Re: Reusing signed user ID or attribute

2014-01-19 Thread Daniele Ricci
Thank you Daniel, it actually sounds very right. Now that I think about it, storing this kind of data in the public key block isn't so good afterall. I will investigate over this and ask to the right ML next time. Thank you everyone for your help. On Sun, Jan 19, 2014 at 5:21 PM, Daniel Kahn Gillm

Re: Reusing signed user ID or attribute

2014-01-19 Thread Daniel Kahn Gillmor
On 01/19/2014 09:55 AM, Daniele Ricci wrote: > Ok, so I have to conclude it's implementation specific? > I'm using a custom user attribute to store something that can change > quite often (privacy lists for a chat user). What do you suggest? I don't know what a "privacy list for a chat user" is.

Re: Reusing signed user ID or attribute

2014-01-19 Thread Hauke Laging
Am So 19.01.2014, 15:55:51 schrieb Daniele Ricci: > Ok, so I have to conclude it's implementation specific? > I'm using a custom user attribute to store something that can change > quite often (privacy lists for a chat user). What do you suggest? My first thought is: Why should it make sense to pu

Re: Reusing signed user ID or attribute

2014-01-19 Thread Daniele Ricci
Ok, so I have to conclude it's implementation specific? I'm using a custom user attribute to store something that can change quite often (privacy lists for a chat user). What do you suggest? On Fri, Jan 17, 2014 at 1:28 PM, Hauke Laging wrote: > Am Fr 17.01.2014, 11:44:55 schrieb Daniele Ricci:

Re: Reusing signed user ID or attribute

2014-01-17 Thread Johannes Zarl
On Friday 17 January 2014 14:33:25 Daniel Kahn Gillmor wrote: > I think you're conflating revocation of the primary key with revocation > of a user ID. > > Revocation of a primary key is permanent and cannot be overridden. > Revocation of a user ID can be overridden as long as the primary key > (t

Re: Reusing signed user ID or attribute

2014-01-17 Thread Hauke Laging
Am Fr 17.01.2014, 20:03:15 schrieb Johannes Zarl: > If, however, the revocation is only a temporary act until a newer > self- signature supersedes it, it would be almost impossible to > effectively and permanently revoke a key. That's why we all use only the super-secure (haha) offline mainkeys.

Re: Reusing signed user ID or attribute

2014-01-17 Thread Daniel Kahn Gillmor
On 01/17/2014 02:03 PM, Johannes Zarl wrote: > If the revocation is a final act, as long as I can make sure that the > revocation certificate reaches my communication partners I can be sure that > nobody can compromise the key and "reenable" it and start impersonating me. > > If, however, the re

Re: Reusing signed user ID or attribute

2014-01-17 Thread Johannes Zarl
On Friday 17 January 2014 13:28:50 Hauke Laging wrote: > IIRC then GnuPG accepts a later self-signature (overriding the > revocation). IMHO that makes most sense. As long as the mainkey isn't > revoked or expired why shouldn't one "change one's mind"? Wouldn't that have huge implications for the s

Re: Reusing signed user ID or attribute

2014-01-17 Thread Hauke Laging
Am Fr 17.01.2014, 11:44:55 schrieb Daniele Ricci: > My question is the following: suppose I create a user ID or attribute. > I sign it with my key and that's ok. > One day I revoke that user ID or attribute and sign it again with a > certification revocation. > > A few years later, I want to rest

Reusing signed user ID or attribute

2014-01-17 Thread Daniele Ricci
Hello list, I'm manipulating PGP keys with Bouncy Castle, especially signatures of user IDs and user attributes. But my question is not about development, it's about signatures. My question is the following: suppose I create a user ID or attribute. I sign it with my key and that's ok. One day I re