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I want to encrypt a secondary drive that I have for my system, but I don't want to have to input a password everytime that I want to use it. Can the keyring save the encryption password so that when the drive is accessed, it will be unlocked when you are logged in?
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Yes. The general process is to create and register a key file for the encrypted drive and use /etc/crypttab to automatically decrypt it during boot.
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If your initrd uses systems you can also use the same passphrase as for your primary disk; systemd caches passphrases and can unlock multiple devices at once if they share the same passphrase.
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Is it important that the decryption happens "on login" rather than sometime during startup?
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