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Intrusion Detection For Your PC Case
Anonymous Coward writes "Ryan du Bois, from genbukan security (aka red0x), has created a chassis intrusion detection system for your computer box: the actual physical case. He also wrote a paper describing three separate implementations of this CIDS system: Contacts, Pressure switchs, and a PLA (programmable microchip). Included in his paper are complete designs for the first two and a promise for the last to come soon. Definitely worth a read. The paper is available in many formats including
OpenOffice 1.0,
HTML ,
TEXT
and a Tarball of them all. You can also obtain the
signatures as well as his Automated Security Tools Project, of which this is a member."
Dell Optiplexes could not be opened without tripping an internal warning that would flash on screen at reboot. You had to reset the bios based warning using a password to turn it off. Packard Bell and Compaq also did this years ago (I had a Compaq 286sx with an internal detection system which used a mercury switch)
Oh yeah, FIRST POST BIATCH.
I remember a plug for an intrusion detection system on my old 486's.
iRepairIT - iPhone, Mac, & PC Repair
Pretty much all standard business desktops have intrusion detection devices, as well as bios hooks to inform higher level software apps that it has been tripped. Most server cases have this as well- a whole slew of my compaq racks here have them, and they tie into our management system. Mind you, they lock as well, so I'm not as worried- they have solenoids! *THUNK*
I can't imagine someone cobbling together something that has existed forever is news...
EOM
Compaq has had something like this for years. Not only that, they have an internal case lock which can be activated/deactivated remotely, or in the password protected bios.
A special tool from compaq is required to defeat the lock...or a drill. But anyway, it can keep track of when the case is opened I believe.
I have seen, but never used the feature, so I don't know the specifics.
-Pete
Soccer Goal Plans
Why? This seems like a bit of overkill as compared to, eg, a lock.
People have been able to do similar things for years. Theres other companies out there right now (dell for instance) that have a warning that pops up saying that the case was removed. Theres also other cases you can buy that have the ability to do the same.
:)
If you wanted to it wouldn't be incredibly difficult to wire up a contact to the inside of your PC case. Using that dry contact you could either trigger an alarm (audible or visual) or just write out a timestamp to a log.
Just imagine... Someone cracks open your PC and a 175Db alarm sounds. Seems like a good idea to me!
Either this individual has too much time, or has been asleep for the past few years.
Since when has anyone actually needed a security system on their case?
http://www.forum-addicts.com
it;s already slashdoted
Who cares? Dell's have had this for years.
My Dell PC here at work has had that for 3 years.
Compaq, Dell, IBM...they all tell you when someone's opened the case, removed memory, added hard drives, etc etc....
C'mon!
All you need is tamper-evident tape.
Best Windows Freeware
I have moderation points, but it won't let me moderate the story itself as "pointless" or "redundant"
It's really too bad when the people running the site know less than the people reading it.
Twoflower
--
Twoflower
..because it gives us four different ways to slashdot them!
is that we need lasers set up in an inefficient pattern surrounding the box itself.
I am the lord of the pun. Dance Knave!
As interesting as this is, I'd be more worried about someone actually stealing the machine than opening it up for components. Even in a office environment, who is going to check each machine to make sure the employee using it didn't crack it open to swipe some RAM?
Why not just use a chain to the desk which locks the case shut? Then you're safe in both cases.
~slak
I used to work for a defense contractor where many of our computers were used to process classified information. Besides controlling access to the room in which the computers were located, stickers were placed over all the access points to the internals of the machine. The stickers were signed and dated by the security officer when they were placed and if one was broken, the computer had to be carefullly inspected before it would be returned to operation. Needless to say, employees were enouraged to report wear on stickers before they were completely broken, to avoid having to throughly inspect the innards of the device for bugs.
-- Adam
My bios has support for case intrusion but I've never tried to implement it. I'm using a MSI KT333 (ARU version) motherboard with AMI bios.
Planetes
"One World, One Web, One Program" - Microsoft Promo Ad
"Ein Volk, Ein Reich, Ein Fuhrer" - Adolf Hitl
a small Electromagnetic pulse would disable the whole setup.
