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Topic Started: Jan 8 2007, 10:05 PM (244 Views)
xericx	Jan 8 2007, 10:05 PM Post #1
Just registered Posts: 3 Group: Members Member #396 Joined: January 8, 2007	Hi I am a new member to this forum and I am asking anyone who know a lot about encryption for your help. I am going through a major problem after using a file encryption software called da vinci encrytion software. I used this software and I encrypted a lot of important documents which I do not have a back up of and when I did a full system recovery after formatting my hard drive i found out through its customer support the the da vinci software did not work if you didn't have a certain file that you had in the install directory before i formatted the the hard drive if you wanted to decrypt or use the encrypted file. So I am in a bad situation and wanted to know if theres a way I can decrypt this file I made with da vinci encryption software. Can anyone help me solve this problem. Thank you.



Donald	Jan 8 2007, 10:13 PM Post #2
Elite member Posts: 454 Group: Trusted Member Member #8 Joined: September 2, 2005	Can you provide a link to the documentation for the software?



xericx	Jan 8 2007, 10:14 PM Post #3
Just registered Posts: 3 Group: Members Member #396 Joined: January 8, 2007	yes thanks in advance. da vinci encryption software http://www.open-ita.com/



jdege	Jan 8 2007, 10:20 PM Post #4
Elite member Posts: 263 Group: Admin Member #246 Joined: December 7, 2006	xericx Jan 8 2007, 10:05 PM I am going through a major problem after using a file encryption software called da vinci encrytion software. I used this software and I encrypted a lot of important documents which I do not have a back up of and when I did a full system recovery after formatting my hard drive i found out through its customer support the the da vinci software did not work if you didn't have a certain file that you had in the install directory before i formatted the the hard drive if you wanted to decrypt or use the encrypted file. It sounds as if they're telling you that you can't read the files you've encrypted with the key, and that the key was stored in that file in the install directory. Is there anything you can do? Yes. But it's not what you're thinking. There are encryption systems that can be cracked without the key. But Da Vinci Encryption uses AES. Unless the developers seriously screwed up their implementation, you're not going to be able to decrypt the files without the key. At this point, I'd turn off the computer - before you write anything else to that hard drive - extract the hard drive, and take it to one of the computer forensic shops. It's possible that they may be able to recover the key file, even after the formatting. But every block you write to that disk makes it less likely.
	When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.


xericx	Jan 8 2007, 10:23 PM Post #5
Just registered Posts: 3 Group: Members Member #396 Joined: January 8, 2007	so theres no way of decryting the file?



rot13	Jan 9 2007, 01:32 PM Post #6
Elite member Posts: 306 Group: Trusted Member Member #14 Joined: September 29, 2005	xericx Jan 8 2007, 10:23 PM so theres no way of decryting the file? jdedge's suggestion sounds pretty good. If you have access to another computer, you might try setting up DaVinci there. I assume that you supplied a password when you first installed it, or when you encrypted your files. If not, then it doesn't look good (try a forensics place). If you did supply a password, maybe another installation using the same password might generate the file you need.



Revelation	Jan 9 2007, 03:10 PM Post #7
Administrator Posts: 386 Group: Admin Member #1 Joined: August 23, 2005	I think the file is generated with a password, just like rot13 said. You should give that a try!
	RRRREJMEEEEEPVKLWENFNVJKEEEEEAOLKAFKLXCFZAASDJXZTTTTTTTLSIOWJXMOKLAFJNNKFNXN RAGRBAQEMHIGDJVDSEOXVIYCELFHWLELJFIENXLRATALSJFSLCYTKLASJDKMHGOVOKAJDNMNUITN RRRRLJVEEEEECLYVYHNVPFTAEEEEEMWLMEIRNGLARWJAKJDFLWNTIERJMIPQWOTZEOCXKNUBNXCN RJIRPOWEANFUSNCZVDVZNMSFEKLOEPZLDKDJWSAAAAAAAOERHJCTNCKFRIMVKSOFOMKMANREWNBN RZUDRGXEEEEENFQIDVLQNCKNEEEEEDGLLLLLLAWIOSNCDARLODMTOEJXMILDFJROTKJSDNLVCZNN


loki	Jan 9 2007, 11:15 PM Post #8
Advanced Member Posts: 87 Group: Members Member #48 Joined: April 28, 2006	I emailed The company asking about any possible recovery method and to find out which of the AES they were using, granted Rijndael is normally what they mean, however, I have seen twofish (bc wipe). Quote: DaVinci Encryption System using AES256 encryption algorythm. You can be surethat w/ our product your data will be safe. this is all they said
	c(x) = 3x3 + x2 + x + 2; Find the inverse


Donald	Jan 9 2007, 11:29 PM Post #9
Elite member Posts: 454 Group: Trusted Member Member #8 Joined: September 2, 2005	twofish was an AES contender, but was not selected. Although the panel said that any of the final contenders would have been good enough, they chose Rijndael. so if they say they are using AES, it should be Rijndael. But the either way, breaking the encryption without the key should be impossible. The issue is WHAT exactly is in that file that was lost. I suspect that the file contains a randomly generated key, and the users password was used to encrypt that key. SO, without both the password AND the file, the user is hosed.



loki	Jan 10 2007, 03:27 AM Post #10
Advanced Member Posts: 87 Group: Members Member #48 Joined: April 28, 2006	I agree, AES should mean Rijndael. My thoughts on it are, if it can be done it can be undone, its only a matter of time. However, it should be unlikey that AES be broken any time soon. With Davinci not really responding to my inquiry, I would say in my humble opinion your files are lost, and you learned the all time lesson of backup backup backup! Have you tried reinstalling and using the same key? But as Donald has said I would bet that the key is random entrophy and its only protected by your password. If such is the case its even more unliky to have that recovered? I never encrypt anything with backing it up first. I made the mistake of using a disk encryption program and encrypting all my pictures, While I was out training my roomate downloaded a ton of spyware and thought it be a favor to me to redo the OS, I never recovered a few years worth of data. booo. Backup, backup, backup.
	c(x) = 3x3 + x2 + x + 2; Find the inverse


jdege	Jan 10 2007, 01:43 PM Post #11
Elite member Posts: 263 Group: Admin Member #246 Joined: December 7, 2006	loki Jan 10 2007, 03:27 AM Backup, backup, backup. With large hard drives being as cheap as they are, and large backup media being as expensive, backups aren't easy. My last system had a ZIP drive installed that I used for backups - until the drives became so big that backups were unmanageable. What I did on my current system was to install a pair of removable hard drive emclosures, and buy four identical drives. My backup procedure consists of doing a complete copy from one HD to another. My restore procedure is to install a backup drive, and boot. If you're going to do something similar, you will need at least three drives. You won't want to be writing over your only backup every time you do a restore.
	When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.


loki	Jan 10 2007, 03:32 PM Post #12
Advanced Member Posts: 87 Group: Members Member #48 Joined: April 28, 2006	My Method is to rar or zip my personal data (text documents, photo`s, spreed sheets, game saves, favorates etc etc), then I will save important system information, public keys, fonts, cookies, or photoshop settings. everything else to me can be replaced with a reinstall; DVD backup are my norm, and blue ray looks very promising for even larger backups, I spilt my drive into two partitions as well and save all my important stuff there as well in case the first partition fails, the archive fails. It seems a little much and maybe even a little silly to do it this, however it works great for me and with a DVD-RW its cost effective.
	c(x) = 3x3 + x2 + x + 2; Find the inverse


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