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

From: Andy Ashworth < >
Date: Wed, 20 Apr 2016 11:48:11 -0400


If Integrity is interpreted as applying to a system's ability to perform in accordance with the designer's intent, rather than focusing on data integrity, then the security definition works.

In my mind I further characterise security as measures to thwart a deliberate attack, while dependability usually considers random effects that can affect a system's behaviour and as such the two concepts are complementary.

Andy Ashworth, P.Eng
System Safety Certifier
OLRT Constructors/Constructeurs
Confederation Line
1600 Carling Ave. Ottawa, Ontario
Suite 450, PO Box 20, K1Z 1G3

Office: 613.916.6706
Cell: 613.314.6404
Email: andy.ashworth_at_xxxxxx

-----Original Message-----
From: systemsafety
[mailto:systemsafety-bounces_at_xxxxxx Christopher Johnson
Sent: April-20-16 11:03 AM
To: RICQUE Bertrand (SAGEM DEFENSE SECURITE) <bertrand.ricque_at_xxxxxx Peter Bernard Ladkin <ladkin_at_xxxxxx systemsafety_at_xxxxxx Subject: Re: [SystemSafety] Does "reliable" mean "safe" and or "secure" or neither?

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_xxxxxx behalf of RICQUE Bertrand (SAGEM DEFENSE SECURITE) [bertrand.ricque_at_xxxxxx
Sent: 20 April 2016 15:23
To: Peter Bernard Ladkin; systemsafety_at_xxxxxx 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_xxxxxx

-----Original Message-----
From: systemsafety
[mailto:systemsafety-bounces_at_xxxxxx Peter Bernard Ladkin
Sent: Monday, April 18, 2016 8:21 PM
To: systemsafety_at_xxxxxx 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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