And yes, it could likely be rigged not to damage the computer itself.
Howsabout a good old fashioned thieves knot?
I'm a little slow here, but what is to keep an intelligent intruder from resetting the software that tells you an intrusion took place?
I'd feel better will tamper-evident tape, but maybe I don't understand this system.
that i'll notice my house/business/server room broken into first.. Ok, let's assume that it doesn't matter at home... Let's say your business has legitimate security concerns for servers... The computer room should be secured with cameras, magnetic locks, security, etc.. is there a need to take this down to the individual computer level? If someone is sophisticated enough to break into the server room, they probably have the resources to get around the alarm on the case...
I've worked with a number of PC's that have chassis intrusion detection. Admittedly, it's a simple switch connected to a register that can only be reset in passworded BIOS.
This guy is writing like it's news or something. I read the brief file, and it looks like he just figured out what I first saw years ago.
And also, the classic phrase:
if you don't have physical security, you have no security at all.
Alcohol, Tobacco and Firearms should be the name of a store, not a government agency.
this seems kinda funny. First 'hacker' makes case mods so you can see al of his frilly internals. then he puts on a system so you cannot touch or have access to them. this is strangely reminiscent of the lingerie / chastity belt scenerio, see... no touch. see... no touch.
I want 2D games back.
What I would like to contruct some time (don't know how difficult it is tho) is a intrusion detection system that works on air pressure. after turning on the system air is pumped into the case (which is air-tight) randomly to increase the air pressure to a random value (should only be known to the hardware in the box and not readable by the computer or whatever). now, measure the pressure inside with a sensitive air pressure sensor. when the case is penetrated in any way the sensor would register the change in pressure and send the intrusion signal.
since the pressure inside is unknown it would be nearly impossible (depending on the sensitivity of the pressure sensor) to put the case in a pressured box with exactly the same pressure.
any reasons why this is an impossible or crazy thing to do ??
I guess you can't expect much better in news from an AC. Maybe posting news should be restricted to users that are logged in. Has anyone seen useful articles from an AC before? Just curious.
...before the *AA pushes to have all new PCs sold with some setup like this, so we can't screw around with the internals and get around their precious digital "rights" management hardware...
Facts do not cease to exist because they are ignored. - Aldous Huxley
Gracie, the gray tabby cat sleeps atop my PC case. If her bed is disturbed... and I do mean in any way... she cries for days on end. She can't be consoled. I have no choice but to hunt down the man what tried to jack my HDD and present his head to the cat like she does when she brings me mice.
The next Slashdot story will be ready soon, but subscribers can beat the rush and slashdot the links early!
Well, I could wrap a case in duct tape and *detect* an intrusion by checking if anyone had cut back the tape... or rig it with C4 and listen for loud exploding noises. But I would think that intrusion *prevention* or good chassis access control would be a more useful technology. Or case mod, as it were.
-ks
The angel in the oatmeal.
i use an indescrete piece of scotch tape, if the seal is broken, it's been tampered with!
--fetch daddy's blue fright wig, i must be handsome when i release my rage
IBM used to (and I imagine still does) build thier rs/6000 cases this way. The thing that always pleased me most was the use of a Medeco biaxial lock & key. Medeco's are effectively not pickable, in contrast to virtually all other pin-tumbler locks.
I don't know what other vendors use this or similar methods for the cases. the usual 3-4 pin lock incorporated in all the other cases I've seen (including some pretty expensive ones from Compaq / HP) were trivial to open. Even the use of mushroom pins is not going to be proof against a reasonably skilled intruder.
Linux is Linux, if One need clarify their dist: <Dist>/GNU Linux
bsds are of course just BSD
Dell computers and other computers have been doing this for some time in an attempt to disallow the 'ultimate' rootkit: a screwdriver and basic knowledge of PC Building.
Linux is dead.
LU
Leave a fake grenade, with the pin pulled and the spoon held down by the outside of the case in the computer.
Identify intrusion by the stain on the floor.
For bonus points, replace the fake grenade with a real one.
www.eFax.com are spammers
Dell or would that be phoenix has had this for a while. Basically its a small sensor over the chasis and cover. When set in the bios, it will detect if the cover was removed and tell you upon bootup. Some models even featured an audible alarm.
