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Upadhyay G.,Defence Institute of Advance Technology | Nene M.J.,Defence Institute of Advance Technology
2016 IEEE International Conference on Recent Trends in Electronics, Information and Communication Technology, RTEICT 2016 - Proceedings | Year: 2016

Modern cryptography offers three goals of Confidentiality, Integrity and Availability, known as CIA triad. Confidentiality of any message or communication is secrecy of its content. All the modern cryptosystems provide cryptographic secrecy and not perfect secrecy. Two ingredients of perfect secrecy are truly random source and secure communication channel. Both are available in quantum computing paradigm. However, Quantum Computers are not yet commercially available. Certain time-tested cryptographic techniques in classical computing can be combined with principles of quantum computing to to achieve the goal of perfect secrecy. Theoretically, One Time Pad (OTP) is proven to be unconditionally secure. The paper suggests an hybrid approach to cryptography by generating OTP using quantum superposition states. The results of OTP generation are corroborated with theoretical values. The OTP so generated by realization of the suggested approach on a classical system is found to pass the test for randomness. © 2016 IEEE.


Pippal R.S.,ABV Indian Institute of Information Technology and Management | Jaidhar C.D.,Defence Institute of Advance Technology | Tapaswi S.,ABV Indian Institute of Information Technology and Management
Proceedings of the 2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012 | Year: 2012

In the present Internet age, one of the main challenging tasks is to provide confidentiality for user's transaction. Various authentication schemes have been proposed to secure the data from unauthorized users. One of the most prominent schemes is password based smart card authentication scheme used to withstand the possible attacks for verification table. However, most of these schemes are vulnerable to one or the other possible attacks. In this paper, highly secured smart card authentication scheme is proposed to resist all the identified attacks and satisfy the needs of user. Its security is based on one way hash function and the discrete logarithm problem. Security analysis proves that the given scheme is more secure as compared to other existing schemes. It can be easily extended to various applications such as Multi-server authentication, Internet protocol television broadcasting, Wireless communication and Healthcare applications, where the user needs to access data from server. © 2012 IEEE.


Pippal R.S.,ABV Indian Institute of Information Technology and Management | Tapaswi S.,ABV Indian Institute of Information Technology and Management | Jaidhar C.D.,Defence Institute of Advance Technology
Informatica (Ljubljana) | Year: 2012

In Internet Protocol Television (IPTV) broadcasting, service providers charge subscription fee by scrambling the program in Conditional Access System (CAS). This avoids unauthorized users to receive the programs. A smart card (CA card) is used to decrypt the Control Words (CWs) and transfer them back to Set-Top Box (STB) in order to descramble the scrambled program. This paper presents a secure mutual authentication and key exchange scheme between STB and smart card for IPTV broadcasting. Its security is based on one way hash function and the discrete logarithm problem. It allows subscribers to choose and change the password freely, provides dynamic session key agreement and mutual authentication between STB and smart card. Security analysis proves that the scheme is strong against subscriber and STB impersonation attacks, replay attack, stolen verifier attack, smart card loss attack, man-in-the-middle attack and attack on perfect forward secrecy which are considered as common threats in IPTV environment. Moreover, the scheme also prevents serious attacks such as smart card cloning and McCormac Hack attack particular to authentication using smart cards.


Sharma M.,Indian Institute of Technology Madras | Kumar B.V.R.,Indian Institute of Technology Madras | Kumar B.V.R.,Indian Institute of Technology Kanpur | Sangwan V.,Defence Institute of Advance Technology | Murthy S.K,Thapar University
World Journal of Modelling and Simulation | Year: 2015

