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AES-256 bit encryption...
 Moderated by: cjustice  

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Gabrielelohim
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 Posted: Tue Apr 15th, 2008 10:09 pm1st Post

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hello all,
got a forensic password recovery question... i promise that this IS REALLY A CLASS ASSIGNMENT and i'm not doing anything nefarious lol ;~)

we roll play in class and go through all the steps of a forensic examination / investigation, from getting a warrant / or permission from the company, to photographing the scene interviewing witnesses, writing reports etc. etc.etc.

anyway for this assignment we were hired by xxx company, to do a forensic examination on a particular employees machine. human resources is already involved, and the companies IT dept thinks that this particular workstation has been compromised...

among the 35k + files on the image, there are three (3) encrypted files, problem is they were encrypted using AES-256 bit encryption...

a known plain text attack doesn't seem to work although i may not have the correct plain text. but i'm sure that i have the correct compression scheme used to compress the files (PKZIp 9.0).

i exported a word list from the image, and have been running a dictionary attack against it using PRTK for about 18 hours now. so far no luck...

i have attached a copy of the file for you all to try if you would like and i would like to make it clear that if you DO crack the encryption i don't just want the answer. what i would like is some hints to point me in the right direction...

best regards,

gabrielelohim

Attachment: hardfile[19090][19090].zip (Downloaded 0 times)


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