Changing preferences

[Faramir]

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I have a question... and maybe I have seen the answer before, but I
can't remember it...

I have modified my preferences in gpg.conf, but my key was generated
before making those changes... when I use showpref command, the cypher
algorithms are shown in the right order according to gpg.conf, but the
digest order is not in the right order... how can I make my keys to show
 my preferred algos and how to check they are in the right order?

 Best Regards
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