Re: Re: cache-timeout not working with smartcard

2009-12-18 Thread Peter Lebbing
I would also like the features requested in this thread: having the card locked
again after a decryption/authentication and the possibility to easily unplug and
replug an ID-000 reader.

Werner Koch wrote:
 > If you are talking about malware on your box, nothing will help you.
> You don't have any control anymore on your box.  The only advantage
> you have is that the bot needs to wait until you enter the PIN the
> next time and then it can replay the PIN as needed.  Oh, you are using
> a pinpad reader - well in this case the malware just et you sign
> something it is interested in and not what you assume.

This is also about physical access. If I use the smart card and leave the
workstation for a moment (and forget to lock the card again), somebody can sit
down at my workstation and happily decrypt my gpg files and use ssh to log in to
other systems.

Sure, physical access can cause lots of trouble, but it takes more time and
effort than just typing "ssh interesting-host". I don't feel comfortable about 
it.

>> 2. Couldn't scdaemon be configured to also access the signature key on
>> the card every time, even if only the authentication or encryption key
>> is needed? 
> 
> Why would you want to do that?  See above.

I'm not really convinced about the security of this method anyway. Access
control should be at the card. However, how about powering down _and_up_ the
card after every auth/decrypt? Configurable, of course. That way, PIN entry can
start immediately when the next auth/decrypt turns up, without the delay of
powering up and initialising the card (actually, the delay has been moved to the
moment after the previous use).

Greetings,

Peter.

PS: I also use the internal CCID driver.

-- 
I use the GNU Privacy Guard (GnuPG) in combination with Enigmail.
You can send me encrypted mail if you want some privacy.
My key is available at http://wwwhome.cs.utwente.nl/~lebbing/pubkey.txt
(new, larger key created on Nov 12, 2009)

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same key pair for more than one e-mail address

2009-12-18 Thread M.B.Jr.
Suppose I'd like to "bind" the same key pair to more than one e-mail address.
Is it recommended? Any comments will be greatly appreciated.


Regards,




Marcio Barbado, Jr.

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Re: same key pair for more than one e-mail address

2009-12-18 Thread Olav Seyfarth
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Hi Marcio,

> Suppose I'd like to "bind" the same key pair to more than one e-mail address.
> Is it recommended? Any comments will be greatly appreciated.

it depends.

Using it for two private mail addresses that both are public is no problem.
You may add or revoke UIDs later on.

If you use an email address only your closest friends know, then adding a UID
for it to your public key would reveal it.

Also, keep in mind that if you use the same key for private and business,
depending of the legislation on your country, your employer might ask you to
hand out the private encryption key once you leave the company. It is wise
to avoid such situations by using separate keys for business and private use.

There are more cases like a low-trust key just to secure transport e.g. for
XMPP aka Jabber.

Olav
- -- 
The Enigmail Project - OpenPGP Email Security For Mozilla Applications
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Re: [gnupg-users] same key pair for more than one e-mail address

2009-12-18 Thread James P. Howard, II
On Fri, Dec 18, 2009 at 08:08:15PM -0200, M.B.Jr. wrote:

> Suppose I'd like to "bind" the same key pair to more than one e-mail address.
> Is it recommended? Any comments will be greatly appreciated.

I wrote a blog post on this question a couple months ago:

  http://bit.ly/4eTg6z

James

-- 
James P. Howard, II, MPA MBCS
j...@jameshoward.us


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