bruteforce-salted-openssl(1)
NAME
bruteforce-salted-openssl - try to find the passphrase for files encrypted with OpenSSL
SYNOPSIS
bruteforce-salted-openssl [options] <filename>
DESCRIPTION
bruteforce-salted-openssl tries to find the passphrase or password of a
file that was encrypted with the openssl command. It can be used in two
ways:
* Try all the possible passwords given a charset.
* Try all the passwords in a file (dictionary).
bruteforce-salted-openssl has the following features:
* You can specify the number of threads to use when cracking a
file.
* The program should be able to use all the digests and
symmetric ciphers available with the OpenSSL libraries
installed on your system.
* Sending a USR1 signal to a running bruteforce-salted-openssl
process makes it print progress and continue.
* There are an exhaustive mode and a dictionary mode.
In the exhaustive mode the program tries to decrypt the file by trying
all possible passwords. It is especially useful if you know something
about the password (i.e. you forgot a part of your password but still
remember most of it). Finding the password of the file without knowing
anything about it would take way too much time (unless the password is
really short and/or weak). There are some command line options to
specify:
* The minimum password length to try.
* The maximum password length to try.
* The beginning of the password.
* The end of the password.
* The character set to use (among the characters of the current
locale).
In dictionary mode the program tries to decrypt the file by trying all
the passwords contained in a file. The file must have one password per
line.
OPTIONS
-1 Stop the program after finding the first password candidate.
-a List the available cipher and digest algorithms.
-B <file>
Search using binary passwords (instead of character passwords).
Write candidates to <file>.
-b <string>
Beginning of the password. The default value is "".
-c <cipher>
Cipher for decryption. The default value is aes-256-cbc.
-d <digest>
Digest for key and initialization vector generation. Default:
md5.
-e <string>
End of the password. Default: "".
-f <file>
Read the passwords from a file instead of generating them.
-h Show help and quit.
-L <n> Limit the maximum number of tested passwords to <n>.
-l <length>
Minimum password length (beginning and end included). Default:
1.
-M <string>
Consider the decryption as successful when the data starts with
<string>. Without this option, the decryption is considered as
successful when the data contains mostly printable ASCII
characters (at least 90%).
-m <length>
Maximum password length (beginning and end included). Default:
8.
-N Ignore decryption errors (similar to openssl -nopad).
-p <n> Print a message every <n> passwords tested.
-s <string>
Password character set. Default value is
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
-t <n> Number of threads to use. Default: 1.
Note: Sending a USR1 signal to a running bruteforce-salted-openssl
process makes it print progress info to standard error and continue.
LIMITATIONS
The program considers decrypted data as correct if it is mainly composed of printable ASCII characters (at least 90%). If the file you want to decrypt doesn't contain plain text, you will have to either use the -M option, or modify the 'valid_data' function in the source code to match your needs. If the file you want to decrypt is big, you should use the -N option on a truncated version of the file (to avoid decrypting the whole file with each password).
EXAMPLES
Try to find the password of an aes256 encrypted file using 4 threads,
trying only passwords with 5 characters:
$ bruteforce-salted-openssl -t 4 -l 5 -m 5 -c aes256 encrypted.file
Try to find the password of an aes256 encrypted file using 4 threads,
trying only passwords with 5 characters and print the password
currently tried every 100000 attempts:
$ bruteforce-salted-openssl -t 4 -l 5 -m 5 -c aes256 -p 100000 encrypted.file
Try to find the password of a des3 encrypted file using 8 threads,
trying only passwords with 9 to 11 characters, beginning with "AbCD",
ending with "Ef", and containing only letters:
$ bruteforce-salted-openssl -t 8 -l 9 -m 11 -c des3 -b "AbCD" -e "Ef" -s "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" encrypted.file
Try to find the password of an aes256 encrypted file using 6 threads,
trying the passwords contained in a dictionary file:
$ bruteforce-salted-openssl -t 6 -f dictionary.txt -c aes256 encrypted-file
Show the list of available algorithms:
$ bruteforce-salted-openssl -a
If the program finds a candidate password 'pwd', you can decrypt the
data using the 'openssl' command:
$ openssl enc -d -aes256 -salt -in encrypted.file -out decrypted.file -k pwd
DONATIONS
If you find this program useful and want to make a donation, you can send coins to one of the following addresses: * Peercoin: PWFNV1Cvq7nQBRyRueuYzwmDNXUGpgNkBC * Bitcoin: 1F1ZfM7XtggHsShK4vwuy9zv98a9wt7nXx
AUTHOR
bruteforce-salted-openssl was written by Guillaume LE VAILLANT. For contact, use the email <[email protected]> or go to https://github.com/glv2/bruteforce-salted-openssl. This manual page was written by Joao Eriberto Mota Filho <[email protected]> for the Debian project (but may be used by others).
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