New Convertible Authenticated Encryption Scheme with Message Linkages

The digital signature provides the signing message with functions like authentication, integration and non-repudiation. However, in some of the applications, the signature has to be verified only by specific recipients of the message and it should be hidden from the public. For achieving this, authenticated encryption systems are used. Authenticated Encryption schemes are highly helpful to send a confidential message over an insecure network path. In order to protect the recipients benefit and for ensuring non-repudiation, we help the receiver to change the signature from encrypted one to an ordinary one. With this we avoid any sort of later disputes. Few years back, Araki et al. has proposed a convertible authenticated scheme for giving a solution to the problem. His scheme enables the recipient to convert the senders signature into an ordinary one. However, the conversion requires the cooperation of the signer. In this thesis, we present a convertible authenticated encryption scheme that can produce the ordinary signature without the cooperation of the signer with a greater ease. Here, we display a validated encryption plan using message linkages used to convey a message. For the collector's advantage, the beneficiary can surely change the encrypted signature into an ordinary signature that which anyone can check. A few attainable assaults shall be examined, and the security investigation will demonstrate that none of the them can effectively break the proposed plan

Studies on some homo and hetero trinuclear complexes of nickel(II), cobalt(II) and copper(II) with 1,8-bis(2'-oxophenyl)2,3,6,7-tetraza-4,5-dimethyl-1,3,5,7-octatetraene (BTDO)

788-791A few homo/hetero trinuc1ear complexes of the type [MNiM(BTDO)2X2(H2O)4] nH2O [where M = nickel(II), cobalt(II) and copper(II), X = cr or NO, n = 0, or 0.5 and BTDO = 1,8-bis(2'-oxophenyl)-2,3,6, 7-tetraza4,5-dimethyl-1 ,3,5,7-octatetraene] have been isolated in a stepwise reaction from the precursor nickel bis(diacetyldihydrazone) complexes. These have been characterised on the basis of elemental analyses, spectral and magnetic properties, conductivity measurements and thermal analyses. All the complexes contain coordinated water. The metal centres have an octahedral environmental around them

Phase Formation and Dielectric Studies of Some BaO−TiO2−ZrO2BaO-TiO_2-ZrO_2 Based Perovskite System

High permittivity barium titanate zirconate (BTZ) is often used for dielectrics in commercial multilayer ceramic capacitors, actuators applications, and is a highly promising material for dynamic random access memory (DRAM) and microelectromechanical system (MEMS) applications due to its very stable, high insulating characteristic against voltage. Especially, the material is promising for environmental friendly application in compared to Lead (Pb) based compositions. Different solid solutions in the system have been synthesized via solid state reaction route. Detailed phase formation behaviors of the solid solutions were investigated through; (i) phase identification, (ii) phase quantity determination, (iii) change in lattice parameters and crystallite sises, (iv) evolution of phase formation kinetics and reaction mechanism, and (v) structure and microstructure evolution by Rietveld refinement method. The study on reaction mechanism concludes that; titanates form more easily..

NEUROPROTECTIVE EFFECT OF METHANOLIC EXTRACT OF SARGASSUM WIGHTII ON HALOPERIDOL INDUCED CATALEPSY AND TARDIVE DYSKINESIA IN ALBINO RATS

Objective: The present study was designed to evaluate the neuroprotective effect of methanolic extract of Sargassum wightii on haloperidol-induced catalepsy and tardive dyskinesia in Wistar albino rats. Methods: In this study, thirty Wistar albino rats were randomly divided into six groups. Gr-I served as control. Haloperidol (1 mg/kg intraperitoneally) was administered to rats of Gr-II to Gr-V for twenty-one consecutive days to induce catalepsy and tardive dyskinesia. Animals of Gr-II to Gr-V were orally administered with vehicle, levodopa carbidopa combination (30 mg/kg), Sargassum extract 200 and 400 mg/kg respectively. All the drugs and vehicles were given orally one hour before haloperidol injection for twenty one consecutive days. The cataleptic scores were recorded using standard bar test. Tardive dyskinesia was assessed in terms of vacuous chewing movement (VCM) and tongue protrusion (TP) scores. After behavioural testing, all animals were sacrificed on twenty-second day and various biochemical parameters like MDA, SOD and GSH were estimated in brain tissue. Results: Chronic administration of haloperidol significantly increased cataleptic scores, VCM and TP scores. (p<0.001) Sargassum wightii extract (400 mg/kg) significantly inhibited haloperidol-induced catalepsy, VCM and TP (p<0.001) Haloperidol increased MDA and decreased SOD and GSH in brain tissue to a highly significant extent (p<0.001) Sargassum extract at 400 mg/kg also significantly reversed the haloperidol-induced alteration in brain oxidative stress markers. Conclusion: Sargassum wightii inhibits haloperidol-induced catalepsy and tardive dyskinesia. Thus it may be used as a unique therapeutic adjunct for the prevention of neuroleptic-induced extrapyramidal symptoms, however, it has to be explored more

Assessment of heavy metals in the surrounding soils and their bioconcentrations in few plants near Kathajodi river, Odisha, India

The present study was carried out mainly concentrate on assessment of heavy metal in the surrounding soils and their bioconcentration in the different plants near Kathajodi River. Soil and plant samples were collected along the Kathajodi river, Odisha, India. It was found that the dominance of heavy metals follows a decreasing order. The metal concentrations measured in soil at all location generally decreased in the order; Fe > Mn > Ni> Pb> Cu> Zn> Cd. Highest heavy metal concentration in river bank soil Cd (0.72±0.05 mgkg-1); Ni (3.85±0.15 mgkg-1); Cu (1.66±0.15 mgkg-1); Zn (1.54±0.16 mgkg-1); Pb (4.11±0.14 mgkg-1); Fe (142.0±1.16 mgkg-1); Mn (37.30±1.16 mgkg-1) at different site . Among all the grass species I. laxum has the higher affinity for the accumulation of Cd (0.85±0.05) followed by Zn, Pb and Cu. This study indicates that bio concentration of heavy metals in the study area show preferential Cd uptake in the plants followed by Zn, Pb and it may lead to accumulates in the exposed plant part posing risk along the food chain. This calls for immediate action to be implemented to carry out necessary environment mitigation measures for the river as it can be attributed the discharge of untreated domestic waste and effluents in the river