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

Digital Payment Continuance Intention Using Mecm: The Role of Perceived Experience

Purpose:  The purpose of this paper is to examine the determinants of digital payment continuance intention, which is essential for long term success.   Theoretical framework:  Expectancy confirmation theory developed by Oliver (1980) and then expectancy confirmation model by Bhattacherjee (2001) examined the need of continuance intention. Looking at the significance of digital payment through Mobile phones, Mobile expectation confirmation model and role of perceived experience need to be examined for continuance intention.   Design/methodology/approach:  Empirical data from 400 Indian users, who had prior experience with digital payment were analysed by using Confirmed factor analysis and structural equation modelling.   Findings:  The results confirmed that Mobile expectancy confirmation had exploratory power in explaining continuance intention, perceived usefulness, perceived experience and satisfaction of digital payment. Furthermore, perceived experience has moderating role in explaining the relationship between confirmation and continuance intention towards digital payment.   Research, Practical & Social implications:  The findings help financial service providers to understand the significance of meeting customer expectation and satisfying their need by enhancing perceived experience and usefulness, leading to favourable attitude towards digital payment and continuance intention.   Originality/value:  This study was based on MECM and contributing to the limited body of research on continuance intention towards digital payment. Furthermore, the role perceived experience was examined to establish the relationship between confirmation and continuance intention along with other variables like perceived usefulness and satisfaction

Partial purification and sugarcane bagasse induction of extracellular thermostable Amylase by Bacillus sp. under submerged fermentation

Enzyme with relatively low stability shows an industrial incompetence which creates an urgent need of potential enzymes with high stability in a cost effective way. Thus, thermostable enzymes derived from microorganism are the alternative resources for convenient industrial application. Our present study was aimed for production of thermostable amylase with wide range of pH and temperature stability, and induction of over production of the enzyme by using sugarcane bagasse as the sole carbon source. The strain was an isolate from railway track of Cuttack railway station, Odisha, India. Morphologically the strain was identified as Bacillus species by gram staining, and a potential amylase producer in normal Luria Bertani (LB) broth at 60°C. The optimum extracellular amylase production observed was 0.085 U/ml after 6 hours at 60°C under submerged culture condition. Extracellular amylase was precipitated through ammonium salt fractionation, and partially purified by Sephadex G-50 column chromatography. The partially purified protein under SDS-PAGE was found to be resolved in to three distinct bands of molecular weights approximately 108.69 kDa, 78.12 kDa and 65.63 kDa. The amylase enzyme showed wide range of temperature stability till 90°C and pH stability from pH 5 to 8, respectively. However, the optimum stability of amylase was found at 90°C in pH 8. The induction study has been carried out with abundantly available agro-industrial waste product sugarcane bagasse for over production of amylase in four different concentrations (0.5%, 1.0%, 2.0%, and 5.0%). The enzyme production was enhanced with increase in concentration of sugarcane bagasse as compared to the control LB medium. The highest amylase production observed was 0.190 U/ml with 5.0% inducible substrate after 10 hours of submerged culture condition at 60°C. Thus, the strain is found to be a potential producer of extracellular amylase and further studies are needed for the optimization of increased production and induction of other possible enzymes by different inducible substrates