KDCS: Achieving Efficient and Privacy-Preserving ($k,d$k,d)-Truss Community Search for Social Networks
Bibliographic record
Abstract
Community search is essential in social network analysis, with the ($k,d$)-truss model offering a robust framework to identify densely connected subgraphs that contain a query vertex and meet both$k$-truss and distance constraints. Despite the increasing reliance on cloud servers for processing large social network graph data, privacy concerns remain unaddressed. To fill this gap, we propose a novel privacy-preserving ($k,d$)-truss community search (KDCS) scheme based on weighted community graphs. Specifically, to enhance search efficiency, we introduce a$k$-truss-G (KTG) tree to index communities for efficient queries. Firstly, we develop a boundary vertex encoding mechanism for the social distance matrix. Then, we design a KTG tree construction algorithm and a ($k,d$)-truss community search algorithm based on the concept of segmentation and assembly. To ensure data security, we propose a secure community distance calculation (SCDC) algorithm, which utilizes mutually orthogonal matrices to preserve the privacy of the social distance matrix while accurately calculating the social distance. Furthermore, improved symmetric homomorphic encryption (iSHE) and matrix encryption are utilized to safeguard both dataset privacy and query privacy effectively. In addition, rigorous security analysis demonstrates that the proposed KDCS scheme is indeed privacy-preserving. Finally, extensive comparative experiments with real social network datasets show that KDCS exhibits outstanding performance at every stage, underscoring its practical significance.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.020 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.002 |
| Bibliometrics | 0.003 | 0.006 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.004 | 0.008 |
| Open science | 0.007 | 0.008 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.004 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".