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1、CHAPTER11PhysicalProtectionForifamanwatchtoolong,itisoddshewillfallasleepe.—FrancisBaconThegreatestoffaults,Ishouldsay,istobeconsciousofnone.—ThomasCarlyle11.1IntroductionMostsecurityengineersnowadaysarelargelyconcernedwithelectronicsystems,butthereareseveralreasonswhyphysicalprotectioncannotbeentir
2、elyneglected.First,ifyoureadvisingonacompanysoverallriskman-agementstrategy,thenwallsandlocksareafactor.Second,asitseasiertoteachsomeonewithanelectricalengineering/computersciencebackgroundthebasicsofphysicalsecuritythantheotherwayround,interactionsbetweenphysicalandlogicalprotectionwillbeuptothesys
3、temspersontomanage.Third,youwilloftenbeaskedforyouropiniononyourclientsinstallationswhichwilloftenhavebeeninstalledbylocalcontractorswhoarewellknowntoyourclientbuthaverathernarrowhorizonsasfarassystemissuesareconcerned.Youllneedtobeabletogiveinformed,butdiplomatic,answers.Fourth,manysecuritymechanis
4、mscanbedefeatedifabadmanhasphys-icalaccesstothem,whetheratthefactory,orduringshipment,orbeforeinstallation.Fifth,manylockshaverecentlybeencompletelycompromisedbybumping,aneasycovert-entrytechnique;theirmanufacturers(eventhosesellinghigh-securitydevices)seemedtobeunawareofvulnerabilitiesthatenablethe
5、irproductstobequicklybypassed.Finally,yourclientshosting365366Chapter11■PhysicalProtectioncentreswillusuallybeitsmosthardenedfacilities,andwillbetheresponsibilityofthesystemsmanagerswhowillmostoftenseekyouradvice.Muchofphysicalsecurityisjustcommonsense,buttherearesomenon-obvioustwistsandtherehavebee
6、nsignificantrecentadvancesintechnology,notablyinlock-pickingandotherformsofcovertentry.Thereareideasfromcriminologyandarchitectureonhowyoucanreducetheincidenceofcrimearoundyourfacilities.Andperhapsmostimportantly,thereareburglaralarmswhichhaveanumberofinterestingsystemaspects.Forexample,inordertodefe
7、ataburglaralarmitissufficienttomakeitstopworking,orinmanycasestopersuadeitsoperatorsthatithasbecomeunreliable.Thisraisesthespectreofdenialofserviceattacks,whichareincreasinglyimportantyetoftendifficultt