13 year old white supremacists are shitty web designers.
This is pretty old stuff.. Nice idea for retrofiting an clone case.. but still whats the big deal, pretty old news..
---- Booth was a patriot ----
Doesnt rreally work if you turn the power off before opening the case. Of course you may have another alarm for this, but it doesnt help you know whether the case was opened.
Take a single hair, wet it in your mouth, and place it across the crack between the removable side panel and the rest of the case. Anyone trying to break in will not see a single hair - or think anything of it if they do - and you'll know whether someone has cracked it open.
And it costs nothing.
My Karma was at 49, then they switched to words. All that work for nothing!
I like the system that Apple has put into their G4 Towers. There's a spring-loaded clip with a hole in it that pulls out of the back of the case. You can slip a cable/padlock/whatever through this which prevents the clip from springing back into the case.
When the clip is out, the EZ-flip-down-door on the side of the case is locked, preventing unnoticable intrusion.
The best option I saw was a fiber optic strand pulled through the case and the desk it was installed in. When the case was removed (or possibly tampered with) the fiber was broken. You could rig it with an alarm or a watch dog. Beware though, the cheap version using plastic optics rather than a good length of 62.5m MMF or 10m SMF. The plastic fiber gave many false positives. The ends wouldn't fit right so jiggling the case caused the LED light to be disrupted. If you're protecting nice Sparcs or SGIs, this is the answer for you. Don't skip on this though. You get what you pay for.
Two words ... BIG LOCK...
if its not removed they can't get the case open
...
its a lot cheaper and simplar then this system...
Cruise TT
So what we have here is some fourteen year old with his own "security" organization, a metric buttload of super glue and an utter lack of clue who writes a frankly useless article so that he can pretend he's important whilst slinging around big acronyms like "PLA" and "VHDL" when the tools they represent are useless to the task at hand. In other words, a snake-oil salesman.
-jhp, smacking down dim-bulbs everywhere
/. -- the Free Republic of technology.
mouse traps. And none of your rodent-friendly ones, neither. Attach metal prongy bit to a large voltage capacitor for good measure.
...a tinfoil hat for protection against Unseen Threats.
When the world was shook up by the news about security holes in laptops, I was happy I ran Apache.
Now that the world is shook up by the news of hackers breaking into PC towers and desktops, I'm happy I have a laptop.
Now let's hope my manufacturer fixes any holes in my laptop as quickly as the Apache people came up with their patch...
Please correct me if I got my facts wrong.
Mercury switch, blasting cap and a power source, big fucking deal! What a genius! Like most of you
Slashdot readers.
It's the 80's baby! Yeah!
I'm trying to figure out why this is news. I mean, find a contact switch and throw it on the connector. Why does this take 3 different formats of 'documentation' to say that?
I figured there would be something more interesting, like creating a whole subsystem that could figure out what more than just "case open". I figured there'd be something like using the serial port to talk to this system, and perhaps using the mb connection to let it know that there was an event to look into. HOW disappointing!
My Dell at the office has this, and everytime I open it I get that blasted error until I go into the BIOS and turn it off... I finally just disabled the damn thing. I also question the usefulness of this feature, I mean once someone has broken into your box isn't the damage done?
I'd like to quote a line from Jay and Silent Bob:
"Here's the pulse, and here's your finger, shoved way up your ass."
Nope, I'm going to sound like I'm so smart that nothing seems new to me. Ah, somebody wrote up a description of how to make your own detection system. Wait a minute, alarms using pressure switches have been done before!! Geez, can't they work spooky interaction into it or something?
Damn. This must be a slow news day if I can't be entertained by a a description of what is involved. No siree, I wouldn't want to learn anything. If Compaq and Dell can build stuff into their systems that sounds the same, then it isn't worth me knowing about. Hmm my computer doesn't have one of these. I guess I never thought about that when I built my own computer. Pity, I don't have an intrusion detection system.
Oh I know, I don't need one! My friends all shout 'First Post!'.
