Today, reputation systems such as ebay’s prominent ”Feedback Forum” are becoming more widespread. In such a system, reputations are formed by aggregating ratings participants give and receive. These reputations, however, are bound to a specific platform preventing participants from taking and showing their hard-earned reputations elsewhere. That makes the reputations less valuable and leaves th...

background and purpose: to determine an appropriate financial model for the health system of iran, several studies have been conducted. but it seems that these studies were not comprehensive and further investigation is required. so to design a valid and enforceable mechanism, the study of policy interventions will be considered through consensus of all stakeholders. this investigation was done...

We introduce a new cryptographic technique that we call universal re-encryption. A conventional cryptosystem that permits reencryption, such as ElGamal, does so only for a player with knowledge of the public key corresponding to a given ciphertext. In contrast, universal re-encryption can be done without knowledge of public keys. We propose an asymmetric cryptosystem with universal re-encryptio...

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...

Information technology plays a significant role in a global organization. Senior executives of these organizations need constant and timely access to global information for making decisions. This information originates in different places worldwide for a global organization and needs to be organized before it can be used for decision-making. The organization and management of global corporate d...

Pharmaceutical industries are continuously seeking out new strategies to improve their operations and gain a competitive advantage. Maintenance tends to be a key management issue for many pharmaceutical companies. Proper maintenance management requires information about maintenance performance for the planning and controlling of maintenance processes. However, it is generally difficult to recon...