Encryption Decryption in Windows

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Hi Folks,
Struggling With Encrypted file , I have encrypted a file Using windows Encryption, and now unable to decrypt it as the User with which I encrypted it doesn't exist anymore, I formatted that OS. But the file is still encrypted, and I am unable to access that file.

how we can decrypt a file Encrypted by Windows encryption in Windows, when the user who encrypted that file doesn't exist any more..I tried..but didnt get anything...wanted to know if there is any Software available which can do this..

Any help is highly appreciated.

Posted 25-Jan-13 7:29am

Pravin291989

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Sergey Alexandrovich Kryukov 25-Jan-13 13:54pm

What encryption? There are many.
Basically, if you don't have a key for decryption, you cannot decrypt. Who is the user does not really matter, it does matter who has what key.
(Language? Platform (Windows native or .NET)?)
—SA

Abhishek Pant 25-Jan-13 14:05pm

use 7-zip a open source software.

2 solutions

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**Zoltán Zörgő** · Answer 1 · 2013-01-25T08:14:00

Solution 2

You mean NTFS encryption[^]? Forget it, you won't be able to decrypt it in a reasonable amount of time (several years).

To avoid such situations in the future, I suggest you study this article really carefully: http://technet.microsoft.com/en-us/library/cc512680.aspx[^]

No, actually you can try (buy) tools like this one: http://www.elcomsoft.com/aefsdr.html[^], and hope, that they worth the money...

Posted 25-Jan-13 8:14am

Zoltán Zörgő

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Pravin291989 25-Jan-13 15:05pm

Yeah the file is Encrypted by NTFS encryption. Isn't there any Freeware to Decrypt these kind of files..?

Zoltán Zörgő 25-Jan-13 15:18pm

I don't know of any. Search for it, but I am pretty sure you won't find any...

OriginalGriff · Answer 2 · 2013-01-25T08:11:00

If you have an encrypted file, and the user who encrypted it has left the company taking the password with him, then the file is useless (assuming it was encrypted with a reasonable algorithm rather than something home-brewed) unless you can contact him and ask for the password.

If you need the user ID to decrypt it, then recreate the user and see what happens.

But my guess is that you are looking at a useless file - encryption algorithms are very good, and it is extremely unlikely that you could "brute force" decrypt the file in this lifetime, unless processing power ceases to follow Moores Law[^] and fundamental changes to the design of computers occur.