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Implementation and evaluation of an efficient secure computation system using 'R' for healthcare statistics
Koji Chida1, Gembu Morohashi1, Hitoshi Fuji1
1Secure Platform Laboratories, NTT Corporation, Tokyo, Japan.
This study introduces a secure statistical analysis system for medical data. It enables computation on encrypted records, enhancing patient privacy and enabling secure analysis of sensitive health information.
Area of Science:
- Medical Informatics
- Cryptography
- Statistical Computing
Background:
- Secondary use of medical data is crucial but hindered by privacy concerns.
- De-identification of medical data, especially for rare diseases, presents security challenges.
- Rigorous security management is essential for protecting patient privacy in medical data analysis.
Purpose of the Study:
- To develop a secure system for statistical analysis of medical data.
- To enable computation on encrypted medical records without decryption.
- To address the privacy constraints in secondary data use.
Main Methods:
- Utilized secure computation techniques from cryptography.
- Implemented a system combining secret-sharing-based secure computation with original computation.
- Integrated the system with the statistical software 'R' for healthcare statistics.
Main Results:
- Successfully computed average and unbiased variance for ~50,000 records in over a second.
- Accurately performed computations involving conditional expressions (t-test, median) within minutes.
- Demonstrated the system's capability for secure statistical analysis on encrypted medical data.
Conclusions:
- The proposed system maintains high security as medical records remain encrypted during analysis.
- It overcomes the processing time limitations of traditional secure computation protocols.
- Offers a secure and interactive method for analyzing medical data using 'R'.
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