4 papers
Probing of large interfacial contribution to spin orbit coupling in CoFeB/Ta heterostructure by ultrafast THz emission spectroscopy
Sandeep Kumar, Sunil Kumar
Ultrafast THz radiation generation from ferromagnetic/nonmagnetic bilayer heterostructure-based spintronic emitters generally exploits the conversion from spin- to charge-current w…
A Note on Fuzzy Automorphism and Inner Automorphism of Groups
Shiv Narain, Sunil Kumar, Sandeep Kumar +1
The fuzzification of classical set theory came into existence when Zadeh [1] laid down the concept of a fuzzy set as a generalization of a crisp set. The objective of this paper is…
Group ring based public key cryptosystems
Gaurav Mittal, Sunil Kumar, Shiv Narain +1
In this paper, we propose two cryptosystems based on group rings and existing cryptosystem. First one is Elliptic ElGamal type group ring public key cryptosystem whose security is…
A Vector Space Approach to Generate Dynamic Keys for Hill Cipher
Sunil Kumar, Sandeep Kumar, Gaurav Mittal +1
In this paper, a variant of the Hill cipher is proposed. In the classical Hill cipher, an invertible matrix is used for encryption but the scheme is vulnerable to the known-plainte…