Model and service for privacy in decentralized online social networks

Algorithm 1: Access control
Input: webId // requestor user’s WebID
1　begin
	// Location of DOSN-PRIV model in the POD
2	urLPOD = “...solidcommunity.net/dosn-priv.owl”
	// Load the DOSN-PRIV model and infer new knowledge in compliance with the policies declared in the model
3	model = loadModel (urlPOD, reasoner)
	// Execute an SPARQL query
4	queryResult = execute Query (model, WeblD)
	// Return data
5	return queryResults
6　end

Table 1. Comparison criteria.

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Table 1. Comparison criteria.

Criteria	Description
Domain	The technology used in the related work.
SWRL rules	Checks whether the related work uses SWRL rules for access control.
Ontology	Checks whether the related work uses ontology.
Privacy granularity	Indicates the granularity (high or privacy granularity low) of data access control applied in related work.

Table 2. Comparison related work.

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Table 2. Comparison related work.

Authors	Domain	SWRL rules	Ontology	Implementation	Privacy granularity
Jiang and Zhang (2019) [29]	DOSNs/Blockchain			√	High
Belchior et al. (2020) [30]	Blockchain			√	High
Rahman et al. (2020) [31]	DOSNs			√	High
Esteves et al. (2021) [27]	Solid		√	√	High
Abid and Daud (2021) [32]	OSN		√	√	High
Braun and Käfer (2022) [33]	Solid			√	High
Tama and Wicaksana (2023) [34]	DOSNs/Blockchain			√	High
DOSN-PRIV	Solid	√	√	√	High

Table 3. Privacy requirements.

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Table 3. Privacy requirements.

Requirement	Description
R1	Allow relationship-based access control.
R2	Allow fine-grained access control.
R3	Allow flexible access control.
R4	The user must be able to choose where to store their data and maintain complete control over them.
R5	The user must be able to choose where to store their data and maintain complete control over them.

Table 4. DOSN-PRIV model new terms.

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Table 4. DOSN-PRIV model new terms.

Type	Created terms
Class	dosn-priv:Permission, dosn-priv:Read, dosn-priv:Write, dosn-priv:Share, dosn-priv:Post, dosn-priv:Note, dosn-priv:Video, dosn-priv:Photo, dosn-priv:Access, dosn-priv:Public, dosn-priv:Private, dosn-priv:Controlled, and dosn-priv:Page
Object property	dosn-priv:permissionType, dosn-priv:permissionOn, dosn-priv: Has comment, dosn-priv: Access Type, dosn-priv:Holds, dosn-priv:Removes, and dosn-priv:Has Page
Data property	dosn-priv:Created Date Time, dosn-priv:NumComment, dosn-priv:Message, dosn-priv:url, and dosn-priv:Permission Read

Table 5. Factors and level.
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Table 5. Factors and level.
Factor Level
Number of policies 2, 4
Number of parameters 10, 20
Number of requests 25, 50, 75, 100

Table 6. Response time comparison with blockchain methods.

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Table 6. Response time comparison with blockchain methods.

Method	Functionality	Ten-attributes	Average response time (ms) (per attribute)
Jiang and Zhang (2019) [29]	Update a post	Number of users	335
Belchior et al. (2020) [30]	Request access	Number of credentials	339
Tama and Wicaksana (2023) [34]	Post content	Number of words	586
Proposed method	Request content	Privacy parameters	760

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George Pacheco Pinto, José Ronaldo Leles Jr., Cíntia da Costa Souza, Paulo R. de Souza, Frederico Araújo Durão, Cássio Prazeres. Model and service for privacy in decentralized online social networks[J]. Journal of Electronic Science and Technology, 2025, 23(1): 100302

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