"Derp de derp."
seen it on dells for years
and more recently motherboards comming with jumpers/connectors for such intrustion dection switches on the case.
not really much news hear.
maybe if he did something cool with his like make it shock the hell out of who ever was attempting to access the case with out authorization.
OK, your case is comprimised. So what? What are they going to do, remove your hard drive while the power is on? Attach remote listening devices inside your case, so they can listen to your disks spinning?
If a thief breaks into your computer room they're going to hit the power switch. Then, if they don't carry away the entire computer, they'll open it up and remove what they want. AFTER the CIDS has been power disabled.
Is that guy a moron or what? Why the fuck would you use an FPGA / PLD for that? Just hook a few normally closed switches up in series. That's what happens when a moron takes a digital electronics class. Soon, some "genius" will think up of a way to make a microprocessor-controlled power switch for their goddamn case.
Wow, I never knew slashdot editors were THAT stupid.
For those overclockers that don't close their cases out of fear of overheating!
From the article: Write some VHDL code that will take a series of active low imputs and output a logic 0 if all is well and a logic 1 if the case is open. This is simple in concept, but may be hard in practice, especially to make is scalable. But given time, any electrical engineer with a chip programmer should be able to do this. Why bother with that? just use an OR gate! Here's one from fairchild semiconductor: http://www.fairchildsemi.com/pf/10/100201.html OR if you want to get fancy and avoid the problems he has with outside grounding to get around the security, simply run a pulse gen (good old 555 timer) through the contacts, and compare the output from the 555 with the output from the alarms. Now instead of grounding the leads to break in, you'll have to keep them connected somehow. And what about light? Why hasn't he included something that goes off if a light goes into the box? Just position a photosensitive resistor so that it can't "see" the light from the fan or wahtever otehr holes you have in your case, and if it changes value too much then someone is breaking into your case! What's more, such a resistor could look exactly like all the other resistors on the mother board, so you would never be able to isolate it. Also i would recommend adding either a light sensor or a pressure contact on the bottom (or both), which would go off when the machine was picked up for movement. By the way, notice that his "pressure sensors" are actually identical in function to the contact sensors. Real pressure sensors would notice things like someone pushing on the sides of the case. Finally to add some way of checking if someone is fooling around in the system - add something that registers the level of dust and writes it to some flash memory periodically - a low intensity diode shining towards a reciever will do. Just put it someplace where a lot of dust accumulates. If someone comes in, they will surely upset the dust that exists in every computer. If the level changes by too much, then have the alarm go off. Notice that I'm just an electrical engineer student right now, so there are most likely better ways of checking for intrusion, and some of mine may be too sensitive / subjective to be workable.
If you can't tell from all the other posts, this has been implemented for a great number of years on nearly all business-grade desktops, usually accompanied by a provision for a physical lock.
If this kid actually gets someone to buy into this and pay him to license his "software", I've gotta give him at least a little respect. At least he's not the one paying for it.
--Ribald
Don't worry about it if you have Windows XP.
1) If someone breaks in and doesn't change anything inside, you don't care.
2) If someone DOES break in and change anything in the hardware configuration, Windows XP will think it is no longer running on the same computer and stop working until you contact Microsoft for a new activation key.
I'm not going to care about case security until somebody comes up with a badass-looking bug-zapper inspired case mod.
"Geeks!" she exclaimed, "...all they ever think about is hex!"
pi = 3.141592653589793helpimtrappedinauniversefactory7
Hook these intrusion systems up to a noxious/poison gas canister in your server room, a la my car stereo. Now THAT''s security.
People keep abusing my profession, next time I tell them I'm a security expert they're going to ask me if I can please go and close the door...
free the mallocs!
I have never seen a microswitch. Perhaps one of you could send me a photo of one.
Actually, whenever I need a microswitch (home-made XYZ plotters, etc), I open up a case at work and pinch the 'CIDS' device. Very handy!
... that OpenOffice 1.0 has been used as a file format for widespread distribution in two recent stories (including this one). It may not be widespread among the wider herd, but it's easy to tell someone they can read the report with a *legal* free download.
;-)
Though I'd still prefer that LaTeX was the standard document distribution format, but then I'm a die-hard
"The purpose of argument is to change the nature of truth." -- Bene Gesserit Precept
If it's theft of components he's worried about, it just _might_ be easier for a thief to take the box.
