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- W4313462068 abstract "Data minimization is a legal principle that mandates the limitation of personal data to a necessary minimum in order to protect the privacy of individuals. In this light, we address ourselves to decentralized collaborative filtering systems in which individual users interact with each other instead of institutional recommendation providers to obtain recommendations. Decentralized collaborative filtering systems, in which data is distributed over all users, bear a privacy benefit over traditional centralized systems in which data is kept at a single authoritative node. We propose the first formal definition of data minimization for use in distributed systems in order to combine the privacy benefits of data minimization and data distribution. On the basis of this definition, we propose a distributed data minimization scheme based on Distributed Gradient Descent (DGD) that solves the data minimization problem for decentralized collaborative filtering systems. Here, data minimization represents a collection minimization problem in which users aim to collect necessary minimum amounts of rating data from other users in the system. We find by means of simulation that the overall amount of data collected by all users can be reduced significantly (> 14.65%) without jeopardizing recommendation performance, when users coordinate data collection. We thus prove that users collect unnecessarily much data, when they do not coordinate data collection." @default.
- W4313462068 created "2023-01-06" @default.
- W4313462068 creator A5031031250 @default.
- W4313462068 creator A5043270200 @default.
- W4313462068 date "2023-01-04" @default.
- W4313462068 modified "2023-10-03" @default.
- W4313462068 title "Distributed Data Minimization for Decentralized Collaborative Filtering Systems" @default.
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- W4313462068 doi "https://doi.org/10.1145/3571306.3571400" @default.
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