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- Narendra K. Pareek, Vinod Patidar, Krishan K. Sud
- Image Vision Comput.
- 2006

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… (More)

Recently, Pareek et al. [Phys. Lett. A 309 (2003) 75] have developed a symmetric key block cipher algorithm using a one-dimensional chaotic map. In this paper, we propose a symmetric key block cipher algorithm in which multiple one-dimensional chaotic maps are used instead of a one-dimensional chaotic map. However, we also use an external secret key of… (More)

- Vinod Patidar, Krishan K. Sud, Narendra K. Pareek
- Informatica
- 2009

During last one and half decade an interesting relationship between chaos and cryptography has been developed, according to which many properties of chaotic systems such as: ergodicity, sensitivity to initial conditions/system parameters, mixing property, deterministic dynamics and structural complexity can be considered analogous to the confusion,… (More)

- Narendra K. Pareek, Vinod Patidar, Krishan K. Sud
- I. J. Network Security
- 2010

Chaotic systems have many interesting features such as sensitivity on initial condition and system parameter, er-godicity and mixing properties. In this paper, we exploit these interesting properties of chaotic systems to design a random bit generator, called CCCBG, in which two chaotic systems are cross-coupled with each other. To evaluate the randomness… (More)

- Narendra K. Pareek, Vinod Patidar, Krishan K. Sud
- Digital Signal Processing
- 2013

- Vinod Patidar, K. K. Sud
- 2009

During last one and half decade an interesting relationship between chaos and cryptography has been developed, according to which many properties of chaotic systems such as: ergodicity, sensitivity to initial conditions/system parameters, mixing property, deterministic dynamics and structural complexity can be considered analogous to the confusion,… (More)

- Vinod Patidar, G. Purohit, K.K. Sud, N.K. Pareek
- 2010 International Workshop on Chaos-Fractal…
- 2010

A novel permutation-substitution scheme, which is based on chaotic standard map, for the image encryption is proposed. It is loss-less symmetric block cipher and specifically designed for the colour images. The initial condition & system parameter of the chaotic standard map, number of iterations and number of rounds constitute the secret key of the… (More)

In this paper, a new image encryption scheme for colour BMP images using a secret key of 120-bits is proposed. Initially, image is divided into blocks subsequently into color components. Each color component is modified by performing bitwise operation which depends on secret key used in algorithm as well as a few most significant bits of its previous and… (More)

- Narendra K Pareek, Vinod Patidar, Krishan K Sud, Vigyan Bhawan
- 2011

In this paper, a new image encryption scheme using a secret key of 128-bit size is proposed. In the algorithm, image is partitioned into several key based dynamic blocks and further, each block passes through the eight rounds of diffusion as well as substitution process. In diffusion process, sequences of block pixels are rearranged within the block by a… (More)

- Rohit A Joshi, Sumit S G. P. Bhole, +13 authors Nejib Smaoui
- 2011

This paper proposes an improved image encryption scheme over existing scheme. The distinct feature of improved encryption scheme is that it encrypts the image using chaotic maps only without further confusing this encrypted image as illustrated in existing scheme. Further, the advantages over existing scheme are 1) the proposed algorithm is completely… (More)