Re: [SystemSafety] [EC 61508 and cybersecurity

Date: Mon, 1 Jun 2015 13:21:09 +0200

For the consequences, yes.

For the analyse of the potential causes, you explode the possibilities with security compared to safety, and you open additional topics far from pure system functions.

Bertrand Ricque
Program Manager
Optronics and Defence Division
Sights Program
Mob : +33 6 87 47 84 64
Tel : +33 1 58 11 96 82

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Sent: Monday, June 01, 2015 1:17 PM
To: systemsafety_at_xxxxxx Subject: Re: [SystemSafety] [EC 61508 and cybersecurity

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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

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systemsafety_at_xxxxxx Received on Mon Jun 01 2015 - 13:21:42 CEST

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