rarcrack - how long for the file with 400 MB ?

luckybc · 2014-12-26 06:11:27

Hi everyone

I'm trying to get the password in the encrypted file with 400 MB. It's more time I thought.

If someone have used the program, rarcrack, can you tell me know that get the password with special characters ?

For example:

The encrypted file with 400MB + the passwords "?_123_123_abc_@theworld".

How long for that ?

Thank you very much.

Last edited by luckybc (2014-12-26 06:29:07)

kevku · 2014-12-26 07:51:13

less than 12 parsecs

luckybc · 2014-12-26 07:58:13

Is it a joke ? ^_?

clfarron4 · 2014-12-26 11:54:52

Does rarcrack know how long the pass-phrase is or not?

Also, are you using a dictionary/removing obvious choices of pass-phrase to help speed up the process OR are you brute-forcing every single pass-phrase from the ASCII alpha-numeric alphabet + punctuation?

TL;DR: Assuming I've done the Maths correctly, a damn sight longer that you might have thought

Since you haven't said, I'm going to assume YES to the first question and I'm assuming you're brute forcing, to make the maths simpler.

For one character position you're looking at about 26 lower case + 26 upper case + 10 digits + 10 punctuation marks of some sort. So that's 72 characters. You've got 22 characters in the passphrase, so that's a potential of 72^22 = 7.26632672153 x 10^40 pass-phrase combinations.

Now let's assume you're doing this on modern hardware, with an SSD on a single machine which can process something at the rate of 200MB/s. That's two seconds a pass. That'll take you about 2.01842408931 x 10^37 hours.

Disclaimer: I'm working off the assumption that encryption has been used, and that rarcrack would decrypt the whole file on each attempt (pass-phrase protection and encryption are different things...). I don't actually know how it works, but for those that do know how it does, you can probably work out the time from the number of pass-phrase combinations.

Last edited by clfarron4 (2014-12-26 12:01:20)

defears · 2014-12-26 12:17:55

The size of the file doesn't matter. It's how many characters the password is. I've been going 6 months with one file that's only 295 bytes. I know the password is a combination of mine and the girlfriend's at the time because it's for our front door lock. Of course it's the one we both forgot.

If you open the xml file it generates you can put in what you think it started with. Or take out letters that you know are not in it to speed it up. Plus there is the --threads switch if you have a multi-core CPU.

On my quad-core it only does 23 passwords a second and is only on the 7th characters now after 6 months.

clfarron4 · 2014-12-26 12:29:10

defears wrote:

The size of the file doesn't matter. It's how many characters the password is. I've been going 6 months with one file that's only 295 bytes.
[snip]
On my quad-core it only does 23 passwords a second and is only on the 7th characters now after 6 months.

Not bad. Basically, OP has quite a bit of time to wait before it's done.

Last edited by clfarron4 (2014-12-26 12:30:34)

ewaller · 2014-12-26 16:54:38

kevku wrote:

less than 12 parsecs

Having a little trouble with our dimensional analysis are we?

satanselbow · 2014-12-26 18:20:04

ewaller wrote:

kevku wrote:
less than 12 parsecs
Having a little trouble with our dimensional analysis are we?

[blatant-xmas-troll]

Just... lol

[/blatant-xmas-troll]

luckybc · 2014-12-27 10:54:42

I'm so tired to try get the password from the file with 400 MB (It's very important datas).

Now I'm until try to use Crark & Rarcrack for that. I guess it maybe take me more than 7 days. The following is my steps and choices:

1) trying to guess the password from a-z (lower characters)
2) trying to guess the password from 0-9 (numbers)
3) trying to guess the password from a-z & 0-9 (1 +2)
4) trying to guess the password from A-Z
5) trying to guess the password from a-z & A-Z ( 4 + 5)
6) trying to guess the password from a-z & A-Z & 0-9 ( 1 + 2 + 4)
7) trying to guess the passsord from [~ + - . ^ ...] (special characters)
8) trying to guess the password from (1 + 2 + 4 + 7) Unkown time

If someone has GOOD IDEAS, can you tell me know

Thank you very much

Arch Linux

#1 2014-12-26 06:11:27

rarcrack - how long for the file with 400 MB ?

#2 2014-12-26 07:51:13

Re: rarcrack - how long for the file with 400 MB ?

#3 2014-12-26 07:58:13

Re: rarcrack - how long for the file with 400 MB ?

#4 2014-12-26 11:54:52

Re: rarcrack - how long for the file with 400 MB ?

#5 2014-12-26 12:17:55

Re: rarcrack - how long for the file with 400 MB ?

#6 2014-12-26 12:29:10

Re: rarcrack - how long for the file with 400 MB ?

#7 2014-12-26 16:54:38

Re: rarcrack - how long for the file with 400 MB ?

#8 2014-12-26 18:20:04

Re: rarcrack - how long for the file with 400 MB ?

#9 2014-12-27 10:54:42

Re: rarcrack - how long for the file with 400 MB ?

Board footer