I’ve been digging around in my archives and found something that has sort of been lost. There is the traditional security triad, of Confidentiality, Integrity, Aviability (CIA). Which has also been revised to the following, at least 8 years ago. I found this on Bruce Schneier’s blog anyhow.

Authentication (who are you)
Authorization (what are you allowed to do)
Availability (is the data accessible)
Authenticity (is the data intact)

Also was added Admissibility because it was deemed that “this model is no longer sufficient because it does not include asserting the trustworthiness of the endpoint device from which a (remote) user will authenticate and subsequently access data. Network admission and endpoint control are needed to determine that the device is free of malware (esp. key loggers) before you even accept a keystroke from a user”.

I have been thinking a little. This keeping to 5 ‘A’s makes understanding this not straightforward. If we were to look at these again… the first 2 are to do with the identifying party, the next 2 are to do with the data, and the final one is to do with the endpoint. The first 3 ‘A’s I feel comfortable with, the last 2 feel like a workaround to keep 5 ‘A’s… hey the marketing guys would be happy with this 😉

I’ve changed Authenticity to what it was originally in the CIA triad, Integrity, and the last one to Trust, as this is basically what it is all about, do you trust the endpoint device.

Authentication (who are you)
Authorization (what are you allowed to do)
Availability (is the data accessible)
Integrity (is the data intact)
Trust (is the endpoint trusted)

So that gives us AAAIT if we go from the identity to the endpoint, or TIAAA from the endpoint to the identity.. well marketing wouldn’t like this at all, but I like it and I think it’s easy to remember 😀

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