Establish Identities and Manage Authentication

MIL1 requirements
a. Identities are provisioned, at least in an ad hoc manner, for personnel and other entities such as services and devices that require access to assets (note that this does not preclude shared identities)
b. Credentials (such as passwords, smartcards, certificates, and keys) are issued for personnel and other entities that require access to assets, at least in an ad hoc manner
c. Identities are deprovisioned, at least in an ad hoc manner, when no longer required

MIL2 requirements
d. Password strength and reuse restrictions are defined and enforced
e. Identity repositories are reviewed and updated periodically and according to defined triggers, such as system changes and changes to organizational structure
f. Identities are deprovisioned within organization-defined time thresholds when no longer required
g. The use of privileged credentials is limited to processes for which they are required
h. Stronger credentials, multifactor authentication, or single use credentials are required for higher risk access (such as privileged accounts, service accounts, shared accounts, and remote access)

MIL3 requirements
i. Multifactor authentication is required for all access, where feasible
j. Identities are disabled after a defined period of inactivity, where feasible