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pd_cipher::encryptors::numerical

Numerical token encryption using Piecewise Linear Transformation. Numerical token encryption using Piecewise Linear Transformation (PLT).

This module implements order-preserving and scale-preserving transformations for numerical tokens, enabling ML models to work with encrypted numeric data.

Structs​

PiecewiseLinearTransformer​

Piecewise Linear Transformer for numerical obfuscation.

Provides a stateless, key-derived monotonic function that preserves strict order and approximate relative scale for numerical data.

Properties

  • Order Preservation: If x < y, then transform(x) < transform(y)
  • Scale Preservation: Slopes centered around 1.0 maintain relative differences
  • Deterministic: Same key and parameters always produce same transformation
  • Secure: Key-derived parameters prevent inverse computation
  • Special Values: Handles Infinity, -Infinity, and NaN deterministically
pub struct PiecewiseLinearTransformer