrypted since energy is concentrated in these values. This
will save the execution time. The algorithm uses a coupled logistic map. It has a pseudorandom
key stream generator that generates a binary stream which used in chaotic encryption. The first
logistic map whose initial parameters are taken from the KEY generated during user
authentication process provides the initial parameters for second logistic map.
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