An averaged two-fluid flow model for dispersed two-phase flows of Bubbles, Drops and Particles based on similarity criteria and mixture viscosity concept has been analyzed. Ordinary differential equations describing the relative velocities of liquid and gas phases together with the ordinary differential equation for the density of gas phase are considered as Initial Value Problems (IVPs). The approximate solutions of IVPs have been investigated by different numerical schemes to identify a reasonably efficient numerical scheme for future practical considerations. Further, based on modified Ishii et al.[8] model the effect of variation of void fraction and phase velocities of the fluids across the cross section of the pipe have been investigated. The equations of Kumar et al.[11] are used to calculate the Bubble size at the mixer orifice exit. Void fraction and slip at different locations are determined for a model of nitrogen - mercury system set up, where the mass fluxes varying from 0.125 to 2.302 kg/sm2 for nitrogen and 5.52×103 to 12.26×103 kg/sm2 for mercury. Finally, the predicted values have been compared with the experimental data. Also, influence of pressure and mass flow rates on gas and liquid velocities, void fraction, density of gas, friction and drag coefficients have been investigated at the end.


Patil S.,University of Pune | Datar S.,Defence Institute of Advance Technology | Rekha N.,CSIR - National Chemical Laboratory | Asha S.K.,CSIR - National Chemical Laboratory | And 2 more authors.
Nanoscale | Year: 2013

We propose enhanced charge storage capacity of nanoparticles based polymer films. A flat band voltage window varying from 5-7 V is obtained leading to a trapped charge density of the order of 1013 cm-2. These results vary for two distinct morphologies obtained due to decoration of a urethane-methacrylate comb polymer (UMCP) network by gold nanoparticles (AuNPs). Films have been further investigated for morphology, optical, charge storage, and electron transport properties using techniques like scanning electron microscopy (SEM), atomic force microscopy (AFM), absorption spectroscopy (UV-Vis), scanning tunneling microscopy/spectroscopy (STM/STS) and capacitance versus voltage (C-V) measurements. SEM and AFM confirm either the deposition of AuNPs inside the UMCP network or the formation of ring like structures depending on the deposition sequence. STS measurements performed on both films are compared with bare UMCP and AuNPs films. Current versus voltage (I-V) characteristics so obtained are discussed in the light of electron transport mechanisms in such materials. This journal is © 2013 The Royal Society of Chemistry.


Naik S.S.,Defence Institute of Advance Technology | Nene M.J.,Defence Institute of Advance Technology
Advances in Intelligent and Soft Computing | Year: 2012

Autonomous Under Water Sensor Networks UWSNs form distributed amorphous computing environments. Efficient resolution for an unreachable UWSN which includes failure-prone nodes will require strategies that are as simple as possible in computations and local communications, to facilitate self-organization. Localization of Under Water Sensor Networks UWSNs is the most challenging and essential task. In this paper we propose a localization technique for UWSNs which is implemented using a self-organizing localizing algorithm. When acoustic waves propagate through a medium, it travels with varying speed. This change in speed of sound wave is highly influenced by ocean parameters. In our proposed work we study the effect of sound speed on localization algorithm for Underwater Sensor Networks. The results show that our proposed localization technique performs better. © 2012 Springer-Verlag GmbH.


Ghosh M.,Explosives Research & Development Laboratory | Venkatesan V.,Indian Institute of Technology Madras | Mandave S.,Explosives Research & Development Laboratory | Banerjee S.,Defence Institute of Advance Technology | And 3 more authors.
Crystal Growth and Design | Year: 2014

This article presents evidence of a possible route to the formation of ?- and ?-polymorphic phases of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) studied through CL-20 solution using a reverse and normal precipitation method. Reverse precipitation with instant addition facilitated the opportunity to track the crystal phases from their immediate formation to the end of phase stabilization. Precipitation under apparent conditions to achieve ?- or ?-phases showed the initial occurrence of a metastable ?-phase and subsequent transformation to the intended stable phases. The ?-phase showed sufficiently longer stability while under specified conditions for ?- than in a hydrated medium set to obtain the ?-phase. Transformation of fine needle-shaped ?-CL-20 crystals to uniform diamond-shaped ?- or bipyramidal ?-habit had been observed to pass through an equilibrium state of dissolution and reprecipitation. This work also elaborates the effect of crystallization methodology on conversion time. Vibrational spectroscopy and microscopic techniques were employed to track time-dependent polymorphic conversions. A drastic reduction in ? ? ? conversion time, from 160 to 10 min, could have been affected by using ultradispersed seed crystals. We thus also demonstrated a hazard free nongrinding method to prepare ?-CL-20 with particle size < 10 ?m through precipitation and their effect on thermal stability and mechanical sensitivity. © 2014 American Chemical Society.


