16 research outputs found
A Secured Authentication Protocol for Wireless Sensor Networks Using Elliptic Curves Cryptography
User authentication is a crucial service in wireless sensor networks (WSNs) that is becoming increasingly common in WSNs because wireless sensor nodes are typically deployed in an unattended environment, leaving them open to possible hostile network attack. Because wireless sensor nodes are limited in computing power, data storage and communication capabilities, any user authentication protocol must be designed to operate efficiently in a resource constrained environment. In this paper, we review several proposed WSN user authentication protocols, with a detailed review of the M.L Das protocol and a cryptanalysis of Das’ protocol that shows several security weaknesses. Furthermore, this paper proposes an ECC-based user authentication protocol that resolves these weaknesses. According to our analysis of security of the ECC-based protocol, it is suitable for applications with higher security requirements. Finally, we present a comparison of security, computation, and communication costs and performances for the proposed protocols. The ECC-based protocol is shown to be suitable for higher security WSNs
Magnetic Properties of Ternary Gallides of type RNi4Ga (R = Rare earths)
The magnetic properties of RNi4Ga (R = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm
and Lu) compounds have been investigated. These compounds form in a hexagonal
CaCu5 type structure with a space group P6/mmm. Compounds with the magnetic
rare earths, R = Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm, undergo a ferromagnetic
transition at 5 K, 17 K, 20 K, 19 K, 12 K, 3.5 K, 8 K and 6.5 K, respectively.
The transition temperatures are smaller compared to their respective parent
compounds RNi5. PrNi4Ga is paramagnetic down to 2 K. LaNi4Ga and LuNi4Ga are
Pauli paramagnets. All the compounds show thermomagnetic irreversibility in the
magnetically ordered state except GdNi4Ga.Comment: 14 Pages 6 Figures 1 Tabl