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Criminals Remote-Wiping Cell Phones
An anonymous reader writes "Crafty criminals are increasingly using the remote wipe feature on the Apple iPhone and other business handsets, such as RIM's BlackBerry, to destroy incriminating evidence, the head of the UK's Serious Fraud Office Keith Foggon has warned. Foggon told silicon.com that the move away from PCs towards using mobile phones was causing a headache for crime fighters who were struggling to keep up with the fast pace of new handsets and platforms churned out by the mobile industry."
...who took one look at this and thought "good."
That just means the police need to work a little harder to make a case. It doesn't make it impossible though. The next hope is that they don't outlaw these devices or something. The Brits are a bit jumpy.
what do they mean by irretrievable:
destroying the filesystem table? (easy to get the data back)
writing all bits to zero? (still retrievable)
writing over all bits with (psuedo-)random data? (aparaently this can be retrieved)
writing over all bits repeatedly?
IranAir Flight 655 never forget!
Criminals destroy evidence that could be used against them. News At 11.
Anthropic principle: We see the universe the way it is because if it were different we would not be here to see it.
Don't forget to view the photos. I thought the photos were more interesting than the article.
http://software.silicon.com/security/0,39024655,39270417,00.htm
on a hard disk you would be correct, try it with anything else and you get bupkis back.
If the only evidence the police have on said 'criminal' is a string of bits on his cell phone, they probably didn't have much of a case anyway, and likely shouldn't be arresting this criminal.
I genuinely hope small time 'criminals' continue getting these sorts of victories to the point that our police forces are forced to admit they have failed in the war on consensual acts between adults. The change certainly isn't going to come about while our various wars continue to make a tidy profit for those at the top.
You have to use something like squid, but it's because of magnetic hysteresis. (I could explain, but Wikipedia is pretty acccurate.)
It's possible in theory, but in practice, it's technology that law enforcement doesn't have access to.
Magnetism is an analog property used to store digital information. A bit can be wiped so that a standard detector would read it as a zero, but the bit may be legible by a more sensitive detector.
For instance, say that anything above "0.5" (half of the full possible theoretical strength of the magnetic field there) is a 1, and anything below is a 0. Maybe, the drive would actually write "0.9", which would be correctly interpreted as 1. If that number was blanked, maybe it becomes "0.3"....low enough to be a 0, but maybe another detector could tell the difference and know what the original value was.
It is pitch black. You are likely to be eaten by a grue.
Remember, this is flash, not magnetic bits stored on a spinning metal platter were header drift and other things would theoretically allow you to retrieve data that has long been removed.
Recovering from (intentionally overwritten flash) may be considerably harder than a traditional drive. Most flash recovery apps for cameras, etc. are really just reading the stray bits, as the formatting, etc. does not actually wipe each sector (because flash is rated in number of write operations the individual bits can support before going bad, so you want to minimize that).
Overwriting a flash storage partition on an iphone or other device also makes this harder because you can't easily pop those things open and mount the custom flash chip into some universal adapter and read its filesystem like you can do with any old hard drive (they even make forensic, read only, hard drive enclosures).
So I zero out the data on my iphone, and well, there aren't any jailbroken or app store apps that you can run on the damn thing to do a low level recovery anyway, and I don't know of any target disk raw access mode to the device when attached to a computer that is available outside of apple's developer labs.
...that could be used against them?
Honestly, if the only case the prosecution has is possible evidence on an iPhone, their case is pretty shaky to begin with. Do REAL WORLD investigation you Nazi-a-holes, not worry about virtual evidence that you might or might not be able to get to!
Go to Options-Security Options-General Settings. Enable password and content protection. Set the security timeout and password attempts to your preference. Now, when the timeout expires (X minutes after you stop hitting buttons) or you hook it to a PC, it asks for a password. If someone types in the wrong password Y times (10 is default, but you can go lower), it forces a reboot, and scrubs down the memory, which takes 20 minutes to an hour.
To force the scrub, go to Options-Security Options-General Settings. Click the menu button, select "Wipe Handheld", type blackberry.
Send me a PIN message at 244EB7DA if you need a hand.
"I think an etch-a-sketch with an ethernet port would beat IE7 in web standards compliance."
I'm glad these articles focus on the negative facts that police have trouble with, and not the USEFUL part of remote data wipe so that millions of customers data can be deleted when a device is lost, instead of having that information in the hands of people that could do some damage. I'll take a wipe of evidence for that security any day.
PS: For remote wiping, you need to be on a BlackBerry Enterprise Server (BES), which usually means your BB is company-issued. If you need it nuked, call up your admin and ask him to trigger the remote wipe. Keep in mind that the BES can (and usually does) track anything and everything that happens on a BES-connected BB, so a wipe will do nothing to hide things from your company.
