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19 pages, 370 KiB

Open AccessArticle

A Universally Composable Linkable Ring Signature Supporting Stealth Addresses

by Xingkai Wang, Chunping Zhu and Zhen Liu

Mathematics 2024, 12(3), 491; https://doi.org/10.3390/math12030491 - 3 Feb 2024

Cited by 4 | Viewed by 1705

The linkable ring signature supporting stealth addresses (SALRS) is a recently proposed cryptographic primitive, which is designed to comprehensively address the soundness and privacy requirements associated with concealing the identities of both the payer and payee in cryptocurrency transactions. However, concerns regarding the scalability of SALRS have been underexplored. This becomes notably pertinent in intricate blockchain systems where multiple cryptographic primitives operate concurrently. To bridge this gap, our work revisited and formalized the ideal functionality of SALRS within the universal composability (UC) model. This encapsulates all correctness, soundness, and privacy considerations. Moreover, we established that the newly proposed UC-security property for SALRS is equivalent to the concurrent satisfaction of signer-unlinkability, signer-non-slanderability, signer-anonymity, and master-public-key-unlinkability. These properties represent the four crucial game-based security aspects of SALRS. This result ensures the ongoing security of previously presented SALRS constructions within the UC framework. It also underscores their adaptability for seamless integration with other UC-secure primitives in complex blockchain systems. Full article

(This article belongs to the Special Issue New Advances in Cryptographic Theory and Application)

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23 pages, 247 KiB

Open AccessArticle

Supported Decision-Making for People with Cognitive Impairments: An Australian Perspective?

by Terry Carney

Laws 2015, 4(1), 37-59; https://doi.org/10.3390/laws4010037 - 23 Jan 2015

Cited by 14 | Viewed by 9062

Abstract

Honouring the requirement of the Convention on the Rights of Persons with Disabilities to introduce supported decision-making poses many challenges. Not least of those challenges is in writing laws and devising policies which facilitate access to formal and informal supports for large numbers of citizens requiring assistance with day-to-day issues such as dealing with welfare agencies, managing income security payments, or making health care decisions. Old measures such as representative payee schemes or “nominee” arrangements are not compatible with the CRPD. However, as comparatively routine social security or other government services become increasingly complex to navigate, and as self-managed or personalised budgets better recognise self-agency, any “off the shelf” measures become more difficult to craft and difficult to resource. This paper focuses on recent endeavours of the Australian Law Reform Commission and other local and overseas law reform and policy initiatives to tackle challenges posed both for ordinary citizens and those covered by special programs (such as Australia’s National Disability Insurance Scheme and “disability trusts” in Australia and Canada). Full article

(This article belongs to the Special Issue Competency and Capacity: Issues Affecting Health Law, Policy and Society)

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