Secure Survival Data Processing System for Privacy-Preserving Logrank Tests

The patent divides the calculation process into multiple stages where intermediate results are distributed among multiple computing devices. Each device holds only a portion of the data or intermediate results, preventing any single device from accessing complete survival time data. This segmentation maintains calculation simplicity while protecting privacy through distributed computation.

The patent introduces an intermediary mechanism where a third-party computing device facilitates the logrank test calculations. This intermediary handles the complex secure computation operations, allowing the original data holders to perform simple data submission while the intermediary performs the privacy-preserving calculations and returns only final results.

The patent performs preliminary sorting and grouping of survival time data before the actual logrank test calculations. By pre-organizing the data into time-based groups and identifying which specimens are still surviving at each time point, the system enables subsequent calculations of survival counts and death counts without needing to access or reveal the underlying concealed survival time data during the test execution.

The patent replaces direct mechanical access to survival time data with cryptographic and statistical methods. Instead of physically examining the data to count survivors or deaths, the system uses secure computation protocols, secret sharing, and statistical aggregation techniques to derive these counts from concealed data representations.