WTF is the point of this? Where's the debate? Where's the cool factor? Many, many cases have intrusion detection switches built in already, and certainly the only place they would really be useful is in a large network, where an administrator would want to know if someone besides him has been cracking the cases. Perhaps Slashdot has implemented a randomizer to select submissions?
-R
Yes, but I wonder how tamper resistant they are--
We are talking about the case here-- an IDS is in a physically compromised environment-- how easy would it be for a knowledgable and determined attacker to reset, disable, or otherwise circumvent?
LedgerSMB: Open source Accounting/ERP
The term PLA itself is archaic at best, is there a worm hole for email somewhere ?
Nothing funnier than laughing at how "superior" everyone in this forum seems to be. Real intelligence should have a humbling effect. Instead, what we have is a whole lot of pretentious, pontificating jackasses who can't WAIT to prove someone wrong. Hell, most of the loudest complainers were probably secretly excited that they'd have an excuse to act superior.
(Posted as AC b/c I really don't feel like posting at -1, thank you very much)
So, beyond the dubious importance of this "design" - which begins with setting up copper contacts on the case and moving on to pressure switches - he can't give us any results because he doesn't have a utility to check the register.
That's classic.
Two bits says this made it to the front page because he mentions he's running linux on his "CIDS."
IP is just rude.
Is there any torture so subl
Intrusion detection for a PC case? If all you wanted to do was detect intruders, why not try tape? Just tape the box shut, and if the tape is missing, someone got in. You can also tape all the components so you can tell which ones were tampered with. You know, like the warranty seal from computer manufacturers. Why can't we keep it simple?
... even when there's no need for it.
He said himself, the event is registered when a pin is grounded. Is there a reason why one can't use SPST switches (wired in series or parallel, depending on the switch type) for this? Who is this wanker, and why should we care? Personally, I find it hard to take any "security consultant" seriously if he uses l33t speak in his username. Basically what we have is a 14 year old editor being impressed by a 14 year old with a soldering iron.
I'm really curious to find out what the criteria is for accepting and rejecting articles. Perhaps the Slashdot editors would do well to include why an article was rejected (ie: duplicate, boring, can't be verified, etc). I think many people would be interested to see that.
Then again, this will get modded down before anyone has a chance to read it, I'm sure.
There is no sig, there is only Zuul.
A Sticker that says protected by Smith and Wesson Securities. How dare ye dishonor my by touching my machina. Die you damned dirty ape!
"On a long enough timeline, the survival rate for everyone drops to zero."
Wait a minute. Couldn't you get the same effect with, say, a rubber band, or a piece of tape?
---
Remember the tooth!
Geez, I built a security system for my room with a relay, a buzzer, a battery and a couple of hunks of bare wire when I was 10 years old. I should write it up, maybe I can get on /.
A case with a lock on it? - You'll have to crack into it without a metal cutting saw.. and thats gonna be noisy and take some time. (Not to mention leave a mark.) Note also that most manufacturers sell cases with BIOS level intrusion detection built in if you want it.
I applaud the efforts of junior MacGyvers, but if you really want to be secure, there are obviously better solutions.
Speaking of computer security, that reminds me of the time when the CS department at the University I went to got a bunch of brand new lab machines. They all had intrusion detection, which we CS dept. admins thought was pretty cool. We told the campuswide IT guys that we needed them secured in place. They dragged their feet on it. A month later, the CS department threw a Lan party in the same building (though not in the same room) and some enterprising students used it to cover the theft of 4 of the new lab machines. Security wire and cameras were in the room within a week. As far as I know the stolen computers were never recovered. We took small solace in the knowledge that the computer beeps at them and displays a brief annoyance message now before booting the OS. That is, as long as they opened the case and didn't flash the BIOS.
// harborpirate
// Slashbots off the starboard bow!
Why are you prejudiced against people from Atlantic City?
Anyone seen any bond movie where he sticks a hair over the door to see if was later opened? I guess not. Dibs on patent!
