Abstract
This disclosure describes a method for deriving cryptographic identity keys and Shamir Secret Sharing (SSSS) parameters deterministically from biometric birth and conception ephemeris data, eliminating central biometric storage.
Two distinct canonical ASCII strings serve as key derivation inputs:
SALT (birth anchor): `YYYYMMDDHHMM_LAT_LON_POLARITY_WEIGHT` Example: `198504171530_48.86_2.35_0_3.2`
PEPPER (conception anchor): `YYYYMMDDHHMM_LAT_LON_WEIGHT` Example: `198407110830_48.86_2.35_3.2`
If the exact conception timestamp is unknown, it is algorithmically deduced from the birth timestamp using a weight-modulated gestation formula: `gestation_days = 280.0 + (birth_weight_kg − 3.5) × 4.0`.
The SALT and PEPPER, combined with an email identifier, are fed into a Key Derivation Function to produce a 32-byte seed compatible with BIP-39 / secp256k1. The seed is split using Shamir's (2,3) threshold scheme, distributed across the user's device, a local service node, and a cooperative network node.
This approach allows full cryptographic key recovery on any device solely from immutable birth parameters, without biometric hardware (fingerprint readers, iris scanners) or centralized government ID databases.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
RENAULT, Frédéric, "Biometric Birth Ephemeris as Deterministic Parameters for Shamir Secret Sharing Key Recovery", Technical Disclosure Commons, (June 03, 2026)
https://www.tdcommons.org/dpubs_series/10328