ROYALE: A Framework for Universally Composable Card Games with Financial Rewards and Penalties Enforcement

While many tailor made card game protocols are known, the vast majority of those suffer from three main issues: lack of mechanisms for distributing financial rewards and punishing cheaters, lack of composability guarantees and little flexibility, focusing on the specific game of poker. Even though folklore holds that poker protocols can be used to play any card game, this conjecture remains unproven and, in fact, does not hold for a number of protocols (including recent results). We both tackle the problem of constructing protocols for general card games and initiate a treatment of such protocols in the Universal Composability (UC) framework, introducing an ideal functionality that captures general card games constructed from a set of core card operations. Based on this formalism, we introduce Royale, the first UC-secure general card games which supports financial rewards/penalties enforcement. We remark that Royale also yields the first UC-secure poker protocol. Interestingly, Royale performs better than most previous works (that do not have composability guarantees), which we highlight through a detailed concrete complexity analysis and benchmarks from a prototype implementation

Mental Card Gaming Protocols Supportive Of Gameplay Versatility, Robustness And Efficiency

Pennainan kad mental merupakan protokol kriptografi yang membolehkan pennainan yang ~ disahkan adil di kalangan parti-parti jauh yang penyangsi dan berpotensi menipu. Pennainan kad ini setidak-tidaknya patut menyokong-tanpa memperkenal~an parti ketiga yang dipercayai (TTP)--rahsia kad, pengesanan penipuan dan keselamatan bersyarat ke atas pakatan pemain. Tambahan kepada keperJuan asas ini, kami meninjau isu-isu pennainan kad mental yang berkaitan dengan fungsian permainan, keteguhan operasional dan kecekapan implementasi. Pengkajian kami diberangsang oleh potensi pennainan berasaskan komputer dan rangkaian yang melewati batas kemampuan kad fizikal, terutamanya pembongkaran maklumat terperinci kad (seperti warna, darjat, simbol atau kebangsawanan) sambil merahsiakan nilai keseluruhan kad tersebut. ~. Mental card games are cryptographic protocols which permit verifiably fair gameplay among a l< ~. priori distrustful and potentially untrustworthy remote parties and should minimally providewithout the introduction of a trusted third party (TTP)---for card confidentiality, fraud detection and conditional security against collusion. In addition to these basic requirements, we explore into gameplay functionality, operational robustness and implementation efficiency issues of mental card gaming. Our research is incited by the potential of computer-based and networkmediated gameplay beyond the capability of physical cards, particularly fine-grained information disclosure (such as colour, rank, symbol or courtliness) with preservation of card secrecy. On the other hand, being network connected renders the protocol susceptible to (accidental or intentional) disconnection attack, as well as other malicious behaviours

Instantaneous Decentralized Poker

We present efficient protocols for amortized secure multiparty computation with penalties and secure cash distribution, of which poker is a prime example. Our protocols have an initial phase where the parties interact with a cryptocurrency network, that then enables them to interact only among themselves over the course of playing many poker games in which money changes hands. The high efficiency of our protocols is achieved by harnessing the power of stateful contracts. Compared to the limited expressive power of Bitcoin scripts, stateful contracts enable richer forms of interaction between standard secure computation and a cryptocurrency. We formalize the stateful contract model and the security notions that our protocols accomplish, and provide proofs using the simulation paradigm. Moreover, we provide a reference implementation in Ethereum/Solidity for the stateful contracts that our protocols are based on. We also adopt our off-chain cash distribution protocols to the special case of stateful duplex micropayment channels, which are of independent interest. In comparison to Bitcoin based payment channels, our duplex channel implementation is more efficient and has additional features

Welcome to Clubland: Exploring sociomaterial dimensions of poker-machine gambling harms in community-clubs in New South Wales Australia

This thesis investigates poker-machine gambling and gambling harms in New South Wales Australia. In this research I examine the social, technological, institutional, political and environmental arrangements which constitute Electronic Gaming Machine (commonly known as “poker-machine”) gambling. Through exploring gambling practices, discourses and policies, the study illuminates how gambling arrangements contribute to the phenomena of problem gambling and gambling harms. Despite several inquiries into gambling being commissioned by governments in Australia, the voices of those with lived experience of poker-machine gambling harms are largely absent or go unheard in policy discussions and decision-making. Accordingly, in this collaborative inquiry, conducted in partnership with the Gambling Impact Society (NSW) a peer-led community organisation, the voices and perspectives of those with experience of gambling harms are foregrounded. The study considers the impacts of poker-machine gambling, on individuals, families and communities. NSW gambling harm minimisation policy and practices are considered from the perspective of a range of stakeholders including, gambling operators, researchers, counsellors and people affected by gambling harms

