How can I use 256-bit encryption?

256-bit encryption is a server configuration. This has nothing to do with the certificate itself, it is based on your server configuration. To learn this, you should seek information provided by your webhosting platform or operating system. They will inform you how to set this encryption strength up.

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I purchased a renewal certificate, but my website still displays the old certificate. What should I do? What if I can only use one certificate file? What is a private key used for? What is the difference between 128- and 256-bit security?