SC-33 Transmission Preparation Integrity is withdrawn. NIST incorporated it into SC-8, Transmission Confidentiality and Integrity. There is no separate text to satisfy.
NIST SP 800-53 binds US federal systems, and reaches contractors and cloud providers through contract terms such as FedRAMP. For everyone else it is a reference catalog.
What it means in practice
The original idea was that information should stay intact while it is being prepared for sending, not only while it is on the wire. Under Revision 5 you cover that through SC-8, which asks you to protect the confidentiality and integrity of transmitted information, including on internal networks and on servers that send data.
A useful test is to ask what a receiver can verify. If the answer is nothing, you have no integrity evidence. If the receiver can check a signature or hash that you published through a different path, you do. That is the practical difference between claiming integrity and showing it.
SC-8 also asks you to think about internal networks and not only the internet. Service to service calls inside your own cloud account count as transmission.
Evidence to collect
- TLS or equivalent configuration for services that send data.
- Message signing or checksum settings where you exchange files or events.
- Pipeline settings showing exports are generated by controlled jobs, not by hand.
Common gaps
Integrity is often assumed for batch exports and file drops. A CSV built on a laptop and emailed has no integrity story at all.
How to implement it
Move recurring exports into controlled jobs. Add a hash or signature the receiver can check. Then reference SC-8 when someone asks for SC-33.
Quick check
Where did SC-33 go?
Into SC-8, Transmission Confidentiality and Integrity, according to the NIST OSCAL catalog.
