Results 71 to 80 of about 249,662 (220)

Infraestrutura de chaves públicas otimizadora [PDF]

, 2012
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Ciência da Computação, Florianópolis, 2010Este trabalho tem como objetivo propor e implementar um novo conceito de certificado: o ...
Vigil, Martín Augusto Gagliotti
core  

Water Governance Under International Pressure: Policy Narratives, Food Security, Scarcity, and the Politics of Survival in Iran

Environmental Policy and Governance, EarlyView.
ABSTRACT Water governance is increasingly influenced by a paradox at the nexus of environmental scarcity and food security. Escalating water scarcity crises coincide with geopolitical disruptions that have exposed the fragility of global food supply chains, prompting states to expand domestic food production at the expense of water conservation ...
Alireza Raisi
wiley   +1 more source

Ocean Governance and Marine Conservation: Institutional Work as a Lever for Ocean Sustainability

Environmental Policy and Governance, EarlyView.
ABSTRACT Ocean governance presents one of the most complex environmental policy challenges of our time, requiring coordinated action across multiple scales, sectors and stakeholder groups. This paper applies institutional work theory to systematically examine how actors create, maintain and disrupt the governance arrangements underpinning ocean ...
Kedar Uttam, Kristjan Jespersen, Paige Olmsted, Katryn Pasaribu   +3 more
wiley   +1 more source

Blockchain-Enabled Privacy-Preserving Access Control for EHRs Sharing With Optimized User and Attribute Revocation

IET Information Security
Electronic health records (EHRs) have become a crucial application in cloud computing environments, necessitating advanced privacy-preserving access control mechanisms. Ciphertext policy attribute-based encryption (CP-ABE) is a widely recognized solution
Khanadech Worapaluk, Somchart Fugkeaw
doaj   +1 more source

Synthetic Strategies for the Construction of Cyclobutane‐Fused Heterocycles

European Journal of Organic Chemistry, EarlyView.
Cyclobutane‐fused heterocycles are important motifs commonly present in bioactive compounds, recognized for their rigid 3D structures that confer unique properties. However, synthesizing these compounds remains challenging. This review discusses current methods for their synthesis, such as photochemical, metal‐catalyzed, and Lewis acid‐mediated [2 + 2]
Michela Vargiu, Mauro Uras, Angelo Frongia   +2 more
wiley   +1 more source

Non-monotonic Practical ABE with Direct Revocation, Blackbox Traceability, and a Large Attribute Universe [PDF]

, 2020
This work shows all necessary calculations to extend the ``Practical Attribute Based Encryption: Traitor Tracing, Revocation, and Large Universe\u27\u27 scheme of Liu and Wong with non-monotonic access structures. We ensure that the blackbox traceability
Dirk Thatmann
core   +1 more source

Selective N‐Functionalization of Pyrazoles

European Journal of Organic Chemistry, EarlyView.
This review traces the evolution of regioselective N‐functionalization strategies for pyrazoles, a key class of nitrogen heterocycles widely used in medicinal chemistry. Due to rapid tautomerism, N‐functionalization often lacks selectivity, leading to poor and unpredictable regioisomeric outcomes.
Lucas Popek, Matthias Schrader, Christopher J. Teskey   +2 more
wiley   +1 more source

ID-HABE: Incorporating ID-based Revocation, Delegation, and Authority Hierarchy into Attribute-Based Encryption

, 2017
Ciphertext-Policy Attribute-Based Encryption (CP-ABE) has been proposed to implement fine-grained access control. Data owners encrypt data with a certain access policy so that only data users whose attributes satisfy the access policy can decrypt the ...
Qiuxiang Dong, Dijiang Huang, Myong Kang, Jim Luo   +3 more
core   +1 more source

Synthesis of β‐ and γ‐Carbolinones Through a Fe(III)‐Mediated Radical 6‐Endo‐Trig Cyclization of Indole‐Based Ugi 4‐CR Adducts

European Journal of Organic Chemistry, EarlyView.
A practical strategy for synthesizing β‐ and γ‐carbolinones from indole‐based Ugi 4‐CR adducts through an intramolecular radical cyclization using Fe(III)–H species is presented. This approach enables the efficient synthesis of spiro‐carbolinones under mild reaction conditions and demonstrates the effectiveness of secondary radicals in both cyclization
María F. Olvera‐Granados, Luis A. Polindara‐García   +1 more
wiley   +1 more source

Towards Efficient, Secure, and Fine-Grained Access Control System in MSNs with Flexible Revocations

International Journal of Distributed Sensor Networks, 2015
With the pervasiveness of mobile communications, MSNs have become a promising networking paradigm for users to share contents with others through mobile devices. This convenience comes at the cost of some serious security and privacy issues. In this work,
Shi-Feng Sun, Chen Lyu, Dawu Gu, Yuanyuan Zhang, Yanli Ren   +4 more
doaj   +1 more source