There are 3 main types of ID management systems:

Examples

Siloed IDs

Create new account for every service, new account for mail, new account for instagram, new account for spotify, etc.

Federated IDs

Google, when I use my google account to log into third party services

Self-Sovereign IDs

Digital wallet, that contains all your info, which is only owned by you (via blockchain)

Federations and Federated Identity

FIM (Federal Identity Management) → Identity and Entitlements made portable

Federated Identity → Linking a persons electronic identity and attributes across multiple FIMs

SSO (Single Sign-On) → Is a subset of FIM and uses Federated ID to authenticate you across multiple services

Issues without Federation:

• Data replication
• Obsolete data
• Many passwords
• No use for some accounts → Unneeded exposure
• Sometimes location based