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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