Policy-Based Sanitizable Signatures

Samelin, Kai; Slamanig, Daniel

doi:10.1007/978-3-030-40186-3_23

Cited by 27 publications

(20 citation statements)

References 51 publications

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“…(ii) We present an improved policy-based sanitizable signature scheme, which is based on the scheme in [16]. In our scheme, the number of blocks of the signed data can be changed, and the set of inadmissible blocks does not need to be stored.…”

Section: Contributionsmentioning

confidence: 99%

“…Attribute-based encryption schemes can provide finegrained access control [25][26][27]. In order to provide finegrained access control, some attribute-based sanitizable signature schemes are proposed [16,[28][29][30]. e scheme in [28] did not give the specific construct of the attribute-based sanitizable signature.…”

Section: Related Workmentioning

confidence: 99%

“…In this paper, the blockchain protocol not only supports removing additional information of the block but also redacting UTXO in the transaction. In order to reduce the storage space, we try to adopt a policy-based sanitizable signature [16]. However, in this way, the number of blocks of the signed data cannot be changed, and the set of inadmissible blocks needs to be stored.…”

Section: Introductionmentioning

confidence: 99%

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Fine-Grained and Controllably Redactable Blockchain with Harmful Data Forced Removal

Hou

Hao

Yuan

et al. 2021

Security and Communication Networks

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Notoriously, immutability is one of the most striking properties of blockchains. As the data contained in blockchains may be compelled to redact for personal and legal reasons, immutability needs to be skillfully broken. In most existing redactable blockchains, fine-grained redaction and effective deletion of harmful data are mutually exclusive. To close the gap, we propose a fine-grained and controllably redactable blockchain with harmful data forced removal. In the scheme, the originator of the transaction has fine-grained control over who can perform the redaction and which portions of the transaction can be redacted. The redaction transaction is performed after collecting enough votes from miners. All users can provide the index of the block containing the harmful data to receive rewards, which are borne by the malicious user who initially posted the data. Miners can forcibly remove the harmful data based on the index. The malicious user will be blacklisted if the reward is not paid within a period of time, and any transaction about such user will not be performed later. In addition, the scheme supports the redaction of additional data and unexpended transaction output (UTXO) simultaneously. We demonstrate that the scheme is secure and feasible via formal security analysis and proof-of-concept implementation.

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Section: Contributionsmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fine-Grained and Controllably Redactable Blockchain with Harmful Data Forced Removal

Hou

Hao

Yuan

et al. 2021

Security and Communication Networks

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“…The derived indistinguishability and collision-resistance models are nearly the same as defined in [23]. Second, our proposed accountability model is derived from the sanitizer accountability model defined in [41]. Note that our proposed accountability model grants a judge oracle to attackers, which determines whether or not a modified transaction links to a responsible modifier.…”

Section: Security Modelmentioning

confidence: 99%

“…Recently, Samelin and Slamanig proposed a policy-based sanitizable signatures P3S [41]. The sanitizing in P3S is also based on policies, such that a sanitizer can sanitize if it holds a trapdoor associated with attributes satisfying the policy associated with a signature.…”

Section: Related Workmentioning

confidence: 99%

Policy-based Chameleon Hash for Blockchain Rewriting with Black-box Accountability

Tian

et al. 2020

Annual Computer Security Applications Conference

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Exploring the redaction mechanisms of mutable blockchains: A comprehensive survey

Zhang

Lei

et al. 2021

Int J of Intelligent Sys

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Blockchain technology has attracted tremendous interest from both industry and academia. It is typically used to record a public history of transactions (e.g., payment/smart contract data), but storing nonpayment/contract data in transactions has been common. The ability to store data unrelated to payment/contract such as illicit data on blockchain may be abused for malicious purposes. For example, one may use blockchain to store the data related to child pornography and copyright violations, which are publicly visible and immutable. Moreover, an immutable blockchain is not suitable for all blockchain‐based applications. So far, numerous redaction mechanisms for the mutable blockchain have been developed. In this paper, we aim at conducting a comprehensive survey that reviews and analyzes the state‐of‐the‐art redaction mechanisms. We start by giving a general presentation of blockchain and summarize the typical methods of inserting data in blockchain. Next, we discuss the challenges of designing the redaction mechanism and propose a list of evaluation criteria. Then, redaction mechanisms of the existing mutable blockchains are systemically reviewed and analyzed based on our evaluation criteria. The analyses include algorithmic overviews, performance limitations, and security vulnerabilities. Finally, the comparisons and analyses provide new insights into these mechanisms. This survey will provide developers and researchers a comprehensive view and facilitate the design of future mutable blockchains.

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Policy-Based Sanitizable Signatures

Cited by 27 publications

References 51 publications

Fine-Grained and Controllably Redactable Blockchain with Harmful Data Forced Removal

Fine-Grained and Controllably Redactable Blockchain with Harmful Data Forced Removal

Policy-based Chameleon Hash for Blockchain Rewriting with Black-box Accountability

Exploring the redaction mechanisms of mutable blockchains: A comprehensive survey

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