Bitlocker as example uses AES 128 Bit encryption as default - if it was brute forced how it can be done , I mean where's the file that will be brute forced to generate the password (If I'm right that file is suppose to be the 128 keys generated from the encryption right?) I'm not asking about software to do this ( I'm aware that some apps uses hibernation file or memory dump file to do so) I'm asking about how to find it manually , If i deleted both previous files and stopped any administrative privileges for installing any software will it be impossible ??
put on hold as unclear what you're asking by yyyyyyy, Henrick Hellström, e-sushi♦ Oct 2 at 1:04
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If I'm understanding your question right, you're asking "How to brute-force the Bitlocker encryption without being able to install stuff and without using "backdoors" and without having the key-file (if used)?"
You can't brute-force AES-128 without the said key-file.
If you have access to the encrypted key file and it uses a password there is a chance you can break the encryption scheme.
Note that the inability to install custom software isn't a restriction in the usual threat model for drive encryption. Usually it is assumed to have physical access to the drive and being able to read sectors while at rest. So one could look for a known structure to perform the brute-force attack so this is feasible (in the right scenario).
TL;DR: You can't break AES, but a password if used, so the password may be weakest point to attack.