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I just setup my Yubikey 4 on Windows. How can I use master password for signing/encrypting when I don't have my key?

If the yubikey is not inserted I get an error "Please insert the card with serial number : XXXXXXXXXXX"

closed as unclear what you're asking by Steffen Ullrich, Tobi Nary, iainpb, Rory Alsop Feb 26 '18 at 13:41

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    Isn't the main idea that you have the private key only on the smartcard (i.e. yubikey) so it is protected? So it makes no sense for me to expect it to be available without yubikey. – Steffen Ullrich Feb 15 '18 at 16:39
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The "master password" is not a replacement for your private key -- it is simply a security measure to prevent someone from reading your private key from disk (before being written to the disk, the private key is encrypted itself using your passphrase).

In other words, now that your key is on the Yubikey, you must always use the yubikey in order to sign or decrypt anything.

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