A key Management Scheme for Access Control to GNSS Services

Conditional access is a challenging problem in GNSS scenarios. Most key management schemes present in literature can not cope with all GNSS related issues, such as extremely low bandwidth, stateless receivers and the absence of an aiding channel. After assessing existing techniques, a novel key management scheme called RevHash has been devised with particular emphasis on guaranteeing revocation capabilities to the system, in order for it to be robust against anomalies and attacks

Cloud-centric blockchain public key infrastructure for big data applications

A cloud-based public key infrastructure (PKI) utilizing blockchain technology is proposed. Big data ecosystems have scalable and resilient needs that current PKI cannot satisfy. Enhancements include using blockchains to establish persistent access to certificate data and certificate revocation lists, decoupling of data from certificate authority, and hosting it on a cloud provider to tap into its traffic security measures. Instead of holding data within the transaction data fields, certificate data and status were embedded into smart contracts. The tests revealed a significant performance increase over that of both traditional and the version that stored data within blocks. The proposed method reduced the mining data size, and lowered the mining time to 6.6% of the time used for the block data storage method. Also, the mining gas cost per certificate was consequently cut by 87%. In summary, completely decoupling the certificate authority portion of a PKI and storing certificate data inside smart contracts yields a sizable performance boost while decreasing the attack surface

Data Sharing Securely for Administrators of Dynamic Groups in Cloud

In recent year’s cloud computing is popularly increased day by day in the form of securing, updating, storing, sharing confidential data. Today’s condition about data security in cloud computing is very bad thing happens when people work on cloud for confidential company data. System provides scheme for secured data sharing when we use dynamic groups in an un-trusted clouds. In a system, users can share data in other groups without revealing identity privacy to the cloud. Efficient user revocation and new user joining is also supported by the system. Public revocation list is used for efficient user revocation without updating the private keys of the other users. New users before participation can decrypt directly. User within a group is identified by a group signature. Also public revocation list is used. System is a secure data sharing scheme in a multiple group policy. DOI: 10.17762/ijritcc2321-8169.15014

A Survey of Access Control Models in Wireless Sensor Networks

Copyright 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/)Wireless sensor networks (WSNs) have attracted considerable interest in the research community, because of their wide range of applications. However, due to the distributed nature of WSNs and their deployment in remote areas, these networks are vulnerable to numerous security threats that can adversely affect their proper functioning. Resource constraints in sensor nodes mean that security mechanisms with a large overhead of computation and communication are impractical to use in WSNs; security in sensor networks is, therefore, a challenge. Access control is a critical security service that offers the appropriate access privileges to legitimate users and prevents illegitimate users from unauthorized access. However, access control has not received much attention in the context of WSNs. This paper provides an overview of security threats and attacks, outlines the security requirements and presents a state-of-the-art survey on access control models, including a comparison and evaluation based on their characteristics in WSNs. Potential challenging issues for access control schemes in WSNs are also discussed.Peer reviewe

An efficient self-healing key distribution scheme

Self-healing key distribution schemes enable a group user to recover session keys from two broadcast messages he received before and after those sessions, even if the broadcast messages for the middle sessions are lost due to network failure. These schemes are quite suitable in supporting secure communication over unreliable networks such as sensor networks and ad hoc networks. An efficient self-healing key distribution scheme is proposed in this paper. The scheme bases on the concept of access polynomial and self-healing key distribution model constructed by Hong et al. The new scheme reduces communication and computation overheads greatly yet still keeps the constant storageoverhead

Secure Multi-Owner Data Sharing for Dynamic Groups in the Cloud

In the present era ,cloud computing provides us a efficient way to share data amoung cloud users with low maintenance.But in multi-owner group ,there is a serious problem with preserving data and identity privacy due to frequent change of membership Some trends are opening up the period of Cloud Computing, which is an Internet-based improvement and utilize of computer technology. Security must be in given due importance for the cloud data with utmost care to the data and confidence to the data owne In this project ,we are proposing a secure multi-owner sharing scheme,for dynamic groups in the cloud.We are using group signature and encryption techniques. One of the biggest concerns with cloud data storage is that of data integrity verification at untrusted servers. To preserve data privacy, a basic solution is to encrypt data files, and then upload the encrypted data into the cloud. To resolve this problem recently the best efficient method MONA presented for secured multi owner data sharing.In our project ,we have removed the problem that occurred in existing system.In existing system whenever there is a revocation of member form group.manager has to generate a new key and then distribute to other members,this was a very tedious work,so we use a new technique of group signature so that the revoked member is not able to upload or download files. Now there is no need for generating new key each time whenever there is a revocation of members. DOI: 10.17762/ijritcc2321-8169.150515