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Is it possible for myself to change the key size (say from 2048 to 4096) on an EXISTING PGP / GPG key, and just republishing that key?

Or do I have to generate a new key all together?

I want to say that you have to create a new key pair, but I don't have enough documentation either way to support a claim.

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Have a look at this answer I gave on SuperUser for a similar question. –  Jens Erat Jul 7 '13 at 19:12
    
That's what I figured, thank you for the write up. I copied it as-is and cited the answer and yourself down below. Please feel free to answer this question exactly the same and I'll mark your answer right (I can't mark mine for a few days) –  Urda Jul 8 '13 at 6:36
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If main parts of your answer aren't written by yourself, you should mark them as "Wiki Answer". –  Jens Erat Jul 8 '13 at 8:33
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Ah I see that option now! Thanks! –  Urda Jul 11 '13 at 20:54

1 Answer 1

up vote 3 down vote accepted

Thanks for the info Jens Erat


There is no way to "upgrade" an OpenPGP key. You will have to create a new one, and you will loose your reputation in the web of trust.

Think about:

  • Giving your new key with the old one, so other could follow the signatures
  • Revoking the old one after some time
  • Using a seemingly unnecessary large key as primary key and smaller subkeys for day-to-day usage. You will never need the primary key for anything but signing other keys (which is rare) and others verifying your signatures (cheap anyway).

Source

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