If someone needs only your data, he doesn't have to steal anything. Just to have your hard drive for ten minutes in the hands would be enough. But such an intruder will be painted with the blast himsef, which marks him very clearly. So, even if nothing is going to be physically stolen, this is anyway a good way to protect your data.
I work at a large public university and I admin an unmonitored lab. This is what we came up with.
We used a home security alarm system modified to connect to the computers. We mounted a switch inside the case that would open when the case was opened. We put the correct resistor in series with the switch (home security alarms don't just measure continuity, the also measure resistance) and connected it to a RJ45 jack on a blank slot cover. We mounted a plate to the monitors either by replacing a screw with a security screw kit (you can't remove the screw without removing the cable run through it) or using industrial super glue. Loop the security alarm cable through the monitor plate and the lock hole on the back of most computers, connect it the RJ45 jack and arm the alarm. If someone disconnects the cable or opens the case, a 125db alarm sounds in the room and an automatic call is placed to the campus police.
I have great faith in fools - self confidence my friends call it. - Edgar Allan Poe
I think the whole point of posting a story is not actually providing news but inpiring discussion. And this story seem to have pretty scceded.
i have an case intusion detection, a piece of scotch tape. EAsy to install, cheap and vastly abundant, 'specially 'roud x-mas time.
how in the fuck did this get posted? not only is this old news but it is basic. this is standard on HP Vectras and lots of other average PC's. when was the last time a slashdot editor ordered a new PC?!
bloody typical. an academic recycles an old idea and passes it off as a new innovation. a clueless slashdot editor buys into this crap and thinks it's news.
LAME!
The company I work for makes seals mostly used in the tractor trailer business for securing trailer doors similar to hotel bar fridge seals. They are numbered and are a use once and throw away item. I find they work really good at securing PC cases.
>2) If someone DOES break in and change anything
>in the hardware configuration, Windows XP will
>think it is no longer running on the same
>computer and stop working until you contact
>Microsoft for a new activation key.
Except in a business environment, where this type of device is more likely to be encountered.
There, they'll be running XP Pro Corporate, which doesn't require reactivating every time you change a NIC.
I swear, MS flamebaiters and trollers could at least educate themselves about what they seem to hate so passionately...
I'm building systems people install into their network. The systems are running linux and contain an intrustion detection switch. All the switch does if it's tripped is give a message during bootup. My question is there a way to read the BIOS after bootup and then I can compare the two(not tripped/ tripped). I can figure somethings out, just wondering if someone has done some of this to help me out abit.
Thanks
Russ
russ_barber@yahoo.com
This project was only meant as a "case-mod" type security system, nothing serious as of yet. The device with my ASUS p3c-E motherboard runs while the computer is off too, with power from a clock battery or the like. So it will still work, even if you disconenct the power supply (kinda like how you don't have to reset the time when you unplug and move your computer to a LAN party or another room or something).
The PLA and VHDL idea was just for fun. If, say, you wanted to add a keypad or some crazy shit like that, you could. Yes, you can do this with 7400 series chips, that would be the easiest way; but why do it that way when you can put in a buzzer, a keypad, or anything you like with a PLA. Not only that, but if you only have one chip, and the pinout doesn't change, it makes for easier upgrades of the whole sytem. Sure, use 7400 series chips, if that's what you want. This paper was only meant as a fun idea for people to read over, nothing too serious.
No its not for sale, so no, I'm not a snakeoil salesman.
And by the way, I'm 18, not 14.
--red0x
it's easy to tell when someone unauthorized opens your case, the puslse magnet went off and nothing electronical within 8 feet works.
grin.
I have chassis intrusion on my system, a Dell Optiplex gx400. It's a mechanism consisting of nothing but a jumper connection on the mobo and a push-style switch mounted on the chassis. WHen the cover is closed the switch is pushed in (and said jumper is registered by the BIOS as being "closed"). If you open the cover the switch pops up and the jumper circuit is opened. This change of jumper state is detected by the BIOS, and the BIOS modifies the chassis intrusion detected bit to "1". When you turn the system back on it greets you with an "Alert! Cover was previously removed" screen. The only way to reset the alert is to go into the CMOS setup and change the "chasis intrusion detection" option from "DETECTED" to "ENABLED".
