Abstract In the recent period, Grid computing has emerged as the incremental level of distributed computing. It integrates the users and resources which are scattered in various domains. The Grid and its related technologies will be used only if the users and the providers mutually trust each other. The system must be as reliable and robust as of their own. The... In the recent period, Grid computing has emerged as the incremental level of distributed computing. It integrates the users and resources which are scattered in various domains. The Grid and its related technologies will be used only if the users and the providers mutually trust each other. The system must be as reliable and robust as of their own. The reliability can be defined as the probability of any process to complete it’s task successfully as the way it was expected. In grid the reliability of any transaction can be improved by considering trust and reputation. Trust depends on one’s own individual experiences and referrals from other entities. This paper proposes a model which improves reliability in grid by considering reputation and trust. Read More Read Less

Abstract A proxy blind signature scheme is a special form of blind signature which allows a designated person called proxy signer to sign on behalf of two or more original signers without knowing the content of the message or document. It combines the advantages of proxy signature and blind signature scheme and satisfies the security properties of both proxy and blind... A proxy blind signature scheme is a special form of blind signature which allows a designated person called proxy signer to sign on behalf of two or more original signers without knowing the content of the message or document. It combines the advantages of proxy signature and blind signature scheme and satisfies the security properties of both proxy and blind signature scheme. This paper describes an effcient simple proxy blind signature scheme. The security of the scheme is based on Elliptic Curve Discrete Logarithm Problem(ECDLP). ECC offers security equivalent to RSA and DSA while using far smaller key sizes. The benefits of this higher-strength per-bit include higher speeds, lower power consumption, bandwidth savings, storage effciencies, and smaller certificates. This can be implemented in low power and small processor mobile devices such as smart card, PDA etc. Read More Read Less

Abstract The central challenge with computer security is determining the difference between normal and potentially harmful activity. A promising solution is emerging in the form of Artificial Immune Systems (AIS). These include the theories regarding how the immune system responds to pathogenic material. This paper takes relatively new theory: the Danger theory and Dendritic cells, and explores the relevance of those... The central challenge with computer security is determining the difference between normal and potentially harmful activity. A promising solution is emerging in the form of Artificial Immune Systems (AIS). These include the theories regarding how the immune system responds to pathogenic material. This paper takes relatively new theory: the Danger theory and Dendritic cells, and explores the relevance of those to the application domain of security and evaluating on the Kdd’99 data. Read More Read Less

Abstract In the period of increasing data transfers, it is necessary to protect data so that there is compatibility and interoperability between the communications With respect to the general information hiding problem, a tradeoff is involved between robustness, visibility and capacity. There are many watermarking techniques for data hiding and each of them has some advantages and disadvantages. The robust method... In the period of increasing data transfers, it is necessary to protect data so that there is compatibility and interoperability between the communications With respect to the general information hiding problem, a tradeoff is involved between robustness, visibility and capacity. There are many watermarking techniques for data hiding and each of them has some advantages and disadvantages. The robust method for data hiding is embedding the hidden data in the choice of quantizer for the host data. A quality factor is determined to get an appropriate quantization matrix. To modify the bit streams directly during embedding cause unacceptable distortions to cover images. We had developed DCT based entropy Threshold method which determines threshold for each block and only those blocks are selected for whose entropy exceeds by a predetermined threshold for embedding the data. The experimental results show that the proposed scheme has good imperceptibility Read More Read Less

Abstract Intrusion detection has, over the last few years, assumed paramount importance within the broad realm of network security and it has significant impact on wireless ad hoc networks. These networks do not have an underlying infrastructure and the network topology constantly changes. The inherently vulnerable characteristics of wireless ad hoc networks make them susceptible to attacks, and it may be... Intrusion detection has, over the last few years, assumed paramount importance within the broad realm of network security and it has significant impact on wireless ad hoc networks. These networks do not have an underlying infrastructure and the network topology constantly changes. The inherently vulnerable characteristics of wireless ad hoc networks make them susceptible to attacks, and it may be difficult to control before any prevention works out. Secondly, with so much advancement in hacking, if attackers use sophisticated technology, they will eventually succeed in infiltrating the system. This makes it important to constantly or periodically monitor what is taking place on a system and look for suspicious behavior. Intrusion detection systems (IDS)monitor audit data, look for intrusions to the system, and initiate a proper response. In this paper, we present a method for determining critical path that use the distributed security scheme to find out the malicious node. The nodes with the help of the critical links will find out the malicious node using distributed security scheme and inform all the nodes about malicious node. The simulation results describe the details of the critical path test. Read More Read Less