Identity Systems are the technical and organisational frameworks that establish, manage, verify, and revoke digital identities for users, devices, and services. They encompass authentication mechanisms, credential issuance, public-key infrastructure, and decentralised identity models (self-sovereign identity, DIDs) that enable secure, interoperable identification across platforms and jurisdictions.
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Overview
Identity Systems provide the mechanisms by which digital actors — humans, organisations, devices, and services — prove who or what they are. Traditional federated identity relies on centralised identity providers (OAuth, SAML); decentralised models use cryptographic key pairs anchored on distributed ledgers (DIDs, verifiable credentials) to give users portable, self-sovereign identities not dependent on any single service. Public-key infrastructure underpins certificate-based authentication. In metaverse and spatial computing contexts, persistent cross-platform identity is essential: users need a consistent identity that carries reputation, assets, and access rights across virtual environments. Authentication mechanisms range from passwords and hardware tokens to biometric verification and zero-knowledge proofs that assert attributes without revealing raw data.