"I think an etch-a-sketch with an ethernet port would beat IE7 in web standards compliance."
If you are really paranoid, you'll want your laptop or cell phone to:
With this, only experts will be able to copy your device much less decrypt it, and they will have a limited time window to do the copy.
Such a phone or laptop would be good for crossing national borders or any other place where it is subject to search or seizure. If the border guards take it and try to copy it, they may give you back a brick, but at least they won't have anything useful.
Of course, this means you should have your irreplaceable data someplace else for safe-keeping. Think of your phone or laptop as a "convenience copy."
Knowledge is how to play a game, intelligence is how to win, wisdom is knowing what game to play.
Here's an interesting bit too. Looks like they try simple password protection breaking, but...
The team does not attempt to crack high-grade encryption, relying instead on the threat of a prison sentence for individuals refusing to hand over passwords or decrypted files.
And there's probably a certain amount of hysteresis too, so maybe that 0.3 gets overwritten with a 1 to become 0.93, and then with another 0 to become 0.393, and you can recover previous values to a degree limited by the amount of hysteresis, sensitivity of the detector, and noise floor. Or at least that's the theory I've always heard on why you're supposed to overwrite hard drives multiple times... I've never actually heard of it being done, but the assumption has always been that 'they' have the ability to do it. Anyone care to provide more substantial information on the feasibility of this sort of recovery?
if the cops had any brains they would shut off the phones (remove battery) the second they get it and then give it to forensics that should have the IQ to operate it in a faraday cage so that it cant be tampered with remotely. Do they take laptops and PC's they capture and hook them to the net and turn them on? Why do they connect phones to the network when they look at them?
Come on, I though they taught the police how to handle evidence. Are you telling me that CSI tv show is a LIE!!!!
Do not look at laser with remaining good eye.
Not to mention right near the top of the ARTICLE ITSELF:
"Because we isolate the devices immediately, and never reconnect them to their network, the remote wiping capability does not present us with much of a problem," he noted.
Um, so the problem is? Talk about sensationalism.
W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.
Modern hard drives pack bits *very* densely. The bits overlap by a large amount. The technology to determine whether a bit is 1 or 0 by calling everything above 0.5 a "1" is already necessary to read the bit *normally*. Writing random data to the drive is enough to make any active sectors unrecoverable.
However, modern drives have a huge count of spare sectors, and sectors get retired constantly, and there's no way to wipe those with normal reads and writes. So there's a random sampling of everything you've ever written stored in the retired sectors of a hard drive, and no in-band way to wipe those sectors.
The is why the government standard for hard drves that have ever contained classified information is to shred the hard drive so that the pieces fit through a 1mm sieve. Of course, in reality, the government is just as likely to sell the drives unwiped on Ebay, but that's bureaucracy for you.
Socialism: a lie told by totalitarians and believed by fools.
When I took my computer forensics class they showed that you could use a hex editor on a zero wiped floppy disk and recover most of the data that was on it previously.
We had a guest speaker that told us some of what he does, he's a forensic analyst that pulls information from drives in criminal cases. He said that it takes somewhere around 72 hours to read a decent sized drive and costs around $10k to get it done.(It's been a few years so the details are fuzzy but that sounds about right)
But he wasn't too specific on what tools they use etc. Something around 10 full wipes is easy enough to recover the original data but if you write over it and delete actual data it becomes more corrupted and harder to get back than just all 1 then all 0.
If you manually enable "Content Protection" on your BlackBerry, doing a Security Wipe will take on the order of hours, and will overwrite the data several times with different patterns to the point that it's not recoverable by anyone, even RIM (if you don't have that mode enabled, a Security Wipe will only erase user-specific information, and it would be relatively trivial to recover it).
If you're on a BES (meaning your BlackBerry was issued and is controlled by your workplace), your BlackBerry administrator can enable this setting without your input though an IT Policy, and can remotely initiate a Wipe/Shred from within the BES control panel.
Cue The Sun...
It was added as part of the 2.0 firmware upgrade.
http://www.apple.com/iphone/enterprise/
eatures include:
* Push email
* Push contacts
* Push calendar
* Global Address List (GAL) support
* Certificates and identities
* WPA2/802.1X
* Enforced security policies
* Cisco logo More VPN protocols
* Device configuration
* Remote wipe
Sorry it sounds like a "In Soviet Russia" thing but it is true.
