Enhancing Privacy and Improving Security in Scalable Blockchain

2021

Blockchain, a circulated record innovation, can possibly be conveyed in a wide scope of utilizations. Among these applications, decentralized payment frameworks (for example Bitcoin) have been perhaps the most developed blockchain applications with inescapable appropriation. While the early plans (for example Bitcoin) are regularly the cash of decision by cybercriminals, they just give pseudo-secrecy, as in anybody can de-anonymize Bitcoin exchanges by utilizing data in the blockchain. To reinforce the security insurance of decentralized payment frameworks, various arrangements, for example, Monero and Zerocash have been proposed. Notwithstanding, totally Decentralized Anonymous Payment (DAP) frameworks can be criminally misused, for instance in online coercion and illegal tax avoidance exercises. Perceiving the significance of guideline, we present a novel meaning of Decentralized Conditional Anonymous Payment (DCAP) and portray the comparing security necessities. To develop a soli...

IJCSIS Vol 17 No 2, 2019

Blockchain is an innovative application model that integrates consensus mechanisms, distributed data storage, point-to-point transmission, digital encryption technology and many other computer technologies. It has the characteristics of being decentralized, safe, reliable, open and transparent. In blockchain, digital encryption technology occupies the core position. The security of user information and transaction data is the necessary condition for the popularization of blockchain, and the development of cryptography technology promotes and restricts the further development of blockchain. This article describes the whole infrastructure of the blockchain with its different layers such as data, network, consensus, contract and finally application. Taking the bitcoin running process as an example, this paper analyzes the problems that the blockchain still has in the aspect of privacy protection, and introduces the existing solutions to these problems, including the mixed coin mechanism, 0 knowledge certificate, Ring signature and other technologies, expounds the outstanding problems and makes a prospect.

Bitcoin is the first digital currency to see widespread adoption. Although payments are conducted between pseudonyms, Bitcoin cannot offer strong privacy guarantees: payment transactions are recorded in a public decentralized ledger, from which much information can be deduced. Zerocoin (Miers et al., IEEE S&P 2013) tackles some of these privacy issues by unlinking transactions from the payment's origin. Yet it still reveals payment destinations and amounts, and is limited in functionality.

2021

Every day there are more threats in the violation of personal data, where privacy and security of information are the main challenge in this age of information and communication. Thus, Blockchain technology comes as a revolution due to its characteristics of immutability, trust, transparency, decentralization and distribution in the registers, turning it into a disruptive technology that breaks traditional paradigms about how we perceive the world. In its development and application, it raises many questions, mainly with the compatibility, with privacy and protection of personal data, which is why we will examine in a general way how this disruptive technology works, the intersection it has with the legal norms and the possible crossroads they must dialogue and resolve so that people are true owners of their identity and personal data.

2017 IEEE European Symposium on Security and Privacy Workshops (EuroS&PW), 2017

This paper contributes a systematic account of transaction anonymization techniques that do not require trust in a single entity and support the existing cryptographic currency Bitcoin. It surveys and compares four known techniques, proposes tailored metrics to identify the use of each technique (but not necessarily its users), and presents longitudinal measurements indicating adoption trends and teething troubles. There is a tradeoff between the choice of users' preferred protection mechanisms and the risk that pertaining transactions can be singled out, which hurts privacy due to smaller anonymity sets unless a critical mass adopts the mechanism.

International Journal of Computer Engineering in Research Trends, 2019

Bitcoin is a popular cryptocurrency that records all transactions in an allotted append-handiest public ledger referred to as a blockchain. The security of Bitcoin heavily relies on the motivation-suitable proof-of-work (PoW) founded dispensed consensus protocol, which is run with the aid of the community nodes known as miners. Because of its inception, blockchain technological know-how has proven promising application possibilities. The spectrum of blockchain functions stages from financial, healthcare, automobile, hazard administration, internet of matters (IoT) to public and social offerings. Several reports focal point on utilizing the blockchain information structure in various applications. These vulnerabilities result in the execution of different security threats to the ordinary functionality of Bitcoin. We then examine the feasibility and robustness of the brand new safety solutions. Moreover, we discuss the current anonymity concerns in Bitcoin and the privateness-related threats to Bitcoin customers together with the evaluation of the comprehensive privacy-keeping solutions.

IEEE Security & Privacy, 2018

Privacy, facilitated by a confluence of cryptography and decentralization, is one of the primary motivations for the adoption of cryptocurrencies like Bitcoin. Alas, Bitcoin's privacy promise has proven illusory and, despite growing interest in privacy-centric blockchains, most blockchain users remain susceptible to privacy attacks that exploit network-layer information and access patterns which leak as users interact with blockchains. Understanding if and how blockchain-based applications can provide strong privacy guarantees is a matter of increasing urgency. Many researchers advocate using anonymous communications networks, e.g., Tor, to ensure access privacy. We challenge this approach, showing the need for mechanisms through which non-anonymous users can (i) publish transactions that cannot be linked to their network addresses or to their other transactions, and (ii) fetch details of specific transactions without revealing which transactions they seek. We hope this article inspires blockchain researchers to think 'beyond Tor' and tackle these important access privacy problems head-on.

—Bitcoin has emerged as the most successful cryptographic currency in history. Within two years of its quiet launch in 2009, Bitcoin grew to comprise billions of dollars of economic value despite only cursory analysis of the system's design. Since then a growing literature has identified hidden-but-important properties of the system, discovered attacks, proposed promising alternatives, and singled out difficult future challenges. Meanwhile a large and vibrant open-source community has proposed and deployed numerous modifications and extensions. We provide the first systematic exposition Bitcoin and the many related cryptocurrencies or 'altcoins.' Drawing from a scattered body of knowledge, we identify three key components of Bitcoin's design that can be decoupled. This enables a more insightful analysis of Bitcoin's properties and future stability. We map the design space for numerous proposed modifications , providing comparative analyses for alternative consensus mechanisms, currency allocation mechanisms, computational puzzles, and key management tools. We survey anonymity issues in Bitcoin and provide an evaluation framework for analyzing a variety of privacy-enhancing proposals. Finally we provide new insights on what we term disintermediation protocols, which absolve the need for trusted intermediaries in an interesting set of applications. We identify three general disintermediation strategies and provide a detailed comparison.

2014 IEEE Symposium on Security and Privacy, 2014

Bitcoin is the first digital currency to see widespread adoption. While payments are conducted between pseudonyms, Bitcoin cannot offer strong privacy guarantees: payment transactions are recorded in a public decentralized ledger, from which much information can be deduced. Zerocoin (Miers et al., IEEE S&P 2013) tackles some of these privacy issues by unlinking transactions from the payment's origin. Yet, it still reveals payments' destinations and amounts, and is limited in functionality.

This article analyzes how users perceive the degree of anonymity provided by the Bitcoin network, to what extent they are concerned about anonymity when using Bitcoin, whether they are knowledgeable of and concerned about specific de-anonymization attacks, and if they are aware of and adopt privacy-preserving countermeasures. A user survey with 125 active Bitcoin users reveals that 70% associate a medium or high level of anonymity with the Bitcoin network and rate their concerns as either low or medium. But almost every fifth user has already considered abandoning Bitcoin because of being concerned about anonymity. Though one third are aware of the risk of de-anonymizing the Blockchain but are not concerned, another almost 50% indeed feel concerned. Our findings have implications for users and developers, suggesting that actions should be undertaken to increase privacy awareness and the level of anonymity provided by the Blockchain and the Bitcoin network.