Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: If you use 256 AES encryption with a 50 character password how long...

06 Nov 2010   #1

Windows 7
If you use 256 AES encryption with a 50 character password how long...

would a brute force attack take to crack the code if you used alpha numeric as well as special symbols?

I have been lead to believe that it would take a super computer many many years to crack but I am not to sure of this so can you please help to shed some light on this.

My reason for wanting to know this is because I used bitlocker and WinZip to encrypt my drives and folders, and they both use AES 256 encryption. I know that every type of security is breakable given time, effort and the will to do it, but what would be the time frame for this scenario.



My System SpecsSystem Spec
07 Nov 2010   #2
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1

Even with a supercomputer designed specifically for the task, I'd say we're still talking hundreds of years, if not thousands. Baring an incredible stroke of luck of course. I found this:

AES permits the use of 256-bit keys. Breaking a symmetric 256-bit key by brute force requires 2128 times more computational power than a 128-bit key. A device that could check a billion billion (1018) AES keys per second would require about 3×10'51 (that's 10 to the 51st power) years to exhaust the 256-bit key space.
Brute force attack - Wikipedia, the free encyclopedia

A Guy
My System SpecsSystem Spec
08 Nov 2010   #3

Windows 7 Ultimate x86 SP1

It will take ages.

In reality, noone will even try to break that kind of encryption with simple bruteaforce attack. It is silly.

Today's encryption is mathematically almost impossible to break.

Problem is not with an encryption. Problem lays how it was implemented.

Nowadays, people don't break encryption with bruteaforce (maybe that do, but thats stupid ).

Actually most even don't break encryption itself.
As far as I know, most of the breaks are due to flaws on Implementation!

It is not a problem of encryption. Encryption is broken due to weak points of ways of Implementation of it or weak points of software that does it.

(I am not taking into account dictionary attack, keyloging because they are different subject)

I am not saying encryption is perfect or unbreakable. I am just saying that it is A LOT easier to find flaws on Implementation of it.

For example, it may take just 2 minutes If Microsoft has a back-door to Bitlocker... ( I am not trying to accuse them, it was just an example which was relevant to your case)
My System SpecsSystem Spec


 If you use 256 AES encryption with a 50 character password how long...

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar help and support threads
Thread Forum
biggest encryption std to date+ most power encryption soft ?
biggest encryption std to date+ most power encryption soft ? nowadays I am so much excited about encryption after watching BlackHat 2013 videos and Def Con 19 ,20 can u help me to find out words most powerful encryption software and methods and where to learn it I think doing PHD in...
System Security
A very long Password is automatically appears when I start my Windows
A very long Password is automatically appears when I start my Windows can someone please help. I am on Lenova Intel Core i5
General Discussion
Bitlocker Drive Encryption doesn.t recognize my password
hello, i use Bitlocker Drive Encryption to lock one partion from two. Everything goes corectly, but after i change my MotherBoard of mai Dell Inspiron Laptop and i put my password, doesn.t work. Bitlocker said isn.t the right password. Im sure about my is true. My warranty changed just...
System Security
Lost encryption key, remember password
Hi folks, I have win 7 ultimate 64bit and a while ago i tampered with file encryption and was dumb enough not to back up my encryption key. However, i remember my password that i used to encrypt those files. I formatted C: and re-installed Win7, just to notice i can't access some of my...
General Discussion
Slow deletes (character by character)
This probably has nothing to do with Windows 7, but I thought someone on this forum would know. When in a text editor like on this forum or on Microsoft word and when I delete and hold it down it will be really slow. Characters would only delete every half a second no matter what. Anyone...
General Discussion
BitLocker Drive Encryption - Change Encryption Method and Cipher Strength
How to Change Windows 7 BitLocker Drive Encryption Method and Cipher Strength This will show you how to change the encryption algorithm and key cipher strength used by BitLocker to encrypt drives in Windows 7.BitLocker Drive Encryption supports 128-bit and 256-bit encryption keys. Longer...

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 19:15.

Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App