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Articles by R. Sridevi
Total Records ( 3 ) for R. Sridevi
  R. Sridevi , P. Philominathan , Padmapriya Praveenkumar , John Bosco Balaguru Rayappan and Rengarajan Amirtharajan
  Background: The agenda of secret and secured communication is in the lead list of digital communication schemes. Image encryption plays a lead role in both spatial and transforms domains. Materials and Methods: In this study, logistic and standard coupled mapping were employed on a pre and post shuffled image to attain the higher-order cryptic image to convey information between private nodes. The initial conditions to the maps were generated by a trigonometric function, which will provide sternness against hackers. Results: To analyse the rigidness of the implemented algorithm, the standard metrics, that is the Unified Average Changing Intensity (UACI), Number of Pixels Change Rate (NPCR), entropy, correlation values, pixel distribution and histogram tests were estimated. The results were compared with the existing literature and found to be superior or comparable. Conclusion: First, the key space is 2256, which is considerably resistive to brute-force attack. Second, the obtained NPCR, entropy, correlation coefficient and UACI values of 99.6901, 7.99, -0.0015 and 33.44, respectively, prove that the proposed method resists statistical and differential attacks.
  Rengarajan Amirtharajan , Imaculate Rosaline , Rengaraja Swamy , Sai Pavan , R. Sridevi and J.B.B. Rayappan
  The use of information over internet and our dependence on the computing machines has drastically increased with the advancements in technology. As a result, the storage and transmission of the ever increasing volumes of data in an effective way has become a high priority issue. The very systems which are boon to us are also being misused by many to cause harm. Thus, security is a major issue as far as the information is concerned. Thus, it becomes the responsibility of the parties involved in secret communication to arrange for the necessary security, preventing the sniffing by rogue entities. Advancement in digital communication technology along with internet makes data transfer easy and vulnerable to interception and modification by sneakers. Cryptography and steganography are ways of encrypting and hiding data. While Cryptography hides the essence of the data under a cover, like an encrypted text or periodic noises in a digital signal, steganography hides the fact of data itself. The information is more secure when both these techniques are used together. That is, even if the hidden information is found out, it will be encrypted. In this paper, it is proposed to explore the cover generation method. It uses information as data on covers like Image-cover, Circuit-cover Graph-cover, Chess-cover and Questionnaire etc and does not produce noise. Thus, noiseless steganography (noistega) is a fruitful option for data transmission in secured manner.
  Savitha G. Joshi , M.M. Tejashwini , N. Revati , R. Sridevi and D. Roma
  Feather constitutes over 90% protein, the main component being beta-keratin, a fibrous and insoluble structural protein extensively cross linked by disulfide bonds. This renders them resistant to digestion by animal, insects and proteases leading to serious disposal problems. In addition to this, feather waste is produced at the rate of 22 million kg per year (US alone). Use of keratinolytic microorganisms for feather degradation is an economical, environmental friendly alternative. Keratinases which are produced by these keratinolytic organisms could be used to degrade feather waste and further the digested products could be an excellent material for producing animal feed, fertilizers or natural gas. A feather-degrading bacterium was isolated from poultry waste. This bacterium was grown in basal media with feathers as its primary source of carbon, nitrogen, sulfur and energy. The organism is rod shaped, highly motile, endospore forming, catalase positive and gram negative. Phenotypic characterization carried out in our laboratory showed that this novel gram negative bacterium belongs to Bacillus genus. The organism is designated as Bacillus and named as Bacillus sp PW-1. The isolated strain has activity of 50 U/ml. This novel keratinolytic isolate could be a potential candidate for degradation and utilization of feather keratin.
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