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

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

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

-----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

The System Safety Mailing List
systemsafety_at_xxxxxx #
" Ce courriel et les documents qui lui sont joints peuvent contenir des informations confidentielles, être soumis aux règlementations relatives au contrôle des exportations ou ayant un caractère privé. S'ils ne vous sont pas destinés, nous vous signalons qu'il est strictement interdit de les divulguer, de les reproduire ou d'en utiliser de quelque manière que ce soit le contenu. Toute exportation ou réexportation non autorisée est interdite Si ce message vous a été transmis par erreur, merci d'en informer l'expéditeur et de supprimer immédiatement de votre système informatique ce courriel ainsi que tous les documents qui y sont attachés."

" This e-mail and any attached documents may contain confidential or proprietary information and may be subject to export control laws and regulations. If you are not the intended recipient, you are notified that any dissemination, copying of this e-mail and any attachments thereto or use of their contents by any means whatsoever is strictly prohibited. Unauthorized export or re-export is prohibited. If you have received this e-mail in error, please advise the sender immediately and delete this e-mail and all attached documents from your computer system." #

The System Safety Mailing List
systemsafety_at_xxxxxx Received on Mon Jun 01 2015 - 13:21:42 CEST

This archive was generated by hypermail 2.3.0 : Tue Jun 04 2019 - 21:17:07 CEST