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  A technique to reduce the risks of eavesdropping by obscuring the information that is transmitted. The EPCglobal Class- 1 Generation-2 and ISO/IEC 18000-6C standards use cover-coding to obscure certain transmissions from readers to tags. A more detailed description of how cover-coding is used in these two standards can be found in Section on cover-coding.
NIST SP 800-98