I have a PGP master public / private key pair. I have created 3 subkeys for it. I want to add 3 more subkeys to this master key. Would doing so change my public and private keys?
Your quesiton is quite scarce in details, so I will assume that you are talking about PGP keys. And for change a definition such as if that would lead to a key with a different fingerprint.
If you add a new subkey to an existing PGP key:
- the fingerprint of your key stays the same (it is the master key)
- existing signatures on your key are not lost
- the public key is augmented with the new subkey (and the signature binding it), so people that already have your public key will need to reimport/refresh it in order to get the new subkey.
- similarly, in order to work with the new private subkey (eg. if you used it on several PCs), you will need the private part imported.