Add/remove recipient without re-encrypting

2011-02-03 Thread Alphazo
Is it possible to add or remove a recipient to an already encrypted file and thus without re-encrypting the whole file? From what I understand GnuPG encrypts the payload (my binary file) with a symmetric session key. Then it stores each recipient key ID (optional) as well as an encrypted version

Re: Add/remove recipient without re-encrypting

2011-02-03 Thread Robert J. Hansen
On 2/3/11 9:38 AM, Alphazo wrote: Is it possible to add or remove a recipient to an already encrypted file and thus without re-encrypting the whole file? Technically, yes, although you would need to write the tool yourself. Assuming I own the private key of one the original recipient, could

Re: Add/remove recipient without re-encrypting

2011-02-03 Thread Hauke Laging
Am Donnerstag 03 Februar 2011 15:38:12 schrieb Alphazo: Is it possible to add or remove a recipient to an already encrypted file and thus without re-encrypting the whole file? Not an answer but a proposal: I have read this question several times on this list. I know that this is possible

Re: Add/remove recipient without re-encrypting

2011-02-03 Thread Nicolas Boullis
Hello, On Thu, Feb 03, 2011 at 03:38:12PM +0100, Alphazo wrote: Is it possible to add or remove a recipient to an already encrypted file and thus without re-encrypting the whole file? From what I understand GnuPG encrypts the payload (my binary file) with a symmetric session key. Then it