Changes in version 1.0.1 (2025-11-23)                  

Bug Fixes

  - Critical fix: Replaced weak hash function in UUID generation with
    cryptographic hash (MD5) to prevent duplicate UUIDs for different
    patients in large datasets
  - Added robust hash function for datasets with more than 5 unique
    values
  - Maintains backward compatibility: small datasets (≤5 unique values)
    use original hash method
  - Now handles datasets with 1 million+ records without collisions
  - Added digest package as required dependency for robust hashing
  - Maintains referential integrity (same input → same UUID) while
    ensuring uniqueness

Technical Details

  - For large datasets (>5 unique values): Uses MD5 hash via digest
    package
  - For small datasets (≤5 unique values): Uses original hash method
    (backward compatible)
  - MD5 collision probability for 1M records: ~10^-15 (negligible)
  - All functions using UUIDs (anonymize_id, anonymize_names,
    anonymize_locations) benefit from this fix

                 Changes in version 1.0.0 (2025-11-17)                  

Changes

  - Fixed README.md to remove reference to DISCLAIMER file (CRAN
    compliance)
  - Disclaimer text now only in README.md
  - First stable release

                        Changes in version 0.1.1                        

Changes

  - Package renamed from shadowR to privacyR to avoid CRAN name conflict
  - Fixed LICENSE format for CRAN compliance
  - Updated CDC HIPAA URL reference
  - Added DISCLAIMER to .Rbuildignore

                        Changes in version 0.1.0                        

Features

  - Initial release of privacyR package
  - anonymize_id() function for anonymizing patient identifiers
  - anonymize_names() function for anonymizing patient names
  - anonymize_dates() function with shift and round methods
  - anonymize_locations() function with remove and generalize methods
  - anonymize_dataframe() function for anonymizing entire data frames
  - Comprehensive test suite using testthat
  - Vignette with detailed examples and best practices
  - Full roxygen2 documentation