Privacy-Preserving, Efficient, and Accurate Dimensionality Reduction

This research introduces PP-DR, a privacy-preserving dimensionality reduction (a technique that reduces the number of features in a dataset to make it easier to analyze) scheme that uses homomorphic encryption (a type of encryption that allows computations on encrypted data without decrypting it first) to let multiple organizations securely share and analyze data together without revealing sensitive information. The new method is much faster and more accurate than previous approaches, achieving 30 to 200 times better computational efficiency and 70% less communication overhead.