> I believe a public key can be associated with more than one PGP private key

I don't know PGP at all but for basic asymmetrical or public/private key 
encryption, the public and private keys are basically one to one with each 
other. You generate a pair, both halves at once. Although I guess it is not 
provable that no two public keys have the same private key, that situation is 
hopefully unlikely.

Charles

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of CM Poncelet
Sent: Friday, August 23, 2019 8:01 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: vendor distributes their private key

The vendor can revoke his private/public key, generate a new
private/public key pair and - hopefully this time - publish only the
public key.
 
BTW I believe a public key can be associated with more than one PGP
private key, although doing so would still not explain the vendor's
publishing a private key that could decrypt his public key encrypted
data - regardless of how many other private keys could do so too.
 
Just my ha'penny.
 
Chris Poncelet (retired sysprog)


On 22/08/2019 20:41, Paul Gilmartin wrote:
> On Thu, 22 Aug 2019 14:13:58 -0500, Joel M Ivey wrote:
>
>> Thanks all for the response.   I'm glad I wasn't missing something.   I will 
>> discuss further with the vendor, hoping they will recognize the risks.
>>
> How can the vendor recover from this without causing great
> disruption, even an indefinite time in the future, to existing
> customers who are rely on the improperly distributed private key?
>
> -- gil
>
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