new GPG key

new GPG key

[Paolo Bonzini]

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My backpack was stolen in Dusseldorf airport. I have started changing
passwords, and will also revoke my current GPG key soon. If you have
signed my previous key, or if you have an account on kernel.org, please
contact me so that I can have my new key signed soon.

Advice to people that use GPG routinely... If you are not doing it yet,
do the following, in increasing order of importance:

0) do not forget that you need a way to create a revocation certificate
(of course I had no problem with this). Paper, isolated machine (my
choice), USB key, whatever, but do it.

1) never put any 2-factor authentication tokens (which includes
phones!) in your backpack. Luckily I had my token and passport on
myself. Everything would have been **extremely** more complicated if
I hadn't. It also makes two factor authentication much more effective,
since a laptop after all is one of the easiest things to steal.

2) in addition to the usual encryption subkey, create one for signing
and use that instead of the master key; 3) put the master key on a USB
key, and replace it with a stub. These two steps are very easy to do and
enough to avoid having to rebuild the whole trust chain. Unfortunately,
it was on my todo list for, ehm, next week.

4) No, putting the master key and revocation certificate on the same
USB key is not a good idea.

5) Get a smartcard or a Yubikey NEO and put the subkeys on it; replace
subkeys with stubs on your usual working machines, especially laptops. It
gives you two factor authentication for free, and can also be used for
SSH if you add a third subkey.

This tutorial covers most of the above steps:
http://blog.josefsson.org/2014/06/23/offline-gnupg-master-key-and-subkeys-on-yubikey-neo-smartcard/

Thanks for your understanding,

Paolo
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Re: new GPG key

[Heinz Diehl]

On 18.10.2014, Paolo Bonzini wrote: 

> 5) Get a smartcard or a Yubikey NEO and put the subkeys on it; replace
> subkeys with stubs on your usual working machines, especially laptops. It
> gives you two factor authentication for free, and can also be used for
> SSH if you add a third subkey.

AFAICS, a lot of the lkml people use the mutt MUA, which does not have
any password encryption natively. In this case, the smartcard
has another advantage: you can have your email password encrypted 
and use it without having to enter a long and complicated passphrase.
In case your laptop gets stolen while travelling, the password to your
email is protected.

Here's what I did:

1. Generate a password file and assign the password to a variable.

touch .my-pw
echo "set my_pw_imap = \"your-long-and-random-password\"" > .my-pw

2. Encrypt this file to your own public key and shred the unencrypted textfile
3. Source the password file into .muttrc and set the imap password
   variable by writing something like this into your .muttrc:

 source "gpg2 -dq $HOME/.my-pw.asc |"
 set imap_pass=$my_pw_imap

Now, if you start mutt and it connects to your IMAP server, you'll be
prompted for your smartcards PIN, and that's it. In case your
laptop gets stolen while you're travelling and you don't have access
to the net (because all the other things in your bag like your mobile 
also got stolen), it will spare you the situation where the thief 
already had logged into your email and changed your password when 
you finally managed to connect to the net again.

Sorry for being OT, but I have encountered such a situation before and
it got me into serious trouble, so I dared to share this with you.

Re: new GPG key

[Paolo Bonzini]

On 10/18/2014 05:42 PM, Heinz Diehl wrote:
> Sorry for being OT, but I have encountered such a situation before and
> it got me into serious trouble, so I dared to share this with you.

That's actually a pretty interesting tip!

Paolo