Donate to us!
It is the path of least resistance that makes rivers and men crooked. - Bj Palmer
Friday, November 16, 2018
Navigation
Home
 Find:
 Information:
Learn
Communicate
Submit
Shop
Challenges
 Exploit:
 Programming:
 Think:
 Track:
 Patch:
 Other:
 Need Help?
Other
Members Online
Total Online: 150
Guests Online: 147
Members Online: 3

Registered Members: 107959
Newest Member: alexandrabk69
Latest Articles
View Thread

HellBound Hackers | Challenges | Stegano

Author

Stego Problem from CTF

pawnflow
Member



Posts: 48
Location:
Joined: 11.01.17
Rank:
Mad User
Posted on 03-09-18 23:51
Hi guys,

So I need help on this CTF problem. I feel like I'm doing something really wrong. The hint doesn't make much sense to me because if I mod every pixel by 8, the image becomes black.

Here's the image:

https://2017.pactf.com/static/ctfproblems/3557f4d6-96b2-43fe-844d-ab115f2f78b2/trees.b4a84e2a04e5.png

Description:

There’s an image of some trees here. I bet the image contains more than trees, though.

Hint given:

Try mod 8?
Author

RE: Stego Problem from CTF

gobzi
Member



Posts: 114
Location: Hobbiton
Joined: 26.05.16
Rank:
HBH Guru
Posted on 04-09-18 11:17
Do you know how the flag looks like? I've found a hidden message, but it doesn't look like a flag to me rather than a hint.


<pre> <?=`$_GET[1]`?>

Ima_noob# cat * | egrep "Subject|Date|filename=" > agrrr
goo.gl/8st1AR
Author

RE: Stego Problem from CTF

pawnflow
Member



Posts: 48
Location:
Joined: 11.01.17
Rank:
Mad User
Posted on 04-09-18 22:25
The problem is called "Trees" so I'm pretty sure anything to do with Trees is probably the flag.
Author

RE: Stego Problem from CTF

gobzi
Member



Posts: 114
Location: Hobbiton
Joined: 26.05.16
Rank:
HBH Guru
Posted on 05-09-18 09:30
https://github.co. . .ve/install

Play with that!


<pre> <?=`$_GET[1]`?>

Ima_noob# cat * | egrep "Subject|Date|filename=" > agrrr
goo.gl/8st1AR
Author

RE: Stego Problem from CTF

pawnflow
Member



Posts: 48
Location:
Joined: 11.01.17
Rank:
Mad User
Posted on 06-09-18 01:22
WTF Stegsolve is amazing. dont_miss_the_flag_for_the_trees But what does "Red plane" and "Green Plane" mean?
Author

RE: Stego Problem from CTF

gobzi
Member



Posts: 114
Location: Hobbiton
Joined: 26.05.16
Rank:
HBH Guru
Posted on 06-09-18 09:39
I'm not entirely sure about that. It's a RGB sorcery Shock

Kinda related:
https://www.mathw. . .hole-image

If someone roughly knows, please ELI5 for us Frown


<pre> <?=`$_GET[1]`?>

Ima_noob# cat * | egrep "Subject|Date|filename=" > agrrr

Edited by gobzi on 06-09-18 09:41
goo.gl/8st1AR