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Wednesday, May 07, 2008 1:06 AM

Claims propagation: Kirchhoff or maxflow?

In the last week or so Paul Madsen made at least a couple of posts with strong visual components: one that resumed my old 2005 post on a notation for message crypto, the other on Feynman diagrams . Nice! Paul, when I am in that mood I find especially
Posted by vibro | 2 Comments
Monday, March 31, 2008 6:23 PM

Voting for the Italian government election via mail

It's that time again. Few months ago the Italian government fell, and as a good citizen I am called to the right-duty of casting my vote for electing the new one. There's a little detail, though: while in the past that meant taking a short walk through
Posted by vibro | 1 Comments
Tuesday, March 11, 2008 4:28 PM

The Tao of Authentication (Part III - last)

(continues from Part I and Part II ) Finally we've lined up all the elements we need for understanding how we can get rid of the 1-2-3 tyranny, and deal with our business requirements directly instead of relying on an old model that forces us to perform
Posted by vibro | 5 Comments
Monday, March 10, 2008 1:48 AM

The Tao of Authentication (Part II)

(continues from Part I ) You can consider this post and the fine grained analysis we made in Part I as a down payment for grasping the implications we'll see in Part III, which I plan to post in few hours (almost done). I was planning to have just 2 parts,
Posted by vibro | 6 Comments
Wednesday, February 20, 2008 9:12 PM

The Tao of Authentication (Part I)

From time to time it's healthy to challenge the assumptions, and look at (allegedly) familiar things with new eyes. Few weeks ago I had to do just that with the idea of authentication : I wanted to shake a bit an audience of architects, and make them
Posted by vibro | 16 Comments
Tuesday, January 22, 2008 9:56 AM

Understanding Windows CardSpace on the front page of Channel9

[ edit: apologies if this shows in your aggregator twice. I am testing the AmazonConnect feed ] Last week Caleb and I have been surprised in my office by Charles "Carlo" Torre and his camera. The result is an impromptu interview about CardSpace , which
Posted by vibro | 0 Comments
Thursday, January 17, 2008 9:25 AM

Modeling Reality (II)

Ah, the beauty of models. A good model can capture the essence of a system, a phenomenon, anything: it allows you to easily manipulate things, make predictions, transport the knowledge you already have of a domain to a new one. It's just great, and as
Posted by vibro | 3 Comments
Monday, January 14, 2008 9:13 PM

The video "WS-Trust - Under the hood" is back online

It turns out that the channel9 video on ws-trust was down for (quite?) some time. I am pretty surprised by the number of people that is still checking out that clip! Now it works again, provided that you view it by clicking the download button (which,
Posted by vibro | 1 Comments
Monday, January 07, 2008 11:46 PM

I smuggled a neologism... or did I?

Back in October 2005, few weeks after I moved to the US, I wrote a blog post in which I introduced the idea of a collective name for the federated resources accessible to a company. One of the names I proposed was federnet . At the time I made a quick
Posted by vibro | 1 Comments
Tuesday, January 01, 2008 5:34 PM

Waiting for a physical copy...

...here there's the best approximation I found (short of a printout, of course, but that would be cheating:-) ). My wife just got a Sony ebook reader ; once we discovered it reads SD cards, we wanted to test it with a prerelease PDF of the book . Looks
Posted by vibro | 1 Comments
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Monday, December 31, 2007 8:05 PM

Year's end blabbering: Omnidirectional Identities

On the Paris-Seattle flight, coming back after 2 weeks spent stuffing myself with all sorts of food with the excuse "after all, you can't find this in USA" :) Before hurling myself back in the vortex of daily work, and celebrate the end of the year with
Posted by vibro | 7 Comments
Friday, December 21, 2007 9:57 AM

The Authorization Continuum

On a flight from Rome to Warsaw: apparently the droning noise of the plane (or what's left of it after this ) inspires me, and now I finally have the means of pulling out live writer from a pocket and start writing. This time I'd like to explore with
Posted by vibro | 3 Comments
Monday, October 29, 2007 10:45 AM

The Tao of Claims

[updated] In short: I describe why claims are important for every developer and architect (not just the security expert), and I provide some heuristics for helping everybody to reason about claim based systems. I don't think we did an exceptionally good
Posted by vibro | 10 Comments
Monday, June 11, 2007 12:51 AM

Credentials vs. Identity; Authentication vs.... what?

[ EDIT: added some sketch ] In short: I briefly discuss some differences between the password based authentication model and the token based one; then I propose that we lack a proper term for describing some of the transactions enabled by cardspace and
Posted by vibro | 7 Comments
Thursday, June 07, 2007 9:15 PM

Drug-Resistant Tuberculosis, Federation and Fresh Tokens

This morning I was reading Newsweek (before you get any ideas: I subscribed to BOTH Newsweek and Time) and the interesting account they made about the history of a person. Much is being written on the subject, just browse your favourite news website for
Posted by vibro | 1 Comments
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