:] ). First off it's no good if the BIOS setup has not been password-protected, as any individual can go into the BIOS setup and reset the warning. There's also this workaround for the chassis intrusion switch that I figured out... cut the wire running from the chassis switch to the jumper connector in the mobo, and connect the two wires on the cable. Then sealing it with tape and tucking it away on the chassis railing. I did this hack on another Optiplex I owned and it worked. It never detected my chassis intrusions, so I could easily go in and out of my box without the pestering screen... I could also work with the machine being on and having the cover off (before I did the lil hack, it would automatically shut off if I opened - anyone know why this happened?).
However, this type of chassis intrusion is not 100% fail-safe (email me if you know of any that is 100% fail-safe....
Well I made my post, my contribution (even if it's painfully redundant)...
Quiet home 25-35
Background in private office 35-40 dB.
Human voice at 1 m 55-60 dB.
Average radio or TV 70-90 dB.
Unmuffled truck, police whistle 80-100 dB.
Rock band or very loud orchestra 100-120 dB.
Jet takeoff, artillery fire, riveting 120+ dB.
175 dB is 100 000 times louder than 125 dB.
actually the sound pressure will be 100 000 greater, but because human hearing is not linear, and responds logarithmically to sound, it would not be perceived that loud.
They had a medeco core in a plastic barrel, with a plastic lock arm inside.Pick-proof yes (even the three-tumbler version) but hardly secure.
That's definitely a different unit. The rs/6k deskside units rear-panel used a medeco turning a roughly 2" square steel plate which engaged the case and covered:
A 2 foot long screw lead to the front of the case, and locked the front-panel cover. The front panel control keyswitch prevented booting when in 'secure' position.
Basically yes you can always get inside but on these machines you're not gonna do it without breaking the case first.
The desktop rs/6k machines of more recent vintage use lower cost locks, dunno about the larger machines.
Linux is Linux, if One need clarify their dist: <Dist>/GNU Linux
bsds are of course just BSD
An old machine I bought from a local school district had a device in it called a 'Wobbler' which had a light sensor, a motion sensor, and a little piezo electric speaker which could be heard (loudly) from well down the hall. If you open the case or try to move it you set it off, and it's battery life was 48hrs of alarm.... I'd give up on stealing a pc before i carried that little thing around.
Who'd want to break into your case anyway?
or were you just really bored?
is slashdot the only organization who thinks your paper is news worthy?
just curious.
1. It never happenned.
2. If it did, you should still levy the concept of "innocent until proven guilty" into your judgements.
3. My mother is a bitch to those that deserve it. She is a tremendously generous person to those who need it.
4. It is the height of ignorance to make the number of assumptions you did
5. If you have nothing to contribute to the topic, then keep you filth ridden shithole shut.
6. Keep your judgemental attitude in check, lest I be motivated to find you, show up at your door, beat your ass, and leave you in the gutter for making smashmouth statements about my mother regarding an incident that never occurred.
Now, perhaps we can engage in a conversation about the fat whore who pushed you out. Oooh, not nice when people talk about your mother is it?
How inventive!! :) I kinda like Compaq's (The New HP! :) way of doing this. They have a push-button thingy in the case that triggers if the cover goes off. Combine this with the Compaq SNMP/DMI agents and they send a trap to Insight Manager tellig you that the case was opened. It also reports if any memory chips where removed, or changed, including serialnr. on the chip.
Most Deskpro models also have an magnetic lock device, that lets you lock the case from inside, using Insight manager, remotely.
Nice. :)
h0bbel
Just have it play a little Britney, same difference.
I heard making computer cases out of granit blocks makes them more secure too. ;-)
Lowtech solution:
:o)
Adhere a piece of tape that the opening of the case will pull off. The black helicopter pilot will notice the tape when he puts your box back together and replace it.
But you knew that so you blocked adhesive on part of the tape (maybe by just putting a piece of paper on it). Then you put a tiny bit of fluff against that adhesive free part of the tape. The fluff falls down and is lost. OH NO THE FLUFF IS GONE! ALERT!
If you need text styles to communicate then you don't have a message.