[SOLVED] Best software to decrypt an AES 128 file

Filippo.rosa · 08-27-2015, 03:36 AM

Hi all, I've already read THIS THREAD but when I run

Code:

openssl enc -d -aes128 -in myfile -out outfile

I got the bad magic number error.

I've got an encrypted video file, I remember the encryption password but I don't know how to decrypt the file. I don't have the original encryption tool. Is there any useful software?

linosaurusroot · 08-27-2015, 04:37 PM

Maybe there's a chaining mode used too. -aes-128-cbc or similar.

jefro · 08-27-2015, 05:56 PM

http://askubuntu.com/questions/60712...-file-with-aes

Filippo.rosa · 08-28-2015, 04:07 AM

Hi,
I've tried all the aes-128 chaining modes in openssl, same 'bad magic number' error.
I've also tried 'p7zip -d myfile' getting 'unknown suffix' error.
With 'gpg --decrypt myfile' I get:

Code:

gpg: failed to create temporary file `/home/filippo/.gnupg/.#lk0xdb7390.mypc.4138': Permission denied
gpg: keyblock resource `/home/filippo/.gnupg/secring.gpg': general error
gpg: failed to create temporary file `/home/filippo/.gnupg/.#lk0xdb75f0.mypc.4138': Permission denied
gpg: keyblock resource `/home/filippo/.gnupg/pubring.gpg': general error
gpg: the IDEA cipher plugin is not present
gpg: please see http://www.gnupg.org/faq/why-not-idea.html for more information
gpg: IDEA cipher unavailable, optimistically attempting to use CAST5 instead
gpg: [don't know]: invalid packet (ctb=7e)
gpg: WARNING: message was not integrity protected
gpg: invalid marker packet

I'm a newbie to encryption.

metaschima · 08-28-2015, 10:19 PM

What does 'file' say when you run it on the file ? Without knowing the file structure, it will be difficult to decrypt it. Try to find the program that created the file.

Filippo.rosa · 08-29-2015, 02:31 AM

I don't understand what "what does 'file' say when you run it on the file ?" means

metaschima · 08-29-2015, 10:47 AM

Run:

Code:

file encrypted.bin

Filippo.rosa · 08-29-2015, 02:52 PM

Code:

$ file myfile 
myfile: data

John VV · 08-29-2015, 03:52 PM

what worked for a now dead operating system ( ubuntu8 ) from 7 years ago might NOT work on a current OS now

it would be like using a Windows XP guide on Windows 10
-- not likely to work --

this is an encrypted video ? right
with a password ? right

and NOT a video using a proprietary video format from 7 years ago ( also all the RAGE on naughty p06n sites 7 years ago )

so

this is a archive ? like in a password protected RAR file ( ALL THE RAGE 7 years ago ) ?????

if an encrypted archive ( with a password)

double click on it
a pop up asking for the password will pop up
or
cd into the folder and type in the name of the archive

Code:

cd /to/the/location/of/the/file
rar -x archive.rar

and the terminal will ask for the password

Filippo.rosa · 08-30-2015, 02:42 AM

hi,
no, it isn't rar file.
rar -x myfile, unrar -x myfile and archive manager do nothing.
the file properties say unknown type.

metaschima · 08-30-2015, 09:59 AM

The problem is that we do not know the file format, nor the method of encryption. How do you even know it is encrypted with AES-128 ? It could be just random data. The only thing you can do now is find out what program created it, or just blindly try to decrypt it with different settings.