Is it possible to sign a message with multiple digest algorithms?

[vedaal at nym.hush.com]

On 9/6/2014 at 6:46 PM, "Pete Stephenson" <pete at heypete.com> wrote:
>
>Hi all,
>
>Is it possible to sign a message (or certify a key) with multiple 
>digest
>algorithms?
>
>For example, one might wish to sign a message with both SHA256 and
>RIPEMD160.
>
>If so, how would one go about doing this?
>
>I would imagine that, if possible, the command would be similar to 
>"gpg
>--armor --digest-algo SHA256 RIPEMD160 --clearsign" but this fails.
>
>If it is possible, how does GPG handle multiple signatures? 

=====

It can be done if a separate signing subkey is used for each different digest.


vedaal