Which of the Following Is True of Transmitting Sensitive Compartmented Information (SCI)?
SCI may be transmitted or transported only through approved secure channels — encrypted, accredited systems and authorized, SCI-briefed couriers. It must never be sent over unclassified networks, personal email, or non-secure means, and it may only be handled within a SCIF by cleared, need-to-know personnel.
The answer
The true statement is that Sensitive Compartmented Information (SCI) may be transmitted or transported only through government-approved secure channels. That means accredited, encrypted communication systems (such as approved classified networks and secure telephones), or physical transport by a courier who is SCI-briefed and specifically authorized, using approved packaging. SCI can never travel over unclassified networks, commercial email, personal devices, fax, or any non-secure method, and it must be accessed only inside a Sensitive Compartmented Information Facility (SCIF) by people who hold the proper clearance and have a demonstrated need to know.
This is the answer the DoD Cyber Awareness Challenge rewards, because SCI is among the most tightly controlled categories of classified national-security information.
Why the secure-channel rule is correct
SCI is classified information concerning intelligence sources, methods, or analytical processes. A single unauthorized disclosure could expose collection capabilities and endanger lives, so its handling is governed by strict rules under DoD and Intelligence Community policy. Encryption and accredited systems ensure the data cannot be intercepted in transit; briefed couriers and approved packaging ensure physical copies stay under continuous positive control. Every link in the chain must be approved — the sender, the channel, the recipient, and the environment.
Why the other options are wrong
Typical distractors in this Cyber Awareness question include:
- "SCI can be sent over any classified network" — false; only systems accredited to that compartment and classification level may carry it, not every classified system.
- "SCI may be emailed if you mark it correctly" — false; correct marking never authorizes transmission over an unapproved or unclassified channel.
- "Anyone with a Secret clearance can receive SCI" — false; SCI requires a Top Secret clearance plus being read into (indoctrinated for) the specific compartment, along with need-to-know.
- "SCI can be discussed on a personal phone if you speak carefully" — false; it may only be discussed within a SCIF or over approved secure voice systems.
The bigger picture: handling, marking, and storage
Beyond transmission, SCI must be stored in a SCIF or approved GSA-rated security container, marked with the overall classification plus the relevant SCI control markings and dissemination controls, and destroyed using approved methods. Access always rests on three pillars: the proper clearance level, indoctrination into the specific compartment, and a valid need to know. Removing SCI from a SCIF, connecting personal media to classified systems, or leaving material unattended are all prohibited. Keeping the whole lifecycle — transmit, transport, store, mark, and destroy — inside approved secure channels is what protects the sources and methods the information represents.
| Transmitting SCI | Use accredited, encrypted classified systems approved for that compartment | Never use email on unclassified networks, personal devices, or fax |
| Transporting SCI | Use an SCI-briefed, authorized courier with approved packaging | Never mail it or carry it without authorization and cover |
| Discussing SCI | Only inside a SCIF or over approved secure voice systems | Never discuss on personal or open phone lines |
| Accessing SCI | TS clearance + compartment indoctrination + need to know | Never grant access on clearance level alone |
| Storing SCI | In a SCIF or approved GSA-rated container | Never leave unattended or take outside a SCIF |
Frequently asked
How must SCI be transmitted?
SCI must be transmitted only through government-approved, accredited, and encrypted channels rated for that compartment and classification level, or physically transported by an authorized, SCI-briefed courier using approved packaging. It may never be sent over unclassified networks, personal email, or other non-secure means.
Who can transport Sensitive Compartmented Information?
Only a courier who has been SCI-briefed (indoctrinated) for the relevant compartment, holds the required clearance, and is specifically authorized to carry the material may transport SCI, using approved packaging and maintaining continuous positive control the entire time.
What clearance is required to access SCI?
Access to SCI requires a Top Secret security clearance plus being formally read into (indoctrinated for) the specific compartment, along with a valid need to know. A clearance level alone is never enough; all three conditions must be met.
Can SCI be sent over a non-secure network?
No. SCI may never be transmitted over a non-secure or unclassified network, personal email, or personal device. Correct classification markings do not authorize such transmission. It must travel only through accredited, encrypted channels or approved courier.