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Articles by N. Krishnan
Total Records ( 2 ) for N. Krishnan
  A. Senthil Arumugam and N. Krishnan
  A major concern nowadays for any biometric credential management system is its potential vulnerability to protect its information sources; i.e., protecting a genuine user’s template from both internal and external threats. These days’ biometric authentication systems face various risks. One of the most serious threats is the vulnerability of the template's database. An attacker with access to a reference template could try to impersonate a legitimate user by reconstructing the biometric sample and by creating a physical spoof. Susceptibility of the database can have a disastrous impact on the whole authentication system. The potential disclosure of digitally stored biometric data raises serious concerns about privacy and data protection. Therefore, a method which would integrate conventional cryptography techniques with biometrics is proposed. In this research, a biometric crypto system is presented which encrypts the biometric template and the encryption is done by generating pseudo random numbers, based on non-linear dynamics.
  N. Krishnan , S. Ramanathan , S. Sasidharan , V. Murugaiyah and S.M. Mansor
  The aim of the present study was to characterize the antimicrobial properties of various crude extracts of the Cassia spectabilis leaf against bacteria and yeast. Acetone, n-hexane, dichloromethane, ethyl acetate and methanol extracts of C. spectabilis leaves were evaluated in vitro against Gram positive bacteria (Bacillus subtilis and Staphylococcus aureus), Gram negative bacteria (Escherichia coli, Salmonella typhi and Pseudomonas aeroginosa) and yeast (Candida albicans). The Minimum Inhibitory Concentration (MIC), Minimum Bactericidal Concentration (MBC) and Minimum Fungicidal Concentration (MFC) were determined using micro dilution assay. Methanol showed the highest yield (14.12%) followed by dichloromethane (8.37%), acetone (6.66%), ethyl acetate (4.76%) and n-hexane (1.80%). Acetone and methanol crude extracts showed a good antimicrobial activity with MIC values ranging from 0.625 to 2.5 mg mL-1 and MBC or MFC values ranging from 1.25 to 5 mg mL-1. The MIC, MFC and MBC values of these extracts were 10 to 80 times less potent than standard antimicrobial drugs, amoxilin and miconazole nitrate.
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