How to convert (ancient) key in "version 2" to more modern "version 4" format?

[Kristian Fiskerstrand]

On 05/23/2016 09:56 PM, Bjoern Kahl wrote:
>  I'd like to convert the existing secret key and the corresponding
>  public key, preferably without destroying the signatures, from
>  "version 2" to "version 4". 

This is not possible.

-- 
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Kristian Fiskerstrand
Blog: https://blog.sumptuouscapital.com
Twitter: @krifisk
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Public OpenPGP certificate at hkp://pool.sks-keyservers.net
fpr:94CB AFDD 3034 5109 5618 35AA 0B7F 8B60 E3ED FAE3
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Primum ego, tum ego, deinde ego
First I, then I, thereafter I.

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