[SystemSafety] Does "reliable" mean "safe" and or "secure" or neither?

[Christopher Johnson]

I dont think this is appropriate any more.

Security here seems to imply conventional IT systems - most of the breaches I work on
in safety related SCADA/ICS applications focus on the consequent loss of control which is not
characterised either by concerns over data integrity or confidentiality.
________________________________________
From: systemsafety [systemsafety-bounces at lists.techfak.uni-bielefeld.de] on behalf of RICQUE Bertrand (SAGEM DEFENSE SECURITE) [bertrand.ricque at sagem.com]
Sent: 20 April 2016 15:23
To: Peter Bernard Ladkin; systemsafety at lists.techfak.uni-bielefeld.de
Subject: Re: [SystemSafety] Does "reliable" mean "safe" and or "secure" or neither?

I would stick to the Laprie taxonomy :

Dependability =  Availability + Reliability + Safety + Integrity(not the SIL one, the true one) + Maintainability
Security = Integrity + Confidentiality

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

-----Original Message-----
From: systemsafety [mailto:systemsafety-bounces at lists.techfak.uni-bielefeld.de] On Behalf Of Peter Bernard Ladkin
Sent: Monday, April 18, 2016 8:21 PM
To: systemsafety at lists.techfak.uni-bielefeld.de
Subject: Re: [SystemSafety] Does "reliable" mean "safe" and or "secure" or neither?

On 2016-04-18 18:25 , Chris Hills wrote:
> What is the current thinking?   Does "reliable" also infer safe or secure?

The system consists of the following.

You, tied up in a chair, fixed to the floor. Along with your nemesis, with a rifle, who is pointing it at you, and is an excellent shot, and intends to shoot. Heshe pulls the trigger.

If the rifle is reliable, the system is unsafe.

If the rifle is completely unreliable, the system is safe.

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





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