A COMSEC item used to transfer or store key in electronic form or to insert key into cryptographic equipment. Source: CNSSI No. 4006
What does EFD mean?
The term Electronic Fill Device (EFD) refers to a COMSEC device used to store or transfer cryptographic keys electronically or to load keying material into cryptographic equipment. It gives election, security, legal, or technical readers a specific label for the concept rather than a broader everyday meaning.
How is electronic fill device (EFD) used in cryptography or COMSEC?
In practice, Electronic Fill Device (EFD) is applied to the technical or security purpose captured by its definition: a COMSEC device used to store or transfer cryptographic keys electronically or to load keying material into cryptographic equipment. Organizations combine that function with documented procedures, authorized access, testing, monitoring, and controls appropriate to the system.
Why does electronic fill device (EFD) need security controls?
Understanding Electronic Fill Device (EFD) matters because the concept can affect security, reliability, auditability, or trusted operation. In this glossary context, it refers to a COMSEC device used to store or transfer cryptographic keys electronically or to load keying material into cryptographic equipment.
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A COMSEC item used to transfer or store key in electronic form or to insert key into cryptographic equipment. Source: CNSSI No. 4006
Cite this term
Election Security Glossary. (2026). Electronic Fill Device (efd). In Election Security Glossary. Retrieved August 22, 2026, from https://electionsecurityglossary.com/glossary/electronic-fill-device-efd
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