Advanced area of attack and defense world misc 3-11

3-11

The title gives a picture of a cat
use stegsolve open , It's a little bit late, but I didn't find anything
Have a look format, There are many different crc
Tried to modify the height , It doesn't work
to glance at data extract
Find out pk start
It's a compressed package
Click on save bin, Get the compressed package
decompression （ Prompt for damage , It doesn't matter , Still can get inside txt）

Copy flag.txt The string in
Found to be base64 encryption
Go to the online website to decrypt
Found to be base64 Image encryption
use CaptfEencoder Decrypt , Pay attention to adding data:image/jpeg;base64,

Software download address http://www.downza.cn/soft/273345.html
save as preservation
Get pictures
obtain flag

FLAG{
    LSB_i5_SO_EASY}

summary ：
lsb Steganography
Compressed file repair
base64 Picture steganography