Non-Colliding Biometric Identities for Digital Entities: Geometry, Capacity, and Million-Scale Virtual Identity Provisioning

2026-05-18

AI Summary

This work proposes the Biometric Identity Provisioning (BIP) framework to address the need for high-fidelity, non-colliding virtual facial identities for digital entities such as AI agents. The core insight is to embed synthetic identities within unoccupied gaps of the real human face manifold rather than in orthogonal subspaces. To achieve this, the authors introduce a repulsive allocation algorithm grounded in hyperspherical geometry, a gap-aware generator termed GapGen, and a progressive curriculum training strategy. The approach successfully generates ten million virtual embeddings that exhibit no collisions with 360,000 real identities and synthesizes one million photorealistic images. These assets form the v-LFW dataset, enabling diverse evaluation tasks and demonstrating a scalable, unbounded supply of virtual biometric identities.

Abstract

Digital entities such as AI agents and humanoid robots increasingly operate alongside real humans, yet their identity infrastructure is based on credentials rather than embodied biometric identity. We introduce Biometric Identity Provisioning (BIP), a new problem and solution framework that addresses: given an enrollment gallery of real human identities, provision virtual identities that are non-colliding with every enrolled identity, maintain sufficient inter-class separability, and are realizable as high-fidelity face images. The key geometric insight is that real face identities occupy a low-dimensional subspace of the embedding hypersphere, leaving no residual subspace for virtual identities. Hence, virtual identities must instead be allocated as unclaimed gaps within the real face manifold itself. BIP is therefore a constrained packing problem: available gaps vastly exceed any foreseeable enrollment scale, and provisioned identities remain non-colliding even as new real identities are subsequently enrolled. Grounded in this geometry, our repulsion-based allocation is not bounded by any fixed provisioning count; we demonstrate 10M non-colliding virtual identity embeddings against a gallery of 360K real identities. Realizing these embeddings as face images requires a generator that operates outside the training distribution of real face images; we introduce GapGen, a gap-aware generator trained with a curriculum that progressively extends synthesis into non-colliding regions, validated at 1M photorealistic virtual face images. We further construct v-LFW, a virtual counterpart to LFW face dataset, with protocols for virtual face verification, cross-reality matching, real-vs-virtual detection, and unified recognition and detection.

Problem

• Biometric Identity Provisioning
• Non-Colliding Identities
• Virtual Identity
• Face Embedding
• Digital Entities

Innovation

• Biometric Identity Provisioning
• non-colliding virtual identities
• face manifold gaps
• GapGen
• v-LFW