Putting NIST SP 800-171 in place: the order to work in, FIPS-validated encryption, sending CUI by email, and remote and hybrid work, with the Government's estimates of the effort involved.
A practical order for implementing NIST SP 800-171: find where CUI lives, set the boundary or enclave, write the SSP, fix the 5-point requirements first, set ODP values, and use NIST's change analysis to plan for Rev. 3, with the effort the Government estimates.
When CUI encryption must use FIPS 140 validated modules: what SP 800-171 Rev. 3 and CMMC say, the scoring penalty for unvalidated encryption, where validated cryptography is needed, ITAR's encryption rule, DHS email rules and cloud key management options.
What it takes to email CUI under NIST SP 800-171 and agency clauses: encryption in transit and at rest, FIPS-validated modules, whether your email provider must meet FedRAMP Moderate, GCC High's sharing limits, and an enforcement case over a third-party email host.
How NIST SP 800-171 applies when staff handle CUI from home: alternate work site requirements, remote access, split tunneling, multifactor authentication on mobile devices, VDI to keep endpoints out of scope, and scoring when remote access is not allowed.
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