6 research outputs found
Design an active verification mechanism for certificates revocation in OCSP for internet authentication
No doubt that data security online is crucial. Therefore, great attention has been paid to that aspect by companies and organizations given its economic and social implications. Thus, online certificate status protocol (OCSP) is considered one of the most prominent protocol functioning in this field, which offers a prompt support for certificates online. In this research, a model designed based on field programable gate array (FPGA) using Merkel’s tree has been proposed to overcome the delay that might have occurred in sorting and authentication of certificates. Having adopted this model and with the assistance of Hash function algorithm, more than 50% of certificates have been processed in comparison with standard protocol. Moreover, certificates have been provided with substantial storage space with high throughput. Basically, Hash function algorithm has been designed to arrange and specify a site of verified or denied certificates within time of validity to protect servers from intrusion and clients from using applications with harmful contents
Octopus: A Secure and Anonymous DHT Lookup
Distributed Hash Table (DHT) lookup is a core technique in structured
peer-to-peer (P2P) networks. Its decentralized nature introduces security and
privacy vulnerabilities for applications built on top of them; we thus set out
to design a lookup mechanism achieving both security and anonymity, heretofore
an open problem. We present Octopus, a novel DHT lookup which provides strong
guarantees for both security and anonymity. Octopus uses attacker
identification mechanisms to discover and remove malicious nodes, severely
limiting an adversary's ability to carry out active attacks, and splits lookup
queries over separate anonymous paths and introduces dummy queries to achieve
high levels of anonymity. We analyze the security of Octopus by developing an
event-based simulator to show that the attacker discovery mechanisms can
rapidly identify malicious nodes with low error rate. We calculate the
anonymity of Octopus using probabilistic modeling and show that Octopus can
achieve near-optimal anonymity. We evaluate Octopus's efficiency on Planetlab
with 207 nodes and show that Octopus has reasonable lookup latency and
manageable communication overhead
Certificate revocation system implementation based on the Merkle Hash Tree
Public-key cryptography is widely used to provide Internet security services. The public-key infrastructure (PKI) is the infrastructure that supports the public-key cryptography, and the revocation of certificates implies one of its major costs. The goal of this article is to explain in detail a certificate revocation system based on the Merkle hash tree (MHT) called AD–MHT. AD–MHT uses the data structures proposed by Naor and Nissim in their authenticated dictionary (AD) [20]. This work describes the tools used and the details of the AD–MHT implementation. The authors also address important issues not addressed in the original AD proposal, such as responding to a request, revoking a certificate, deleting an expired certificate, the status checking protocol for communicating the AD–MHT repository with the users, verifying a response, system security, and, finally, performance evaluation.Peer Reviewe
Certificate revocation system implementation based on the Merkle Hash Tree
Public-key cryptography is widely used to provide Internet security services. The public-key infrastructure (PKI) is the infrastructure that supports the public-key cryptography, and the revocation of certificates implies one of its major costs. The goal of this article is to explain in detail a certificate revocation system based on the Merkle hash tree (MHT) called AD–MHT. AD–MHT uses the data structures proposed by Naor and Nissim in their authenticated dictionary (AD) [20]. This work describes the tools used and the details of the AD–MHT implementation. The authors also address important issues not addressed in the original AD proposal, such as responding to a request, revoking a certificate, deleting an expired certificate, the status checking protocol for communicating the AD–MHT repository with the users, verifying a response, system security, and, finally, performance evaluation.Peer Reviewe