In this video IOHK researcher Mario Larangeira, Tokyo Institute of Technology in Japan introduces Kaleidoscope & Royale, cryptographic protocols for securely playing poker, with the Kaleidoscope paper accepted to Financial Cryptography 2018. 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 universally composable protocol for securely playing general card games with financial rewards/penalties enforcement. We remark that Royale also yields the first universally composable poker protocol. Interestingly, such an instantiation of a poker game based on Royale performs better than most previous works without composability guarantees, which we highlight through a detailed concrete complexity analysis and benchmarks obtained from a prototype implementation. Royale: A Framework for Universally Composable CardGames with Financial Rewards and Penalties Enforcement: https://iohk.io/research/papers/#MPEKMMQP Kaleidoscope https://eprint.iacr.org/2017/899 âKaleidoscope, eprint, IACRâ, is the first cryptographic poker protocol to address these three issues. It is the first protocol to be proven secure according to a comprehensive security model that formally and clearly captures all the properties and guarantees commonly required from a poker protocol. Moreover, Kaleidoscope employs blockchain techniques to ensure that winners receive their rewards and that cheaters are financially penalized. Even though it is mathematically proven to achieve security while providing financial rewards and penalty enforcements, Kaleidoscope achieves very high efficiency in comparison to existing solutions (which have not been formally proven secure). Mario Larangeira is a computer engineer and cryptographer who attended the Aeronautical Institute of Technology in Brazil and holds Master and Ph.D. degrees from Tokyo Institute of Technology in Japan. His professional background embraces software development and testing experience in aircraft, banking and telecommunication industries either in Brazil and Japan. He also has research experience in Cryptography and has authored scientific articles on cryptographic models and proof of security in public-key cryptography. https://iohk.io/team/mario-larangeira/ -- See more at: https://iohk.io Get our latest news updates: https://iohk.io/blog/ Meet the team: https://iohk.io/team/ Learn about our projects: https://iohk.io/projects/cardano/ Read our papers: http://iohk.link/paper-ouroboros Visit our library: https://iohk.io/research/library/ In the press: https://iohk.io/press/ Work with us: https://iohk.io/careers/ See more on Cardano: https://iohk.io/projects/cardano/ -- The Cardano PortfolioThe Cardano HubThe source for all things Cardanohttps://www.cardanohub.org/en/home/ Cardano Blockchain Explorer An open source block explorer for the Cardano project https://cardanoexplorer.com Cardano Documentation Full technical documentation of the project https://cardanodocs.com Cardano Roadmap Development path of the Cardano project https://cardanoroadmap.com Why Cardano The philosophy behind the project https://whycardano.com Daedalus Platform Open source platform https://daedaluswallet.io The Cardano Foundation Supervisory and educational body for the Cardano Protocol https://cardanofoundation.org Cardano Foundation YouTube All the latest videos & tutorials https://www.youtube.com/channel/UCbQ9... Cardano Foundation Follow the Foundation https://twitter.com/CardanoStiftung Cardano Slack Join the conversation https://cardano.herokuapp.com Cardano reddit Join the conversation https://www.reddit.com/r/cardano/ IOHK Development partner https://iohk.io IOHK blog Read about the latest technology advancements https://iohk.io/blog/ â