Code consisting of an encoding section, in which the vocabulary items (with their associated code groups) are arranged in alphabetical or other systematic order, and a decoding section, in which the code groups (with their associated meanings) are arranged in a separate alphabetical or numeric order. SOURCE: CNSSI-4009
What is two part code?
The term Two Part Code refers to a code or keying arrangement divided into two separate parts so no single part alone is sufficient to reconstruct or use the protected value. It gives election, security, legal, or technical readers a specific label for the concept rather than a broader everyday meaning.
How is two part code used in cryptography or COMSEC?
In practice, Two Part Code is applied to the technical or security purpose captured by its definition: a code or keying arrangement divided into two separate parts so no single part alone is sufficient to reconstruct or use the protected value. Organizations combine that function with documented procedures, authorized access, testing, monitoring, and controls appropriate to the system.
Why does two part code need security controls?
Understanding Two Part Code matters because the concept can affect security, reliability, auditability, or trusted operation. In this glossary context, it refers to a code or keying arrangement divided into two separate parts so no single part alone is sufficient to reconstruct or use the protected value.
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Code consisting of an encoding section, in which the vocabulary items (with their associated code groups) are arranged in alphabetical or other systematic order, and a decoding section, in which the code groups (with their associated meanings) are arranged in a separate alphabetical or numeric order. SOURCE: CNSSI-4009
Cite this term
Election Security Glossary. (2026). Two Part Code. In Election Security Glossary. Retrieved August 22, 2026, from https://electionsecurityglossary.com/glossary/two-part-code
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