Re: [SystemSafety] [EC 61508 and cybersecurity

From: Peter Bernard Ladkin < >
Date: Mon, 01 Jun 2015 13:16:35 +0200


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 2015-06-01 13:06 , RICQUE Bertrand (SAGEM DEFENSE SECURITE) wrote:
> Safety is a roughly 2D problem ( probability x consequence), the two dimensions being usually
> stable along the unique system timescale.
>
> Security is a 3D problem with sub dimensions

The analysis of what the consequences are and how they happen is very similar for both safety and security. Something happens to your system that cause it to do what you do not want. That "something" can be happenstance, or it can be deliberate. But the consequences are determined exactly the same way by the system properties in both cases. For analytical purposes, for security incidents you turn some of the possible events into quasi-Booleans (turning happenstance into intention) and formally propagate through the Causal Fault Graph.

PBL Prof. Peter Bernard Ladkin, Faculty of Technology, University of Bielefeld, 33594 Bielefeld, Germany Je suis Charlie
Tel+msg +49 (0)521 880 7319 www.rvs.uni-bielefeld.de

-----BEGIN PGP SIGNATURE----- iQEcBAEBCAAGBQJVbD8TAAoJEIZIHiXiz9k+5loIAJBiN25aTEdJ+oJNzfVdak24 k9UdknrSC6adF2fkpKGx6qUgv9XnyPusgjVuLs/5POpbjP/fRtWifZgCOAnseoqB hM5PhJYnP1qU1XmFmLGa0nXWNE5ydZwhOkcie9AW91Yt6B5AWpo4VKX+3pd156Gy OPDW+4x6jiPd5/8aWjjfyUxpAUrVpEiiRtbP5078LSwioL8DfO+FioepZZ4/b6d1 WysBhE/L9Q/mmx/ccislS8ljt2t7rPTv2ID34qpTCzAd9WgPc52s/6RTHHevGCB6 WQ45MkqpII4jLkHIY5YECxMhn+11tFaN1fOkvOfdDrMsEPiU98A+W81Aah0X454= =2eCZ
-----END PGP SIGNATURE-----



The System Safety Mailing List
systemsafety_at_xxxxxx Received on Mon Jun 01 2015 - 13:16:41 CEST

This archive was generated by hypermail 2.3.0 : Wed Feb 20 2019 - 01:17:08 CET