1. Prevention of unauthorized disclosure of information.
Source: Election Terminology Glossary - Draft National Institute of Standards and Technology (NIST) https://pages.nist.gov/ElectionGlossary/
2. A set of rules that limits access to information.
Source: Cyber Threats to Elections – A Lexicon, Cyber Threat Intelligence Integration Center & Office of the Director of National Intelligence, https://www.dni.gov/files/CTIIC/documents/CTIIC_2018_Lexicon_without_banner_small_file_for_Post.pdf
3. A property that information is not disclosed to users, processes, or devices unless they have been authorized to access the information. Expanded definition: Preserving authorized restrictions on information access and disclosure, including means for protecting personal privacy and proprietary information.
Source: Explore Terms: A Glossary of Common Cybersecurity Terminology, National Initiative for Cybersecurity Careers and Studies (NICCS), https://niccs.us-cert.gov/about-niccs/glossary
4. The preservation of authorized restrictions on information access and disclosure, including means for protecting personal privacy and proprietary information.
Source: U.S. Cyberspace Solarium Commission, March 2020, https://subscriber.politicopro.com/f/?id=00000170-c638-d8f7-a7f1-f63b33510000