Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
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Maintenance
The NIST website you are trying to reach is currently under maintenance. The maintenance window is expected to be over by 3:30pm EDT, on Sunday, October 22nd. Please check back after that time. We regret any inconvenience this causes you.
Created October 17, 2019, Updated October 19, 2023