Stenography

Name
Email
Subject
Comment *
File	Select/drop/paste files here
* = required field	[▶ Show post options & limits] Confused? See the FAQ.

Flag
Embed	(replaces files and can be used instead)
Options	Do not bump (you can also write sage in the email field) Spoiler images (this replaces the thumbnails of your images with question marks)
Password	(For file and post deletion.)
Allowed file types:jpg, jpeg, gif, png, webm, mp4, swf, pdf Max filesize is 8 MB. Max image dimensions are 10000 x 10000. You may upload 5 per post.

File: 1445745400531.jpg (177.93 KB, 611x600, 611:600, 611px-Cbp.jpg)

Stenography User 10/25/15 (Sun) 03:56:40 No.35886

>inspired by dank cyberpunk hacking theme

>download 3586 files from /cyber/

>find only 2 hidden ZIP archives

>1. LAINZINE #1

>2. worthless joke

For LAINZINE #2, the OP of that thread fucked up and didn't have the PDF in there, they had to link it further in the thread. That was disappointing.

So far I have just looked for hidden ZIP files, not for hidden text as seen in this example:

http://www.wikihow.com/Hide-Text-Within-an-Image

I haven't written a bash script to look for hidden text yet. I'll give that a try and see what comes up. If I come across encrypted text I currently don't have any tools for decryption, and depending on the type of encryption it would be foolish of me to try to break it with my equipment, which is not that powerful. It also occurred to me that one could use stenography to encode a message in the pixels based on certain shades at various XY positions, such that it would not stand out as being obvious in the image to the casual observer.

If you anons can show me anything that I missed, help me level up, etc., that would be great. Otherwise let this be a general stenography thread and I will post techniques as I progress.

btw, worthless joke is as follows:

>Friend has desktop

>Friend has cat

>Friend's desktop starts BSOD'ing consistently

>Figure it was cat hair, fan, overheat

>Get to friends house

>Hey anon, you start fixing the computer, I'll go get some chips and pop. What flavours you want?

>Head upstairs

>Begin dismanteling computer

>Pause

>Something is not right

>Look about

>Feel like I am being watched

>Keep working

>Fuck, why are these bolts stripped? Anon probably overclocked this shit

>Mangae to get it off

>Look inside

>Cat hair everywhere

>Scratch marks on compenents

>what the fuck

>Noise to the rear

>Turn around

>FUCKING SIAMESE CAT ATTACK

>Crash into computer

>Claws my face

>Pull it off

>Oh god my arms stop it

>Drop it

>Leave room

>Slam door

>friend comes home

>what happened anon

>Explain

>Dude, that's mitten's computer, he built it himself

>Mine is downstairs in the kitchen, I thought you'd like to work there better

Should've known after I saw the ricer mouse

User 10/25/15 (Sun) 04:00:01 No.35887

>>35886

>Should've known after I saw the ricer mouse

I fucking schway'd.

There was a DDT thread up a while back, but it appears to be ded. Embedded zip files are not the greatest stenography method, way too easy to detect.

User 10/25/15 (Sun) 04:07:32 No.35888

>>35887

>I fucking schway'd

jesus christ admin stop filtering k_e_k

User 10/25/15 (Sun) 15:19:39 No.35914

File: 1445786381028.png (504.25 KB, 696x658, 348:329, laughing bobbies.png)

>>35886

>Should've known after I saw the ricer mouse

goddamnit

User 10/25/15 (Sun) 20:00:16 No.35931

File: 1445803216849.png (925.99 KB, 768x4286, 384:2143, 1415673693889.png)

I was looking around and came across this as well.

https://www.lainchan.org/layer/index.html

DDT, anybody here ever use it?

I don't like the JavaScript, because JS is icky, but it is an interesting technique. (I think that from a principled perspective, anyone who loves software freedoms and privacy would not like JS very much.)

User 10/25/15 (Sun) 23:38:07 No.35953

>>35931

As I said already, we've had threads on it and used it before. 8ch might even have a board dedicated to it.

User 10/26/15 (Mon) 00:24:48 No.35956

File: 1445819088870.gif (533.7 KB, 500x281, 500:281, 1445652005294.gif)

>>35953

You did say that, mine was a stupid question. Found the board, thanks. I'll keep researching this sekrit stuff for the fun of it. Don't freak out if I come across your club, I'm not a moralfag or anything, just trying to level up my skillz. I have things that I want to keep private too. A dystopian future is already upon us, I'd like to communicate with friends in a more secure way.

User 10/27/15 (Tue) 12:09:11 No.36045

File: 1445947751835.png (64.42 KB, 128x128, 1:1, hidden1.png)

User 10/27/15 (Tue) 19:01:41 No.36052

>>36045

"Well done, you caught me red handed"

What I am looking for now is a way to scan files for data on either side of the image start/end marker, to recognize that there is extra data. Then I would like to take it further and sort into text messages (further sorted by plaintext where some words can be matched against a dictionary, versus encrypted) or recognize image or ZIP file formats automatically. I also heard a rumor that one might encode a hidden video or music track into a WEBM. This would be very shway to learn how to do.

