ProofBook: An Online Social Network Based on Proof-of-Work and Friend-Propagation

Biedermann, Sebastian; Karvelas, Nikolaos P.; Katzenbeisser, Stefan; Strufe, Thorsten; Andreas, Peter

doi:10.1007/978-3-319-04298-5_11

Cited by 4 publications

(15 citation statements)

References 16 publications

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“…After just one day, even the bottom 10% of users obtain data availability of above 99%. Hence, in contrast to related works (e.g., [9][10][11][12][13]), users are discriminated neither based on their own online time nor based on the quantity and quality of their social relations. Instead, SOUP offers a robust OSN.…”

Section: Robustnessmentioning

confidence: 99%

“…The third approach is to let nodes cooperate and provide temporarily available storage to each other [9][10][11][12][13]. SOUP is designed to follow this rationale as well.…”

Section: Related Workmentioning

confidence: 99%

“…Safebook [11], MyZone [12] and ProofBook [13] mirror each user's data at a subset of their direct friends. Unfortunately, a user thus depends on her social contacts for data storage, as she needs enough suitable friends that qualify as a mirror.…”

Section: Related Workmentioning

confidence: 99%

“…Recently, researchers have proposed a wide range of DOSN approaches, which considerably differ in how the central data repository is substituted and how the user controls her data [4][5][6][7][8][9][10][11][12][13]. However, each of these systems suffers from multiple shortcomings, including (i) limited success in providing high data availability [7,9,[11][12][13]; (ii) discrimination of users based on their dependency on other nodes [6,7,[11][12][13]; (iii) dependency on powerful nodes [4][5][6][7]; (iv) high overhead [10][11][12][13]; (v) low adaptivity to OSN dynamics [4,[6][7][8][9][10][11][12][13]; (vi) susceptibility to adversaries [4,6,7,[9][10][11][12][13]; (vii) a lack of data encryption [4,7,…”

Section: Introductionmentioning

confidence: 99%

“…However, each of these systems suffers from multiple shortcomings, including (i) limited success in providing high data availability [7,9,[11][12][13]; (ii) discrimination of users based on their dependency on other nodes [6,7,[11][12][13]; (iii) dependency on powerful nodes [4][5][6][7]; (iv) high overhead [10][11][12][13]; (v) low adaptivity to OSN dynamics [4,[6][7][8][9][10][11][12][13]; (vi) susceptibility to adversaries [4,6,7,[9][10][11][12][13]; (vii) a lack of data encryption [4,7,9]; (viii) non-consideration of mobile users [6,7,[9][10][11][12][13]; and (ix) technical feasibility and economical deployability issues [5,6,8,…”

Section: Introductionmentioning

confidence: 99%

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Soup

Koll

2014

Proceedings of the 15th International Middleware Conference on - Middleware '14

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Concomitant with the tremendous growth of online social networking (OSN) platforms are increasing concerns from users about their privacy and the protection of their data. As user data management is usually centralized, OSN providers nowadays have the unprecedented privilege to access every user's private data, which makes large-scale privacy leakage at a single site possible. One way to address this issue is to decentralize user data management and replicate user data at individual end-user machines across the OSN.However, such an approach must address new challenges. In particular, it must achieve high availability of the data of every user with minimal replication overhead and without assuming any permanent online storage. At the same time, it needs to provide mechanisms for encrypting user data, controlling access to the data, and synchronizing the replicas. Moreover, it has to scale with large social networks and be resilient and adaptive in handling both high churn of regular participants and attacks from malicious users.While recent works in this direction only show limited success, we introduce a new, decentralized OSN called the Self-Organized Universe of People (SOUP). SOUP employs a scalable, robust and secure mirror selection design and can effectively distribute and manage encrypted user data replicas throughout the OSN. An extensive evaluation by simulation and a real-world deployment shows that SOUP addresses all aforementioned challenges.

show abstract

Section: Robustnessmentioning

confidence: 99%

“…The third approach is to let nodes cooperate and provide temporarily available storage to each other [9][10][11][12][13]. SOUP is designed to follow this rationale as well.…”

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soup

Koll

2014

Proceedings of the 15th International Middleware Conference on - Middleware '14

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The Good Left Undone: Advances and Challenges in Decentralizing Online Social Networks

Koll

2017

Computer Communications

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Billions of users are now interconnected in Online Social Networks (OSNs) and, as they interact with each other, massive amounts of potentially private data are collected at the OSN providers' (e.g., Facebook or Twitter) premises. Unfortunately, provider-initiated privacy violations on this data are frequent and there is little chance that the providers will grant users effective dataprotection means. To address these issues and to help users regain the control over their data, decentralized OSNs (DOSNs) have lately been introduced as a competitive paradigm to provider-controlled, centralized OSNs. DOSNs are built to function without the participation of a provider and with the intent to prevent any misuse of private user data. However, all proposed DOSNs still lack widespread adoption. While challenging the market-leading OSNs is difficult for many reasons, in this paper, we set out to understand the technical deficiencies behind the absence of a successful DOSN. We focus on the major technical challenge of DOSNs: they need to substitute the datacenter-based infrastructure of centralized OSNs. We first review recent advances in decentralizing OSNs based on how they approach that challenge. In a next step, we analyze the advantages and disadvantages each approach yields, and then derive a series of challenges that a successful DOSN will have to fulfill. Finally, we discuss options of moving forward in designing a new DOSN that could be successful in doing so.

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Verifiable Smart Contract Portability

Westerkamp

2019

2019 IEEE International Conference on Blockchain and Cryptocurrency (ICBC)

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With the advent of blockchain technologies, the idea of decentralized applications has gained traction. Smart contracts permit the implementation of application logic to foster distributed systems that are capable of removing intermediaries. Hereby, lock in effects originating from isolated data storage and central authorities are mitigated. Yet, smart contracts deployed to a ledger generate dependencies on the underlying blockchain. Over time, requirements regarding contract execution may detach from the utilized chain due to contradicting incentives and security or performance issues. To avoid a novel form of lock in effect towards a host blockchain, we introduce a concept for smart contract portability that permits any user to migrate contract logic and state between blockchains in a flexible and verifiable manner. As the Ethereum Virtual Machine (EVM) is supported by a multitude of blockchain implementations, it poses a common execution environment for smart contracts. We provide a toolbox that facilitates smart contract portability between EVM-compatible blockchains without trust requirements in the entity executing the migration process. To prove the concept's soundness, we transfer token contracts based on the ERC20 standard as well as applications containing dependencies to other smart contracts. Our evaluation shows the validity of ported applications including their current states.

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ProofBook: An Online Social Network Based on Proof-of-Work and Friend-Propagation

Cited by 4 publications

References 16 publications

Soup

Soup

The Good Left Undone: Advances and Challenges in Decentralizing Online Social Networks

Verifiable Smart Contract Portability

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