Two-Step Constant Parity Progression Rules in Precision Keying Software
Engineering Overview: Technical analysis of odd-even parity checking algorithms in computerized master key generation software, eliminating ghost key interchange.
Technical & Engineering Specifications
| Standard | ALOA / BHMA Master Keying Standards |
|---|---|
| Algorithm | Two-Step Constant Parity Progression Matrix |
| Eliminates | Ghost Key Cross-Interchange |
| Progression Step | 2 Bitting Depths (1.00 mm Minimum Differ Step) |
Parity Progression Rules
In master key calculations, software utilizes Two-Step Constant Parity Progression to prevent unintentional cross-keying.
Parity Rule
- Even/Odd Progression: Cuts progress in 2-step increments (e.g. depths 2, 4, 6, 8 or 1, 3, 5, 7).
- Phantom Key Elimination: Because adjacent depths differ by at least 1.0 mm, manufacturing clearances cannot trigger unintended shear lines.
Frequently Asked Engineering & Selection Questions
Q1: How does this keying system optimize facility access?
Technical analysis of odd-even parity checking algorithms in computerized master key generation software, eliminating ghost key interchange.