Edging your bets: advantage play, gambling, crime and victimisation

Consumerism, industrial development and regulatory liberalisation have underpinned the ascendance of gambling to a mainstream consumption practice. In particular, the online gambling environment has been marketed as a site of ‘safe risks’ where citizens can engage in a multitude of different forms of aleatory consumption. This paper offers a virtual ethnography of an online ‘advantage play’ subculture. It demonstrates how advantage players have reinterpreted the online gambling landscape as an environment saturated with crime and victimisation. In this virtual world, advantage play is no longer simply an instrumental act concerned with profit accumulation to finance consumer desires. Rather, it acts as an opportunity for individuals to engage in a unique form of edgework, whereby the threat to one’s well-being is tested through an ability to avoid crime and victimisation. This paper demonstrates how mediated environments may act as sites for edgeworking and how the potential for victimisation can be something that is actively engaged with

Quantum cryptography: key distribution and beyond

Uniquely among the sciences, quantum cryptography has driven both foundational research as well as practical real-life applications. We review the progress of quantum cryptography in the last decade, covering quantum key distribution and other applications.Comment: It's a review on quantum cryptography and it is not restricted to QK

Meat trays, marginalisation and the mechanisms of social capital creation: An ethnographic study of a licensed social club and its older users

Alongside informal networks of friends and family, formal social groupings such as voluntary associations are valued by older people as opportunities for engagement. In Australia, one such grouping is the licensed social (or ‘registered’) club. Approximately 20 per cent of all older Australians, and 80 per cent of older residents of the state of New South Wales, actively participate in such clubs. Despite this, older people’s registered club participation has received little scholarly attention. This ethnographic study of one particular registered club aimed to discover the nature, meaning and role of club participation for its older members. Social capital existing in club-based networks emerged as a further investigative focus, and its mechanisms and outcomes were examined. Participant observation and in-depth interviewing were the main data collection methods used. Data analysis procedures included thematic analysis (based loosely on grounded theory methodology), as well as the more contextsensitive narrative analysis and key-words-in-context analysis. The study found that club participation enabled older members to maintain valued social networks, self-reliance and a sense of autonomy. Social networks were characterised by social capital of the bonding type, being largely homogeneous with respect to age, gender, (working) class and cultural background. Strong cohesive bonds were characterised by intimacy and reciprocity, and possessed norms including equality and the norm of tolerance and inclusiveness. These helped to minimise conflict and build cohesiveness, while protecting older club-goers from increasing marginalisation within the club. Peer grouping within this mainstream setting may have shielded the older club-goers from stigma associated with participation in old-age specific groups. The nature and scale of registered club participation amongst older Australians points to their unique and important role. The findings of this research indicate that – for at least this group of older men and women - club use is a major contributor to maintaining social connectedness and a sense of self as self-reliant, autonomous and capable. In the context of an ageing population, Australia’s registered clubs feature in the mosaic of resources available to older people, and their communities, for the creation of social capital

Meat trays, marginalisation and the mechanisms of social capital creation: An ethnographic study of a licensed social club and its older users

Alongside informal networks of friends and family, formal social groupings such as voluntary associations are valued by older people as opportunities for engagement. In Australia, one such grouping is the licensed social (or ‘registered’) club. Approximately 20 per cent of all older Australians, and 80 per cent of older residents of the state of New South Wales, actively participate in such clubs. Despite this, older people’s registered club participation has received little scholarly attention. This ethnographic study of one particular registered club aimed to discover the nature, meaning and role of club participation for its older members. Social capital existing in club-based networks emerged as a further investigative focus, and its mechanisms and outcomes were examined. Participant observation and in-depth interviewing were the main data collection methods used. Data analysis procedures included thematic analysis (based loosely on grounded theory methodology), as well as the more contextsensitive narrative analysis and key-words-in-context analysis. The study found that club participation enabled older members to maintain valued social networks, self-reliance and a sense of autonomy. Social networks were characterised by social capital of the bonding type, being largely homogeneous with respect to age, gender, (working) class and cultural background. Strong cohesive bonds were characterised by intimacy and reciprocity, and possessed norms including equality and the norm of tolerance and inclusiveness. These helped to minimise conflict and build cohesiveness, while protecting older club-goers from increasing marginalisation within the club. Peer grouping within this mainstream setting may have shielded the older club-goers from stigma associated with participation in old-age specific groups. The nature and scale of registered club participation amongst older Australians points to their unique and important role. The findings of this research indicate that – for at least this group of older men and women - club use is a major contributor to maintaining social connectedness and a sense of self as self-reliant, autonomous and capable. In the context of an ageing population, Australia’s registered clubs feature in the mosaic of resources available to older people, and their communities, for the creation of social capital

A Novel k-out-of-n Oblivious Transfer Protocol from Bilinear Pairing

As traditional oblivious transfer protocols are treated as cryptographic primitives in most cases, they are usually executed without the consideration of possible attacks, e.g., impersonation, replaying, and man-in-the-middle attacks. Therefore, when these protocols are applied in certain applications, such as mental poker game playing and fairly contracts signing, some extra mechanisms must be combined to ensure its security. However, after the combination, we found that almost all of the resulting schemes are not efficient enough in communicational cost, which is a significant concern for all commercial transactions. Inspired by this observation, we propose a novel secure oblivious transfer protocol based on bilinear pairing which not only can provide mutual authentication to resist malicious attacks but also is efficient in communicational cost