How to NOT Use IDEA?

Grant Olson kgo at
Tue Apr 13 23:28:26 CEST 2010

On 4/13/2010 4:06 PM, Bill House wrote:
> I created a new RSA/RSA 2048 key in my keyring.  So long as I only want
> to encrypt, it works fine.  When I want to encrypt AND sign, it
> complains that I need the IDEA algorithm.  When I specify the
> cipher-algo, it either claims the cipher is invalid, or it complains
> that it cannot use IDEA  -- which is it?  I have tried all the ciphers
> reported by using gpg --list-packets on the exported keyfile, to no
> avail.  Here is the example of my command line:
> gpg --armor --cipher-algo cast5 --sign --passphrase yadayada --user
> someHexID --recipient someHexID --output "output.asc" --encrypt "input.csv"
> I am running the Windows version of gpg 1.4.10b
> Where have I gone wrong?

Does this happen for any recipient?  Like if you encrypt to yourself, or
me?  Maybe that particular recipient has IDEA in his preferences.  You
can look at his (or your own) preferences by running 'gpg --edit-key
key_id' and then 'showpref'.  Do either of these have IDEA listed as a

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