Narayan Pisharoty

ANU: an ultra lightweight cipher design for security in IoT

This paper proposes an ultra lightweight cipher ANU. ANU is a balanced Feistel-based network. ANU supports 64 bit plaintext and 128/80 bit key length, and it has total 25 rounds. It needs only 1015 gate equivalents for 128 bit key length that is less as compared with all existing lightweight ciphers. Its memory size is minimal, and power consumption is very less. It needs only 22 mW of dynamic power, while PRESENT cipher consumes 39 mW of power. This paper furnishes the complete security analysis of the ANU cipher design. Our security analysis shows that ANU can attain ample security level against linear and differential cryptanalysis, biclique attack, zero-correlation attack, and algebraic attack. Biclique cryptanalysis provides maximal data complexity of 264. ANU cipher not only needs less gate equivalents but also it consumes very less power and has less memory requirement. ANU cipher is best suited for applications like Internet of Things. The design of ANU cipher will have a positive impact in the field of lightweight cryptography. Copyright

Edge-based singular value decomposition for full reference colour image quality assessment

Due to intense use of digital visual aids, image quality plays a crucial role in todays life. Images are subjected to degradations during image acquisition and image processing. This affects their naturalness and usefulness in different applications. Literature shows efforts are made to develop an HVS consistent image quality metric since last few decades. New image quality metrics, extension of existing image quality algorithms and their applications are being developed by researchers community. Singular value decomposition is one of the measures which are used to quantify the amount of distortion at different distortion levels. Based on the hypothesis that the human eye is adapted to extract edge information from any natural scene, this paper presents a novel approach of introducing edge information in SVD-based image quality metric. The results are compared with SVD-based metric available in related work in literature. Proposed metric outperforms the existing metric. Also, it is extended for evaluation of colour images.

MANTRA: an ultra lightweight cipher design for ubiquitous computing

In this paper, we are proposing an ultra lightweight cipher MANTRA. MANTRA is a Feistel-based network which operates on 64-bit plain text and supports 128/80-bit key length. It needs very less footprint area and consumes only 1662 gate equivalents for the 128-bit key length and 1374 for 80-bit key length. The novel design of MANTRA uses a Feistel within a Feistel structure. Its memory size is less as compared to existing lightweight ciphers. In this paper, we have presented the security analysis of MANTRA and its performance as an ultra lightweight cipher. A strong permutation layer in MANTRA prevents clustering of linear and differential trails when the cipher is attacked. MANTRA shows good resistance against Biclique and zero correlation attacks. MANTRA is a cipher design well suited for the applications where small footprint area and low power dissipation play crucial role.

Planar Monopole UWB Antenna for USB Dongle Application

In this communication, a systematic approach for design of planar monopole ultra-wideband (UWB; 3.1 ∼ 10.6 GHz) antenna for wireless USB dongle has been proposed. The simple planar monopole antenna consists of a rectangular metallic radiating patch whose modal analysis is carried out first by means of the Theory of Characteristic Modes (TCM), in order to identify the different radiating modes and get the physical insights of these radiating modes of the antenna. Further, based on the physical evidences obtained from the radiating modes of the similar planar monopole antenna, a bevel transition feed with rectangular slot has been used to enhance the bandwidth and obtain the desired radiation characteristics of the proposed antenna. The modal analysis is carried out using characteristic modes (CM) analysis tool in CADFEKO 7.0 simulation software. The proposed antenna exhibits a very compact dimensions of 12 mm × 16 mm × 5 mm and yields a good insights in simulated and measured impedance bandwidth of 3.1 ∼ 12 GHz with VSWR < 2. Furthermore, the proposed antenna exhibits symmetrical radiation patterns, stable-high gain and efficiency and ultra-wide bandwidth making it suitable candidate for practical UWB-USB applications.

Colour image quality assessment using Laplacian pyramid decomposition

Todays world has witnessed tremendous increase in use of multimedia and internet. This demands an image quality metric capable of evaluating image quality, accurately and automatically. Natural scenes are of excellent quality and all natural scenes exhibit similar statistical properties. Natural scene statistics is successfully used in image quality assessment which is based on the hypothesis that introduction of distortion in an image causes deviation from statistical properties. Amount of deviation in the statistical property of an image is found to be proportional to the amount of distortion. A neural network-based image quality metric needs such natural scene statistical feature to predict the image quality blindly. This paper presents a new feature for colour image quality assessment that is extracted after decomposing given image into different frequency bands of hue plane. In future, this feature will be used in a classifier to evaluate colour image quality.