Since their appearance at the dawn of the second millennium, Delay or Disruption Tolerant Networks (DTNs) have gradually evolved, spurring the development of a variety of methods and protocols for making them more secure and resilient. In this context, perhaps, the most challenging problem to deal with is that of cryptographic key management. To the best of our knowledge, the work at hand is th...

In this paper we propose a new protocol to manage multicast key distribution. The protocol is based on the use of orthogonal systems in vector spaces. The main advantage in comparison to other existing multicast key management protocols is that the length and the number of the messages which have to be sent are considerably smaller. This makes the protocol especially attractive when the number ...

Wireless sensor networks consist of sensor nodes with limited computational and communication capabilities. This paper deals with mobile sensors which are divided into clusters based on their physical locations. Efficient ways of key distribution among the sensors and inter and intra cluster communications are examined. The security of the entire network is considered through efficient key mana...

Various network applications require sending data onto one or many members, maintaining security in the large groups is one of the major obstacles for controlling access. Unfortunately, IP multicast is not providing any security over the group communication. Group key management is a fundamental mechanism for secured multicast. This paper presents relevant group key management protocols. Then, ...

This paper presents a new crypto scheme whose title promises it to be so boring that no-one will bother reading past the abstract. Because of this, the remainder of the paper is left blank.

The question often arises of whether or not a given security system requires some form of automated key management, or whether manual keying is sufficient. This memo proposes guidelines for making such decisions. The presumption is that when symmetric cryptographic mechanisms are used in a protocol, then automated key management is generally but not always needed. If manual keying is proposed, ...

Many ways are proposed to reduce the secret storage space of access control in hierarchy, but no one optimizes the public parameters which are only modified by CA. Length of each public parameter is one important factor for the size and utilization of storage space. The frequent changes on the maximum length of public parameter will be a weakness for stability, in dynamic key management. Number...

nowadays organizations seriously search for their overall improvements with the aim of achieving to the organizational excellence. organizations can’t manage their programs efficiently without using comprehensive model due to examine and reform their programs. because of these needs and problems, in this thesis we are analyzing the performance management system at the department of the assessme...

Wireless sensor networks are composed of very small devices, called sensor nodes,for numerous applications in the environment. In adversarial environments, the securitybecomes a crucial issue in wireless sensor networks (WSNs). There are various securityservices in WSNs such as key management, authentication, and pairwise keyestablishment. Due to some limitations on sensor nodes, the previous k...