What Are You Doing In My Swamp? [209 Solves]
Description
This challenge is like ogres, it has layers
Attachments: layers.jpg
Flag
TUCTF{OgRes_aRe_lIke_oniLns}
Solution
Tools: stegseek
$ file layers.jpg
layers.jpg: data
$ hd layers.jpg | head -1
00000000 00 00 00 e0 00 10 4a 46 49 46 00 01 01 00 00 01 |......JFIF......|
$ hd layers.jpg | tail -2
0000c950 00 14 51 45 00 7f 00 00 |..QE....|
0000c958
It looks like JPEG file, but the first 4 bytes and last 2 bytes of the file are filled with \x00. Fix it.
$ printf "\xff\xd8\xff\xe0" | dd conv=notrunc of=layers.jpg bs=1 seek=0
4+0 records in
4+0 records out
4 bytes copied, 0.000103813 s, 38.5 kB/s
$ printf "\xff\xd9" | dd conv=notrunc of=layers.jpg bs=1 seek=$((0x0000c956))
2+0 records in
2+0 records out
2 bytes copied, 0.000128065 s, 15.6 kB/s
$ hd layers.jpg | head -1
00000000 ff d8 ff e0 00 10 4a 46 49 46 00 01 01 00 00 01 |......JFIF......|
$ hd layers.jpg | tail -2
0000c950 00 14 51 45 00 7f ff d9 |..QE....|
0000c958
$ file layers.jpg
layers.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, density 1x1, segment length 16, baseline, precision 8, 465x455, components 3
Fixed layers.jpg is:
It's Atbash Cipher, but there is no cipher message at the moment.
$ stegseek layers.jpg
StegSeek 0.6 - https://github.com/RickdeJager/StegSeek
[i] Found passphrase: "layers"
[i] Original filename: "secret_message.txt".
[i] Extracting to "layers.jpg.out".
$ file layers.jpg.out
layers.jpg.out: ASCII text
$ cat layers.jpg.out
GFXGU{LtIvh_zIv_oRpv_lmrOmh}
######################################################################################
# #
# ,.--------._ #
# / ''. #
# ,' \ |"\ /\ /\ #
# /"| / \ |__" ( \\ // ) #
# "_"| / z#####z \ // \ \\ // / #
# \\ ##### ##------". \// \_\\||||//_/ #
# \\/-----\ / ". \ \/ _ _ \ #
# \| \ | ,,--.. \ \/|(O)(O)| #
# | ,.--._ \ ( | ## \) \ \/ | | #
# |( ## )/ \ `-....-// |///////////////_\/ \ / #
# '--'." \ \ // |____| #
# /' / ) --. \ || / \ #
# ,..| \.________/ `-.. \ \ \| \ 0 0 / #
# _,##/ | ,/ / \ \ \ \ U / \_//_/ #
# :###.- | ,/ / \ /' ""\ .\ ( / #
# /####| | (.___________,---',/ | |\=._____| |_/ #
# /#####| | \__|__|__|__|_,/ |####\ | || #
# /######\ \ \__________/ /#####| \ || #
# /|#######`. `\ /#######\ | || #
# /++\#########\ \ _,' _/#########\ | || #
# /++++|#########| \ .---.. ,/ ,'##########.\|_|| Donkey By #
# //++++|#########\. \. ,-/ ,'########,+++++\\_\\ Hard'96 #
# /++++++|##########\. '._ _,/ ,'######,''++++++++\ #
# |+++++++|###########| -----." _'#######' +++++++++++\ #
# |+++++++|############\. \\ // /#######/++++ S@yaN +++\ #
# ________________________\\___//______________________________________ #
# / ____________________________________________________________________) #
# / / _ _ #
# | | | | | | #
# \ \ | | _ ____ ____ | | _ #
# \ \ | || \ / ___) / _ ) | | / ) #
# _____) ) | | | | | | ( __ / | |< ( #
# (______/ |_| |_| |_| \_____) |_| \_) #
# 19.08.02 #
######################################################################################
TUCTF{OgRes_aRe_lIke_oniLns}