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Hello Guys!
I have a question which is definately seeking you experties, i have no knowledge about encryption, But i need to encrypt documents on the CD.
I want to know hoe to do this sort of work.
any sort of Information will be appreciated.
Thanx
Harbir
For what OS?
Since you say you want to encrypt a few documents on the CD, I have to also ask which OS are you using?
I can guess at a Windows machine though.
You CAN password protect a document in Word (you can encrypt also). Do this...
When you go to SAVE a document, click on SAVE AS..
Then, in the new window, in the upper right corner should be a TOOLS drop down menu.
click on TOOLS then Click on SECURITY OPTIONS (this may be different with a differnet version of WORD, I have 2003 installed on this box). You can password protect the document. You can put one password to view and a different one to edit.
In Word 2003, you can also click on the ADVANCED button and choose differnt type of encryption and key lengths.
NOTE: if someone can view, but not edit, they may be able to copy/paste into a different document.
good luck.
~Halv
Password protect word documents! hah thats laughable, of course you can but its weak so i wouldnt bother
try pgp or the gnu version gpg -
http://www.gnupg.org/(en)/download/index.html
its free to download and good for exchanging data like I assume you are going to with your CD??
OS isnt important with gpg becuase theres ports to most OS's
i2c
Hi there, How can I encrypt a presentation made in flash that run form a cd, but not be copied to HD.???
if its on a cd it can be copied to hard drive. simple.
I mean, you can read the info on the cd but you cannot take a file from cd and paste on HD.
I ve been made cd with cdlock and cryptcd but the info is easy copied to HD uncreypted.
there is no way.
If it is on a cd and readable then it can be moved to the HD. The trick will be making it as difficult as possible. I mean honestly, if there was a way to do this dont you think it would be on every cd and dvd out there.
I am with XTC46 on this one, you just cannot stop it being copied, that is why we have software and entertainment piracy.
The problem is that you can encrypt and password protect the presentation but no-one would be able to look at it without the key and the password..................and as soon as you give them those, it can be copied.
;)
Well, this may not be exactly what you are looking for, and i dont know what OS you are using, but maybe it could be of some help.
In the Linux 2.6 kernel (I am using 2.6.12) you can compile in support for encryption in the kernel using cryptoloop (Dm-crypt is also available)
When you configure the kernel, check support for Device Drivers -> Block Devices -> Loopback device support
(and might as well enable dm-crypt while you are at it, since dm-crypt will be cryptoloop's successor)
Device Drivers --> Multi-device support (RAID and LVM) --> [*] Multiple devices driver support (RAID and LVM)
<*> Device mapper support
<*> Crypt target support
And then under Cryptographic options, you have the following choices
-- Cryptographic API
<*> HMAC support
< > Null algorithms
<*> MD4 digest algorithm
<*> MD5 digest algorithm
<*> SHA1 digest algorithm
<*> SHA256 digest algorithm
<*> SHA384 and SHA512 digest algorithms
<*> DES and Triple DES EDE cipher algorithms
<*> Blowfish cipher algorithm
<*> Twofish cipher algorithm
<*> Serpent cipher algorithm
<*> AES cipher algorithms
<*> CAST5 (CAST-128) cipher algorithm
<*> CAST6 (CAST-256) cipher algorithm
<*> Deflate compression algorithm
< > Testing module
You can either compile these into the kernel or load them as modules
Anyways, after you have configured this kernel and booted it, you can then make an encrypted iso image of your document directory.
First, create an iso large enough to hold your documents
[root@localhost]#dd if=/dev/urandom of=crypt.iso bs=1k count=100000
next, you will need to use losetup with your encryption algorithm selection
[root@localhost]#losetup -e blowfish /dev/loop1 crypt.iso
You will be asked for your password. Make sure you enter it correctly, because it wont ask a second time for verification
note:if you compiled the encryption algorithms as modules, you will first need to load the module
[root@localhost]#modprobe blowfish
if you compiled them into the kernel, then you can skip that step.
next, you need to run mkisofs through the loop device using your documents folder
[root@localhost]#mkisofs -r -o /dev/loop1 /documents
next, create a mounpoint for the iso
[root@localhost]#mkdir /mnt/crypto
And then mount the encrypted iso
[root@localhost]#mount crypt.iso /mnt/crypto -t iso9660 -o loop=/dev/loop1,encryption=blowfish
password:
[root@localhost]#
[root@localhost]#cd /mnt/crypto
[root@localhost]#ls
doc1
doc2
etc
All your documents should now be listed in unencrypted form.
unmount the iso and unset the loop device
[root@localhost]#umount /mnt/crypto
root@localhost]#losetup -d /dev/loop1
and make sure that you have the correct password before burning the iso
[root@localhost]#mount crypt.iso /mnt/crypto -t iso9660 -o loop=/dev/loop1,encryption=blowfish
password:
[root@localhost]#
if you have the correct password, then you are ready to burn
[root@localhost]#cdrecord -v -dev=/dev/hdc -data crypt.iso
Now, after you have burned the encrypted iso to a disk, it will be stored in encrypted form. When you want access to the documents, you will be asked for the passphrase on mount, before it will be either mounted into the filesystem or decrypted.
[root@localhost]mount /dev/hdc
password:
[root@localhost]#
The only downside to this, is that you will not be able to gain access to your documents on any other system, unless it has the same support compiled into the kernel. However, this is a really nice way to store documents onto a CD. The cd will not even be mountable unless you have the password. hence, your files cannot be accessed, copied or decrypted.
Hope that helps you a little anyways.
Woops. I'm sorry. I screwed up. Trying to mount the encrypted ISO image on the CD with 'mount /dev/hdc' does not work. I don't know why I said that.
You have to use
mount /dev/hdc /mnt/crypto -t iso9660 -o loop=/dev/loop1,encryption=blowfish
In order to mount the encrypted CD. Sorry about that!