PGP: is there such a thing as a "signature only key?"

[Dave Bird]

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In article <20011017230851.B2803@pull.privacy.nb.ca>, M Taylor
<mctylr@privacy.nb.ca> writes
>On Wed, Oct 17, 2001 at 10:30:57PM +0100, Dave Bird wrote:
>> 
>>  It has been claimed to me there is such a thing as a "signature
>>  only key", and that the PGP program will (automatically) refuse
>>  to encrypt to it.
>
>GPG 1.0.6
>
>$ gpg --gen-key
>Please select what kind of key you want:
>   (1) DSA and ElGamal (default)
>   (2) DSA (sign only)
>   (4) ElGamal (sign and encrypt)
>Your selection? 2
>...
>Note that this key cannot be used for encryption.  You may want to use
>the command "--edit-key" to generate a secondary key for this purpose.
>
>Enjoy.
>

 But my PGP 6.5.3 for Win32 does not do this.  Or, apparently,
 even refuse to encrypt to such keys.  

 Could somebody with the same software try to duplicate this?



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