Archive for June, 2005

The Semantics of Signing

Thursday, June 30th, 2005

When we apply a digital signature to a data structure, we only apply it to the data actually present in the structure. But most of that data is only meaningful in relation to external data tables, and used with certain applications, which can change without influencing the signature on the data structure. This is a […]

Medical data communication systems, next generation

Wednesday, June 29th, 2005

A discussion of how future medical information communication systems could be built for maximum security and openness. Multiple actors do want and need access to the architecture so they can freely select components to fit into the architecture. These components can be conversion engines and scripts, maintenance systems, encryption and signature systems, and communication links.

Authenticating transactions, not people

Tuesday, June 28th, 2005

Two-factor authentication using hardware tokens to log on to internet banking sites (among other things) is intended to make banking over the Internet more secure. It turns out that it isn’t as great as it seems to be on first blush. Bruce Schneier has talked about this problem several times. Why is this problem so […]

Proving membership online

Tuesday, June 28th, 2005

If you’re a member of some organization, or have some certification that entitles you to sign up for services somewhere, you need to be able to prove that you have that credential somehow. In real life, you’d carry a plastic card issued by a reliable organization and that you could flash in the face of […]

Microsoft’s logon model problem

Monday, June 27th, 2005

After using Windows in one version or another for many years, I got myself an Apple iBook just three months ago. I use that iBook for everything I can use it, that is, everything except developing applications, since my customers still are stuck with Windows. What has struck me with the iBook is that working […]

As if the world needs yet one more blog…

Monday, June 27th, 2005

So, here I am, enriching the world with another blog you can’t live without. I know you’ve all been waiting with bated breaths on my words of wisdom, that the internet has been standing still, hushed and quiet, to see what I have to say.