Sahoo P.K.,Indian Institute of Technology Bombay | Panda H.S.,Indian Institute of Technology Bombay | Panda H.S.,Defence Institute of Advance Technology | Bahadur D.,Indian Institute of Technology Bombay
Materials Chemistry and Physics | Year: 2013

We report the intercalation of dexamethasone sodium phosphate drug in Mg/Al layered double hydroxides (LDHs) through co-precipitation technique. The as-synthesized nanohybrid was characterized by XRD, FTIR and thermal analysis techniques, which reveal that the dexamethasone phosphate anions are accommodated within the brucite layers. The shifting in the stretching frequency of phosphate anion of the drug provides strong evidence that the drugs are bonded to LDHs through electrostatic force. The surface charge analysis suggested the possibility of charge manipulation in LDHs system by varying intercalated anions. In-vitro release study of as-synthesized nanohybrid particles suggests a significant reduction in release rate of dexamethasone phosphate anions from Mg/Al-Dexa LDHs and is due to confinement of drugs in the interlayer. The mechanism of drugs diffusion in nanohybrid is studied by using dissolution-diffusion kinetic model, which reveals that it is probably due to dissolution and intra-particle diffusion of anions in the physiological medium. © 2013 Elsevier B.V. All rights reserved.


Naik S.S.,Defence Institute of Advance Technology | Nene M.J.,Defence Institute of Advance Technology
Proceedings of the 2012 International Conference on Recent Advances in Computing and Software Systems, RACSS 2012 | Year: 2012

Autonomous Under Water Sensor Networks UWSNs form distributed amorphous computing environments. Efficient resolution for an unreachable UWSN which includes failure-prone nodes will require strategies that are as simple as possible in computations and local communications, to facilitate self-organization. In this paper, we propose a self organizing localization algorithm for localization in distributed UWSN. Unlike in terrestrial positioning, Global Positioning System GPS do not work efficiently for underwater scenario. Also available localization schemes are not well suited for deep underwater. We propose an efficient localization technique for underwater which also eliminates errors encountered during localization process. The proposed localization algorithm and localization method which works for terrestrial and underwater is extensively simulated. The results show that our proposed localization technique performs better. © 2012 IEEE.


Panda H.S.,Defence Institute of Advance Technology | Panda H.S.,Indian Institute of Technology Bombay | Bahadur D.,Indian Institute of Technology Bombay
Materials Research Bulletin | Year: 2012

We report a new magnetic nanohybrid material to make layered double hydroxides (LDHs) as a targeted drug carrier. The magnetite prepared using a modified conventional coprecipitation technique was embedded in to the fluvastatin intercalated hydrophobic anionic clay through one step process. XRD analysis shows a decrease in lattice parameter of magnetite which is due to generation of stress by the LDHs. Filtered HRTEM image indicates that the magnetic nanohybrid consists of well-defined composite structure and the diameter is around 13 nm. Further, it is shown through magnetisation and ESR study that the exchange interaction between magnetite and drug intercalated LDHs layers shifted the T B of Fe 3O 4 in magnetic nanohybrid to lower temperatures. In vitro release study of nanohybrid particles at pH 7.4 in PBS and at 37 °C show a faster release for magnetic nanohybrids. The mechanism is probably due to combined effect of interparticle and heterogeneous diffusion via anionic exchange. © 2012 Elsevier Ltd. All rights reserved.

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