Through which channels can SCI materials be transmitted?

• A. Only through approved secure channels (encrypted electronic channels, secure mail) with documented chain-of-custody.
• B. Any channel is acceptable.
• C. Through public email without encryption.
• D. Through ordinary mail.

Answer: (A)

Transmitting SCI materials must follow tightly controlled methods that preserve confidentiality, integrity, and accountability. Approved secure channels provide encryption for content in transit, protecting against interception and tampering, while secure mail offers a protected handling path with proper authentication and containment. A documented chain-of-custody creates a verifiable record of who handled the material, when, and how it moved, which is essential for auditability and to deter or detect any unauthorized access or loss.

Public email without encryption can be read if intercepted, ordinary mail can be lost or opened, and using any channel without a traceable, protected path does not meet the required safeguards for SCI.