Hawk: The Blockchain Model of Cryptography and Privacy-Preserving Smart Contracts

Kosba, Ahmed E.; Miller, Andrew; Shi, Elaine; Wen, Zikai Alex; Papamanthou, Charalampos

doi:10.1109/sp.2016.55

Cited by 1,758 publications

(957 citation statements)

References 29 publications

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“…In particular, we believe their use here could possibly be adapted to replace verifiers in optimistic fair exchange protocols and other related work. This can largely be enabled by using zero knowledge proofs of knowledge in order to facilitate manipulation of private data (see, for example, Hawk [7]). …”

Section: Automated Verifiersmentioning

confidence: 99%

Externally Verifiable Oblivious RAM

Gancher

Groce

Ledger

2017

Proceedings on Privacy Enhancing Technologies

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Abstract:We present the idea of externally verifiable oblivious RAM (ORAM). Our goal is to allow a client and server carrying out an ORAM protocol to have disputes adjudicated by a third party, allowing for the enforcement of penalties against an unreliable or malicious server. We give a security definition that guarantees protection not only against a malicious server but also against a client making false accusations. We then give modifications of the Path ORAM [15] and Ring ORAM [9] protocols that meet this security definition. These protocols both have the same asymptotic runtimes as the semi-honest original versions and require the external verifier to be involved only when the client or server deviates from the protocol. Finally, we implement externally verified ORAM, along with an automated cryptocurrency contract to use as the external verifier.

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Section: Automated Verifiersmentioning

confidence: 99%

Externally Verifiable Oblivious RAM

Gancher

Groce

Ledger

2017

Proceedings on Privacy Enhancing Technologies

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“…In the aspect of using blockchain technology to solve practical problems and providing specific implementation details, Guy Zyskind [15] proposed a decentralized personal information management system in which bit-coins can be used to pass storage, query, and data analysis instructions through some agreement, ensuring that users own and control their own information, but the paper doesn't propose a specific case of application, neither does it provide any personal privacy theory on the issue. Ahmed Kosba [7] Using Blockchain to Protect Personal Privacy in the Scenario of Online Taxi-hailing 887 argue that the current blockchain trading environment lacks the privacy protection of transactions, and that money flows between virtual addresses are completely exposed to the blockchain environment, so they propose a decentralized intelligent contract system called Hawk to protect the privacy of transactions by avoiding the clear text storage form of financial transactions on the blockchain. But the method can only protect the privacy of transaction information, which lacks a broader field of real life application.…”

Section: Introductionmentioning

confidence: 99%

Using Blockchain to Protect Personal Privacy in the Scenario of Online Taxi-hailing

Ning

Zhong

Tian³

2017

INT J COMPUT COMMUN

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Personal privacy protection issues has gradually caused widespread concern in society which will lead to economic and reputation losses, hinder network and E-commerce innovation or some other consequences if not handled properly. In this paper, we make use of the de-centralization, permanent and audibility of the blockchain to propose a blockchain-based personal privacy protection mechanism, which uses Online taxi-hailing as the application scenario. We not only provide the details of the blockchain custom transaction domain used by the scene, but also expound the information exchanging and blockchain auditing between passengers, Online taxi-hailing platform and drivers in Online taxi-hailing scene, providing a case model for the blockchain solution to personal privacy protection and a technical mechanism solution for further study of personal privacy protection issues.

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“…Blockchain-based [1] identity management (IDM) [2] services can associate information without relying on specific centralized third-party authority because it is possible to record and distribute trusted identities [3]. The IDM services [4][5] using Ethereum platform [6] solve the problems of the isolated authentication environment and the centralized IDM security in the traditional IDM services.…”

Section: Introductionmentioning

confidence: 99%

Security and Energy analysis on revised Mutual Authentication protocol in WiMAX networks

Padmanabhan¹,

Mariappan²

2017

IJSTSD

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We propose a blockchain-based user identity management service that supports a robust recovery mechanism for user identity. The proposed user identity recovery mechanism can recover the identity of the user who has lost his/her personal ID through his/her explicit request and the confirming process with the help of friends designated by the user in advance. In addition, we present the Ethereum smart contracts for the proposed recovery mechanism in Ethereum applications.

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Hawk: The Blockchain Model of Cryptography and Privacy-Preserving Smart Contracts

Cited by 1,758 publications

References 29 publications

Externally Verifiable Oblivious RAM

Externally Verifiable Oblivious RAM

Using Blockchain to Protect Personal Privacy in the Scenario of Online Taxi-hailing

Security and Energy analysis on revised Mutual Authentication protocol in WiMAX networks

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