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http://www.openoffice.org/issues/show_bug.cgi?id=60875





------- Additional comments from [EMAIL PROTECTED] Tue Nov 11 16:28:06 +0000 
2008 -------
My opinion, to filter out the signer certificates with Key Enchipherment Key 
Usage.

The separation of the encryption(EC), authentication(DS), and signing(NR)
function came from a security problem.

Please imagine it:

case 1: You have a certificate with DS, NR, EC.
You want to login on a webpage, and the server drops some random data to sign 
it.
You sign it, then the server check the signature, and logins you, when it is
correct. But if the server drops some patched data, not random, the server owner
will have a signed document, which is signed with a certificate, where the
allowed purposes includes non repudation (NR), so your "random data" was SIGNED
for them.

case 2: You have EC with NR bits.
You can have an application, which simply sign with your encription certificate,
of course, this is not a way, yo want, but you sign something, with a law
acceptable certificate.

case 3: You sing something with a EC certificate
You signed it, because you want to make it an official document. But when you
will use it, on the judge, you will found, oops, no really signeture on it. So
you lost on the judge.


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