A real source file shredder?
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Yes, that's what I said. Although, as someone else said, if that works, why do you need to do it several times ?
Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.
The magnetic 'shadows' of previous bits written can be measured and analyzed. For this the drive has to be taken apart in a clean room and the disks inside must be analyzed with sensitive equipment. That's quite expensive. Rewriting several times leaves little to be analyzed.
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
How about an EMP. A big one. Not only will do the file in, but will render the HD unuseable. :)
Chris Meech I am Canadian. [heard in a local bar] In theory there is no difference between theory and practice. In practice there is. [Yogi Berra] posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]
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I've heard 6 times is usually the standard, however, I have also heard that the first time you write to the disk (on a new disk), there may be ways to tell which bit was stored. So overwriting may not work on a virgin drive. You may have to prime a drive by filling the disk with random data first. I would know more, but the only computer forensics expert I knew is no longer alive. Sorry I don't have any sources for this, I'll look later.
So overwriting may not work on a virgin drive. You may have to prime a drive by filling the disk with random data dinner first.
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So overwriting may not work on a virgin drive. You may have to prime a drive by filling the disk with random data dinner first.
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
You can always just save it in SourceSafe. That'll shred it. Big time.
I'm not a stalker, I just know things. Oh by the way, you're out of milk.
Forgive your enemies - it messes with their heads
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How about an EMP. A big one. Not only will do the file in, but will render the HD unuseable. :)
Chris Meech I am Canadian. [heard in a local bar] In theory there is no difference between theory and practice. In practice there is. [Yogi Berra] posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]
And also fry all other electronics in the area. Good idea. Set off an EMP, I would suggest a high yield nuke outside the atmosphere right above your house, and your data will be safely erased.
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
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You can always just save it in SourceSafe. That'll shred it. Big time.
I'm not a stalker, I just know things. Oh by the way, you're out of milk.
Forgive your enemies - it messes with their heads
except in this case Murphy's law will kick in and preserve the file for generations to come ;P
Yusuf May I help you?
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i have found that wine only affects the last 12-15 hours of memory. :-\
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And also fry all other electronics in the area. Good idea. Set off an EMP, I would suggest a high yield nuke outside the atmosphere right above your house, and your data will be safely erased.
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
All true. Probably should have suggested an NNEMP[^] instead. :)
Chris Meech I am Canadian. [heard in a local bar] In theory there is no difference between theory and practice. In practice there is. [Yogi Berra] posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
<conspiracy> all hd have double the advertised size and everything you write on it will be copied to a hidden partition ... and if you delete a file, multiple copied will be done , just in case. </conspiracy>
Watched code never compiles.
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Ahh, I have seen that show only a few times. It would have been clear if you had said that Spock could do this with his Tricorder and some logical deduction :)
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
CDP1802 wrote:
It would have been clear if you had said that Spock could do this with his Tricorder and some logical deduction
But only after he constructed a "mnemonic memory circuit" from stone knives and bearskins... :-\
WE ARE DYSLEXIC OF BORG. Refutance is systile. Your a$$ will be laminated. There are 10 kinds of people in the world: People who know binary and people who don't.
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
http://www.ameri-shred.com/equipment/industrial/hard-drive.html[^] That should work...
WE ARE DYSLEXIC OF BORG. Refutance is systile. Your a$$ will be laminated. There are 10 kinds of people in the world: People who know binary and people who don't.
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
Windows indexing.
"People who bite the hand that feeds them usually lick the boot that kicks them." Eric Hoffer
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CDP1802 wrote:
It would have been clear if you had said that Spock could do this with his Tricorder and some logical deduction
But only after he constructed a "mnemonic memory circuit" from stone knives and bearskins... :-\
WE ARE DYSLEXIC OF BORG. Refutance is systile. Your a$$ will be laminated. There are 10 kinds of people in the world: People who know binary and people who don't.
Don't disturb him when he does that. Otherwise he might remove a multi-legged creature from your shoulder.
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
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The magnetic 'shadows' of previous bits written can be measured and analyzed. For this the drive has to be taken apart in a clean room and the disks inside must be analyzed with sensitive equipment. That's quite expensive. Rewriting several times leaves little to be analyzed.
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
CDP1802 wrote:
Rewriting several times leaves little to be analyzed.
According to the Eraser[^] file shredder utility the US Govt standard is 35 passes. It isn't on the page I linked to above but I saw it in documentation for a previous version. [Edit] I've just noticed the url for the link above. If the choice was deliberate, if you know what I mean, it's very amusing. :) [/Edit]
Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.” I wouldn't let CG touch my Abacus!
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
Here's an article I found a few years back. http://www.trouble.org/security/secure_del.html[^] Here's a copy: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html[^] I wrote a C program that implements it. I never use it though, I just can't summon enough paranoia. Edit: I guess I should have tested the URL first, maybe it has ben deleted. :sigh:
modified on Thursday, January 20, 2011 11:56 PM
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You can always just save it in SourceSafe. That'll shred it. Big time.
I'm not a stalker, I just know things. Oh by the way, you're out of milk.
Forgive your enemies - it messes with their heads
Quaint. We've been on VSS for about 7 or 8 years. Properly set up and used, data loss was not a problem.
FILETIME to time_t
| FoldWithUs! | sighist | WhoIncludes - Analyzing C++ include file hierarchy -
Sorry for my ignorance. Who's Abby?
A while ago he asked me what he should have printed on my business cards. I said 'Wizard'. I read books which nobody else understand. Then I do something which nobody understands. After that the computer does something which nobody understands. When asked, I say things about the results which nobody understand. But everybody expects miracles from me on a regular basis. Looks to me like the classical definition of a wizard.
Gibbs is going to slap you
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Jun Du wrote:
What are reasonable requirements for a source shredder?
IMO, a program which will simply overwrite a file several times with random data, although I read once that it should be several dozen times to be 100% sure it's gone.
See if you can crack this: fb29a481781fe9b3fb8de57cda45fbef
The unofficial awesome history of Code Project's Bob! "People demand freedom of speech to make up for the freedom of thought which they avoid."
You just need to ovewrite once all the bytes with zeroes, unless you're afraid the data get's analyzed by specialized equipment and environment in the search for magnetic trces left behind. But I beleive that when that's is the case, it's usually because there is jail time in question if someone retrieves that information. So I think most here don't need to worry about that.
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A recent source file delete program "Secure Delete .Net"[^] reminds me of a real source file shredder. What are reasonable requirements for a source shredder? To me, a couple of requirements are obvious 1) do not delete files but cut them into unrecognised pieces 2) cutting shall be random
Best, Jun
Additional thoughts, if you are talking about securely deleting source files from you development machine you also have to track any temporary file copies that your IDE makes and overwrite those drive locations as well. The problem there becomes that these temporary files would have to be tracked and erased from the start or you would have to have a good method of looking back through the file structure to see what is recoverable (like a file recovery tool does) and then overwrite them then. And I belive that Solid State Drives like thumb drives behave differently than standard spinning hard disk drives making the overwrite method not work as effectively but I can not find the reference to the article I read about that.