What encryption does the government use?

I'm curious to know, what specific encryption methods does the government utilize to secure its data and communications? Are these encryption algorithms proprietary, or are they based on widely-accepted and open-source standards? Additionally, how does the government ensure that these encryption methods remain secure and up-to-date with the latest advancements in cryptography? It's important to understand the measures in place to protect sensitive information from unauthorized access, and I'm eager to learn more about the encryption practices employed by the government.