to move, Enter to open, Esc to close. Try 3.5.3, AC.L2-3.1.1, MFA or unmarked.

Sensitive Security Information SSI

A CUI category in the Transportation grouping of NARA's registry, CUI Specified, marked CUI//SP-SSI.

NARA's description

CUI Registry · Sensitive Security Information

As defined in 49 C.F.R. Part 15.5, Sensitive Security Information is information obtained or developed in the conduct of security activities, including research and development, the disclosure of which DOT has determined would constitute an unwarranted invasion of privacy, reveal trade secrets or privileged or confidential information, or be detrimental to transportation safety. As defined in 49 C.F.R. Part 1520.5, Sensitive Security Information is information obtained or developed in the conduct of security activities, including research and development, the disclosure of which DHS/TSA has determined would, among other things, be detrimental to the security of transportation.

Verbatim from the registry entry, which NARA last reviewed on June 13, 2025. Fetched 2026-09-08.

Markings

Category marking
SSI
Banner marking
CUI//SP-SSI

A banner reads CUI for Basic categories and CUI//SP-SSI for Specified ones, followed by any limited dissemination control such as NOFORN. How the marking rule works, verbatim from 32 CFR 2002.20.

Authorities

The law, regulation or Government-wide policy that makes this information CUI, and whether it does so as a Basic or a Specified authority.

Safeguarding or dissemination authorityBasic or SpecifiedBannerSanctions
49 CFR 1520 (authorized by 49 USC 114(h))SpecifiedCUI//SP-SSI49 CFR 1520.17
49 CFR 15 (authorized by 49 USC 40119(b)(1))SpecifiedCUI//SP-SSI49 CFR 15.17

Source: https://www.archives.gov/cui/registry/category-detail/sensitive-security-info.