alphasigmax at gmail.com
Mon Nov 7 14:25:02 CET 2005
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David Shaw wrote:
> On Sat, Nov 05, 2005 at 04:39:40PM +1030, Alphax wrote:
>>David Shaw wrote:
>>>On Fri, Nov 04, 2005 at 10:15:16PM +0300, Pawel Shajdo wrote:
>>>>Can somebody explain me what is "back signatures"?
>>>>Manual not very clear about this.
>>>It's a countermeasure against an attack against signing subkeys.
>>>Basically, the primary key signs all subkeys. With backsigs, the
>>>signing subkey also signs the primary key.
>>>Without this, an attacker can "steal" a signing subkey from someone
>>>else and try and pretend that a signature came from his own key. It's
>>>not a particularly good attack: the attacker can't issue signatures to
>>>prove his ownership.
>>Will this remove the possibility of moving subkeys from one primary key
>>to another / converting primary keys to subkeys (documented at
> No, it's unrelated to that. It's a countermeasure against a (somewhat
> weak) attack. It has nothing to do with various bit twiddling you can
> do to your own key.
So how /do/ they work (and how does one go about moving subkeys between
Alphax | /"\
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