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Posted by Jim Bilgin on December 10, 2007, 2:32 pm
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Hello,
How can I securely transfer files using a recordable CD from one XP to the
other.
The XP Pro's native file encryption works only in the same HD. The moment
the file is copied to any other media it disables its security feature.
Is there any Microsoft product or a Freeware software that does not expire
nor has a number of files limitation for this purpose?
Thanks
Jim
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Posted by moncho on December 13, 2007, 8:46 am
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Jim Bilgin wrote:
> Hello,
>
> How can I securely transfer files using a recordable CD from one XP to the
> other.
> The XP Pro's native file encryption works only in the same HD. The moment
> the file is copied to any other media it disables its security feature.
>
> Is there any Microsoft product or a Freeware software that does not expire
> nor has a number of files limitation for this purpose?
I would recommend using Truecrypt. www.truecrypt.org
You can create an encrypted volume on a CD-R/RW DVD-R/RW and use that.
You can also create a Traveller Disk on the same CD/DVD so that when
Autoplay starts, it can start the Truecrypt also. I believe you will
need Admin privileges if Truecrypt is not installed and started on
each machine.
What about a USB key? Grab a cheap 2.0 GB SanDisk Cruzer USB key and
enable its internal encryption located on the key itself.
moncho
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Posted by Alun Jones on December 13, 2007, 5:42 pm
Please log in for more thread options > How can I securely transfer files using a recordable CD from one XP to the
> other.
> The XP Pro's native file encryption works only in the same HD. The moment
> the file is copied to any other media it disables its security feature.
>
> Is there any Microsoft product or a Freeware software that does not expire
> nor has a number of files limitation for this purpose?
If you want just to use Microsoft free tools, you can do this. Here's a
rough description:
1. Encrypt the file.
2. Use NTBackup to create a backup of the file, including the encrypted
state, into a .bkf file.
3. Burn the .bkf file onto CD, and send it to its destination.
4. Use NTBackup to restore the file.
5. Decrypt or access the file.
Extra care is required in step 1 - the file needs to be encrypted using a
key that you will have in place in step 5.
If you've got your key in both boxes, either because you've exported and
imported it, or you're logged on as the same user and you have your EFS key
stored in your roaming profile, then there's nothing to worry about.
If the keys aren't quite that friendly (let's say you're taking a file to
another domain), you'll have to make sure that you encrypt the file with the
recipient's key.
Not too hard:
1. export the certificate from the recipient - open certmgr.msc, right-click
on the EFS certificate, and click "export". Export to a CER format, and
don't, don't, don't export the private key. It's private.
2. Send the CER format to the user who's going to encrypt the file.
3. The user who is going to encrypt (or has encrypted) the file imports the
CER file into his "Other People" certificate store in certmgr.msc.
4. Right-click the file you've encrypted, select Properties -> Advanced ->
Details, and then "Add User..."
5. Select the certificate of the recipient.
Now you can do the NTBackup step.
I haven't yet figured out how to do this in Vista, because NTBackup isn't
there, there's no command-line backup tool, and indeed, there's no tool for
backing up an individual file or folder.
Alun.
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