Symbian/WinMobile smart phones have tools to lock the handset remotely or in case of new Kaspersky antivirus/security or other 3rd solutions, you can remotely instruct phone to delete all personal data irrecoverably and lock itself. I am almost sure Blackberry, being an enterprise focused device must have similar option.
Once the Apple decided not to allow background running processes, they lost that possible solution. Not just they don't allow anyone to implement it, they don't implement it themselves too.
It is a completely fool safe thing. User sends a previously set SMS to device, device locks itself. Or in Kaspersky case, it doesn't just lock itself, it wipes its data and optionally transforms itself to a white hat (for you) rootkit/trojan and sends the number of first SIM card plugged to device to previously set number.
When I took my computer forensics class they showed that you could use a hex editor on a zero wiped floppy disk and recover most of the data that was on it previously.
Do you know how this is done? Because if one just uses a hex editor, wouldn't the hex editor simply see a disk full of nulls?
A cat can't teach a dog to bark.
Does anyone know, off-hand, a way to query a sata disk for at least a count of how many sectors have been re-allocated, if not an actual map of them?
In linux, you can use smartctl (from smartmontools, I think)-- /dev/sda, and look for "Reallocated_Sector_Ct" in the output.
smartctl --all
A cat can't teach a dog to bark.
I have a program on there that'll reformat the hard drive and zero everything else out, as well as disabling the SIM card, if I text it a certain phrase. Of course, it isn't all that helpful if whoever gets ahold of my phone just turns the radio off or removes the antenna so it can't receive that message, but I guess I have to count on criminals not knowing much about PalmOS since it's apparently a dying platform or something.
any tool that accesses the drive's smart data can get this. the drive has to be directly connected to the computer, you cannot read smart via usb or firewire bridge. All drives track a small set of smart data including reallocated blocks. Most drives have additional smart parameters whose meaning varies.
I work for the Department of Redundancy Department.
you can't easily pop those things open and mount the custom flash chip into some universal adapter
Very very few devices use custom flash chips. The iPhone uses off the shelf standard flash memory chips. And in addition to readers that require the removal of the chip, there are units that have cables with clips that just attach right to the chip in the (powered off) device and can pull the data straight off.
And yes you can pop them open pretty easy. Some ipods are harder to open than an iPhone.
I work for the Department of Redundancy Department.
Two things.
First, ever had a magnet accidentally come into contact with your TV? Ever tried to fix it with another magnet, and deemed it "close enough"? There you go. You are a floating head. Your TV is a disk platter.
Second, hand in your geek card.
Assume I was drunk when I posted this.
The idea made me curious. I just wrapped my phone (mobile) in a rather large ball of aluminum foil. I then called it. Err... It still rang. I don't have any scientific evidence to say why, how, or all that but it rang. I obviously couldn't answer it.
"So long and thanks for all the fish."
yeah that sounds like BS to me, I'd like to hear an explanation too. The magnetic explanations people have posted above are far more consistent with what I've heard about data recovery from wiped disks, which all involved hardware -- I've never heard of recovery through software alone, and it doesn't seem plausible. A hex editor would obviously be able to "undelete" data that had been "deleted" in the normal way, but I can't see how it would get to data that had been nulled.
NOT A SCIENTIST... So... I was curious. The dimensions were *about* 8" across with the phone in the center. Since I have had people tell me to drill holes in it. I will try that next.
"So long and thanks for all the fish."
yes, drilling holes in your phone would definitely stop it from connecting to the cell network.
A Faraday cage needs the cage and the object to be electrically separated. Otherwise, you just gave your device a big antenna.
I suppose if you are an organized crime syndicate, yes, they are interfering with your business plan. Perhaps you should inform all of your employees, er... henchmen, to please refrain from leaving their iPhone at any crime scenes they have created.
W..w..W - Willy Waterloo washes Warren Wiggins who is washing Waldo Woo.
Show me how to easily take the battery out of an iPhone. Please.
Do not fold, spindle or mutilate.
If it's truly a proper Faraday cage for the frequencies involved, it doesn't matter if the object and the cage are electrically separated or not -- it'll still work. This is a function of Gauss's law.
In this case, either the aluminum foil wasn't thick enough, or the gaps in it were too large. A cell phone is generally pretty sensitive, so even if you reduce the signal by a factor of one million, it may still be able to pick it up.
Since every time something like this comes out all kinds of FUD pops up about data erasure, etc...
A classic paper on secure data deletion & recovery:
http://www.cs.cornell.edu/people/clarkson/secdg/papers.sp06/secure_deletion.pdf
Enjoy
Shop smart, Shop S-Mart.
Wrapped carefully and it did not ring. :)
"So long and thanks for all the fish."