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Trusted third party

About: Trusted third party is a research topic. Over the lifetime, 2919 publications have been published within this topic receiving 60935 citations.


Papers
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Journal ArticleDOI
TL;DR: This paper considers the collaborative data publishing problem for anonymizing horizontally partitioned data at multiple data providers and introduces the notion of m-privacy, which guarantees that the anonymized data satisfies a given privacy constraint against any group of up to m colluding data providers.
Abstract: In this paper, we consider the collaborative data publishing problem for anonymizing horizontally partitioned data at multiple data providers. We consider a new type of "insider attack" by colluding data providers who may use their own data records (a subset of the overall data) to infer the data records contributed by other data providers. The paper addresses this new threat, and makes several contributions. First, we introduce the notion of m-privacy, which guarantees that the anonymized data satisfies a given privacy constraint against any group of up to m colluding data providers. Second, we present heuristic algorithms exploiting the monotonicity of privacy constraints for efficiently checking m-privacy given a group of records. Third, we present a data provider-aware anonymization algorithm with adaptive m-privacy checking strategies to ensure high utility and m-privacy of anonymized data with efficiency. Finally, we implement the m-privacy anonymization and verification algorithms with a trusted third party (TTP), and propose secure multiparty computation protocols for scenarios without TTP. All protocols are extensively analyzed and their security and efficiency are formally proved. Experiments on real-life datasets suggest that our approach achieves better or comparable utility and efficiency than existing and baseline algorithms while satisfying m-privacy.

68 citations

Book ChapterDOI
15 Sep 2008
TL;DR: A new privacy-preserving PBA approach that avoids a Trusted Third Party (TTP) and shows how ring signatures can be used to efficiently prove the knowledge of an element in a list without disclosing it is presented.
Abstract: The Trusted Computing Group (TCG) has proposed the binary attestation mechanism that enables a computing platform with a dedicated security chip, the Trusted Platform Module (TPM), to report its state to remote parties. The concept of property-based attestation (PBA) improves the binary attestation and compensates for some of its main deficiencies. In particular, PBA enhances user privacy by allowing the trusted platform to prove to a remote entity that it has certain properties without revealing its own configuration. The existing PBA solutions, however, require a Trusted Third Party (TTP) to provide a reliable link of configurations to properties, e.g., by means of certificates. We present a new privacy-preserving PBA approach that avoids such a TTP. We define a formal model, propose an efficient protocol based on the ideas of ring signatures, and prove its security. The cryptographic technique deployed in our protocol is of independent interest, as it shows how ring signatures can be used to efficiently prove the knowledge of an element in a list without disclosing it.

67 citations

Posted Content
TL;DR: In this article, a blockchain-based digital identity solution is proposed to achieve passport-level legally valid identity without depending upon a single trusted third party, which builds on a generic provable claim model for which attestations of truth from third parties need to be collected.
Abstract: Digital identity is unsolved: after many years of research there is still no trusted communication over the Internet. To provide identity within the context of mutual distrust, this paper presents a blockchain-based digital identity solution. Without depending upon a single trusted third party, the proposed solution achieves passport-level legally valid identity. This solution for making identities Self-Sovereign, builds on a generic provable claim model for which attestations of truth from third parties need to be collected. The claim model is then shown to be both blockchain structure and proof method agnostic. Four different implementations in support of these two claim model properties are shown to offer sub-second performance for claim creation and claim verification. Through the properties of Self-Sovereign Identity, legally valid status and acceptable performance, our solution is considered to be fit for adoption by the general public.

67 citations

Book ChapterDOI
04 Sep 2000
TL;DR: An e-commerce protocol that ensures true fair exchange, does not require manual dispute resolution in case of unfair behavior by any party, and allows the customer to verify that the product he is about to receive is the one he is paying for.
Abstract: In this paper we propose an e-commerce protocol with the following features: (1) ensures true fair exchange, (2) does not require manual dispute resolution in case of unfair behavior by any party, (3) does not require the active involvement of a trusted third party, (4) allows the customer to verify that the product he is about to receive is the one he is paying for, and (5) can be used for the fair exchange of any two digital items.

67 citations

Journal ArticleDOI
TL;DR: There is a need to protect digital documents from authorized users who try to redistribute it illegally.
Abstract: Nowadays, the use of digital content or digital media is increasing day by day. Therefore, there is a need to protect the digital document from both unauthorized users and authorized users. The digital document should be protected from authorized users who try to redistribute it illegally. Digital watermarking techniques along with cryptography are insufficient to ensure an adequate level of security of digital media. The security of the transferring digital data in the modern world is also a big challenge because there is a high risk of security breaches. In this article, a secure technique of image fusion using hybrid domains (spatial and frequency) for privacy preserving and copyright protection is proposed. The proposed method provides a secure technique for the digital content in cloud environment. Two cloud services are used to develop this work, which eliminates the role of a trusted third party (TTP). First is the design of an infrastructure as a service (IaaS) to store different images with encryption processes to speed up the image fusion process and save storage space. Second, a Platform as a Service (PaaS) is used to enable the digital content to improve computation power and to increase the bandwidth. The prime objective of the proposed scheme is to transfer the digital media between a service provider and customer in a secure way using a hybrid domain along with cloud storage. Imperceptibility and robustness measures are used to calculate the performance of the proposed approach.

67 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202240
2021125
2020201
2019179
2018177