Browsing by Author "Deb, S."

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bFLEX- γ : A Lightweight Block Cipher Utilizing Key Cross Approach via Probability Density Function
(Springer Science and Business Media Deutschland GmbH, 2022) Das, A.K.; Kar, N.; Deb, S.; Singh, M.P.
Most of the symmetric lightweight cryptosystems keep their block length fixed throughout the entire encryption making the cryptanalysis straightforward. It is of utmost importance to change the block size during the encryption process to introduce complexity in the cryptanalysis process. Therefore, a novel block cipher-based cryptosystem bFLEX-γ has been proposed in which the bit length of the ciphertext gets changed in the intermediate rounds. The key scheduling of the proposed cryptosystem takes place with the random diffusion of the auxiliary vector anticipated by a key crossing technique and linear shift feedback register (LFSR). Simulation results indicate that the proposed bFLEX-γ gives a satisfying level of security and robustness against linear cryptanalysis, differential cryptanalysis, eXtended Sparse Linearization (XSL) attacks and regression analysis attacks. The proposed cryptosystem is also validated by 0-1 balance factor of 0.020925 % and a kurtosis of 2.55, showing platykurtic in nature. All the statistical features and efficiency confirm that bFLEX-γ is very suitable for lightweight applications demanding data confidentiality. © 2022, King Fahd University of Petroleum & Minerals.
Deriving temporal trends in user preferences through short message strings
(2016) Deb, S.; Mohan, S.; Venkatraman, P.; Bindu, P.V.; Santhi Thilagam, P.
Short message strings are widely prevalent in the age of social networking. Taking Facebook as an example, a user may have many other users in his contact list. However, at any given time frame, the user interacts with only a small subset of these users. In this paper, we propose a recommender system that determines which users have common interests based on the content of the short message strings of different users. The system calculates the similarity between two users based on the contents of short message strings by the users over a certain time period. A similarity measure based on short message strings must be temporal study as the contents of the short messages vary rapidly over time. Experimental study is conducted in the Facebook domain using status updates of users. � 2016 IEEE.
Deriving temporal trends in user preferences through short message strings
(Institute of Electrical and Electronics Engineers Inc., 2016) Deb, S.; Mohan, S.; Venkatraman, P.; Bindu, P.V.; Santhi Thilagam, P.S.
Short message strings are widely prevalent in the age of social networking. Taking Facebook as an example, a user may have many other users in his contact list. However, at any given time frame, the user interacts with only a small subset of these users. In this paper, we propose a recommender system that determines which users have common interests based on the content of the short message strings of different users. The system calculates the similarity between two users based on the contents of short message strings by the users over a certain time period. A similarity measure based on short message strings must be temporal study as the contents of the short messages vary rapidly over time. Experimental study is conducted in the Facebook domain using status updates of users. Â© 2016 IEEE.
Total internal reflection quasiphase matching-based broadband second harmonic generation in a plane-parallel uniaxial crystal of lithium niobate
(SPIE spie@spie.org, 2018) Barma, M.D.; Deb, S.; Saha, A.
The present work analytically investigates the generation of broadband second harmonic (SH) using total internal reflection (TIR) quasiphase matching technique in a plane-parallel uniaxial crystal having optic axis nonparallel with respect to the horizontal base. A computer-aided simulation has been performed using lithium niobate as the nonlinear material to determine the possibility of generating broadband SH intensity when broadband fundamental laser radiation is allowed to undergo TIR inside the crystal. The simulated results indicate a peak conversion efficiency of 5.22% with a spectral bandwidth (BW) of 116 nm, centered at 2.258 ?m in a 10-mm-long slab. The effect of variation in operating temperature, crystal length, crystal thickness, angle of deviation of optic axis, and angle of incidence of fundamental beam at the air-prism interface on efficiency and BW of resulting SH output has been studied. © 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).