In this paper, we motivate the need for efficient multisignature schemes in delegated mobile services. With the schemes, delegates can be identified and delegated accesses can be controlled. First, we give a new digital signature scheme with message recovery. Based on the digital signature scheme, two digital multisignature schemes are proposed: the parallel multisignature scheme and the serial...

We obtained detailed quantitative and interview data from Aetna U.S. Healthcare and six physician organizations to examine changes between 1998 and 2000 in the scope of capitation contracting and delegation of responsibility for claims payment and medical management in New York and California. The physician organizations in New York included Benchmark (Continuum), Montefiore IPA, and Lenox Hill...

Decentralization in the health sector has been widely implemented since the 1970s as a reform mechanism with mixed results. This study describes Fiji's 2 attempts at decentralizing its health sector and examines the implications they have had for the functions of planning, financing, and delivery of health services. The first wave attempted a major restructure by devolving Fiji's health system....

In accordance with the current legislation of Ukraine, state provides funding and appropriate conditions for functioning courts activities judges, which a separate determination in State Budget Ukraine expenses maintenance not lower than level that ensures possibility full independent administration justice law. there is single system ensuring judiciary - courts, bodies judicial governance, oth...

In a distributed environment, specific rights may be required while a task is controlled and processed. A user should delegate enough rights to a task for processing. Tasks cannot work correctly if delegated rights are insufficient, or security threats may occur if delegated rights are excessive. Restricted delegation is the step that delegates proper rights to a task, and that enables finegrai...

A government agency wants an infrastructure-based public service to be provided. Our experimental study compares two di¤erent modes of provision. In a public-private partnership, the two tasks of building the infrastructure and operating it are delegated to one private contractor (a consortium), while under traditional procurement, these tasks are delegated to separate contractors. We …nd suppo...

In this article, we study the potential for digital, online information and electronic voting to improve shareholder surplus by facilitating a new governance structure, owner-governance, which shifts control of the takeover decision from the board to shareholders. We compare analytical models of owner-governance to the current practice of delegatedgovernance in the context of increasing availab...

Historically, water and sanitation service providers in lowincome countries have struggled to accommodate rapid urban expansion, and particularly to serve the poor in peri-urban areas. One way to approach these challenges is to develop alternative approaches to service delivery, incorporating innovative institutional and contractual arrangements, and involving partnerships between communities, ...

The authenticity of public keys in an asymmetric cryptosystem can be gained in two di erent ways: either it is veri ed explicitly after knowing the public key and its certi cate, e.g. X.509 certi cates, or it is veri ed implicitly during the use of the keys. The latter concept has been introduced by Girault 1991 as self-certi ed keys. In this paper we extend this concept: We show how to issue s...