User 10/27/15 (Tue) 20:08:50 No.36057

Just doing my research when I came across this page on "Best Tools to Perform Steganography". You may find it interesting if you want to be a skid. I'm still learning and I'd like to approach this from a computer science perspective, not to just be in a hurry to deploy a tool without any other concerns.

https://archive.is/vFlk0

User 10/27/15 (Tue) 20:23:39 No.36058

>>36045

I will explain the method.

Using GNU/Linux, in a given directory there are two files. We can create a new file "Message.png" that is a concatenation of the image file "1438184185845.png" and the ASCII text file "WewLads" using the following command in the console:

shazbot@gentoo:~ > cat 1438184185845.png WewLads > Message.png

Note: If you use > instead of >>, you will overwrite the destination file rather than add to it.

————————-

wew!

http://embeddedsw.net/OpenPuff_Steganography_Home.html

User 10/27/15 (Tue) 21:27:33 No.36060

>>36058

If you're a wincunt you can do this:

copy /B 1438184185845.png+WewLads.txt Message.png

or this

rename 1438184185845.png Message.png

type WewLads.txt>>Message.png

User 10/27/15 (Tue) 21:36:55 No.36063

>>36060

>being a wincunt

I think that to maintain any credibility we should avoid tutorials for Windows or OS X.

User 10/27/15 (Tue) 21:44:08 No.36066

>>36063

I need win for coagula, but I see what you are saying.

User 10/28/15 (Wed) 00:37:34 No.36082

>>36066

checked

I am not familiar with this software but consider making a partition and dual-booting. Its easier than you think and you can get Windows compatability for most programs with Wine. There is CentOS also, so there is no reason to feel trapped.

User 10/28/15 (Wed) 08:14:00 No.36098

It's an image synth.

I do dual-boot so I'll try wine.

User 10/28/15 (Wed) 14:10:05 No.36111

>>36098

That is what my initial research suggested but I couldn't image that it would be such an essential that you wouldn't make a GNU/Linux distro your daily driver. Is it really that schway? Maybe I should try it.

User 10/28/15 (Wed) 19:06:00 No.36119

File: 1446059160546.webm (6.56 MB, 1280x720, 16:9, my_body_is_ready.webm)

>>35886

>>2. worthless joke

>somone actually read my shitty example zip.png

Neat, I made that as an example to show some lusers how it's done.

>>36045

>>36052

The issue with catting text to the end, is that there's nothing to look for. With zip archives, it gives you a header, and you can use arbitrary file types, not just text

>I also heard a rumor that one might encode a hidden video or music track into a WEBM. This would be very shway to learn how to do.

You encode on a second track. Look up the -map option in ffmpeg. ~~Attached webm has a second track that can be heard by downloading and viewing with vlc or similar, and selecting the second track.~~

Fucking hotwheels, that is a valid webm. It seems 8chan won't accept webms with multiple tracks?

User 10/28/15 (Wed) 23:30:25 No.36132

>>36119

I am working on a way to look for appended text but it is going to take me a while. I am starting from low knowledge, although I can program. I intend to look for appended data outside the image format, and after I can do that I'll look for plain text in the least significant bits, using a dictonary cross-reference in English, but trying more languages could be fun too. After that, if appended data isn't an easily recognized file format then I assume its encrypted data. Trying to decrypt everything is another level. On my hardware it would take days to break anything other than simple substitution cyphers.

User 10/29/15 (Thu) 02:40:15 No.36150

>>36132

I imagine you could look for contiguous letter characters (including chink/gook/nip unicode and snowrunes) outside of the image format, including the various flavors of spaces, and determine from that alone. Otherwise you'll be defeated by simple ROT13.

User 10/29/15 (Thu) 06:57:06 No.36162

>>36132

I don't know about other file formats, but a .png has an ending header of

0000 0000 4549 444e 42ae 8260

in hex

I imagine most filetypes do, so all you have to do is look for the magic ending header

User 11/15/15 (Sun) 02:36:37 No.37052

>>36162

This is great but my programming skill is not great enough. I think I'll work on my C programming skills for a few months to figure this out.

User 11/16/15 (Mon) 01:16:36 No.37085

>>36119

What the fuck was that? Which anime?

User 11/18/15 (Wed) 08:50:46 No.37169

>>35886

'Stenography' What you mean is Steganography, cunt, the definition of stenography is: Stenography is a form of shorthand typing done on a special machine which makes it possible to produce simultaneously a verbatim transcript, for instance in courts. Stenographers also work alongside respeakers to produce live subtitles for TV.Oct 7, 2012

User 11/18/15 (Wed) 13:42:35 No.37176

>>35886

http://www.merriam-webster.com/dictionary/stenography

http://www.merriam-webster.com/dictionary/steganography