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The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
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TBase - an Integrated Electronic Health Record and Research Database for Kidney Transplant Recipients
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A Challenge-Response Assisted Authorisation Scheme for Data Access in Permissioned Blockchains.

Xiaoshuai Zhang1, Chao Liu1, Kok Keong Chai1

  • 1School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK.

Sensors (Basel, Switzerland)
|August 23, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces Challenge-Response Assisted Access Authorisation (CRA3) for permissioned blockchains. CRA3 protects user credentials during data access authorization, even if network nodes are untrusted, by avoiding direct credential exposure.

Keywords:
access controldecentralised networkpermissioned blockchainprivacy enhancement

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Area of Science:

  • Computer Science
  • Cybersecurity
  • Distributed Systems

Background:

  • Permissioned blockchains facilitate secure data sharing among authorized users.
  • Current data authorization methods in permissioned blockchains risk user privacy if consensus nodes are compromised.
  • Exposing user credentials to untrusted nodes during authorization can lead to unauthorized data access and privacy breaches.

Purpose of the Study:

  • To propose a novel authorization scheme for permissioned blockchains that safeguards user credentials.
  • To address the vulnerability of user privacy when consensus nodes in blockchain networks become untrusted.
  • To reduce the computational load on the consensus network during the data authorization process.

Main Methods:

  • Introduction of the Challenge-Response Assisted Access Authorisation (CRA3) scheme.
  • Implementation of a challenge-response mechanism to verify data access requests without exposing user credentials.
  • Decentralized computation of authorization tasks between data requesters and providers.

Main Results:

  • CRA3 effectively protects user credentials from compromised or malicious consensus nodes.
  • The proposed scheme prevents privacy leakage by eliminating the need for nodes to access sensitive user information.
  • Significant reduction in the computational burden on the blockchain's consensus network for authorization.

Conclusions:

  • CRA3 offers a robust solution for secure and private data access authorization in permissioned blockchain networks.
  • The scheme enhances user privacy and data security by design, even in adversarial network conditions.
  • CRA3 improves the efficiency of permissioned blockchains by optimizing the authorization process.