John at Mozilla-Enigmail
Nov 1, 2009, 3:22 PM
Post #2 of 2
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Re: Using single subkey for both signing and encryption?
[In reply to]
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gpg.mexon[at]spamgourmet.com wrote:
> Hi, I just have a basic question about subkeys. When I create an RSA
> subkey I only have the option to create one for signing or encryption,
> not both. Why is that? There's nothing different about the keys
> themselves, is there? Is there supposed to be some increased security
> to doing it this way?
Given that the underlying mathematics is the same for encryption and signing,
only in reverse, if an attacker can convince a key holder to sign an unformatted
encrypted message using the same key then she gets the original.
--
John P. Clizbe Inet:John (a) Mozilla-Enigmail.org
You can't spell fiasco without SCO. hkp://keyserver.gingerbear.net or
mailto:pgp-public-keys[at]gingerbear.net?subject=HELP
Q:"Just how do the residents of Haiku, Hawai'i hold conversations?"
A:"An odd melody / island voices on the winds / surplus of vowels"
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