What-Lies-Within

Point: 150

Category

Forensic

Question

Theres something in the building. Can you retrieve the flag?

Hint

There is data encoded somewhere, there might be an online decoder

Solution

This challenge relates to knowledge of the Least Significant Bit (LSB). It can be decompressed by zsteg.

m14ghost@m14ghost:~$ zsteg buildings.png 
b1,r,lsb,xy         .. text: "^5>R5YZrG"
b1,rgb,lsb,xy       .. text: "picoCTF{h1d1ng_1n_th3_b1t5}"
b1,abgr,msb,xy      .. file: PGP\011Secret Sub-key -
b2,b,lsb,xy         .. text: "XuH}p#8Iy="
b3,abgr,msb,xy      .. text: "t@Wp-_tH_v\r"
b4,r,lsb,xy         .. text: "fdD\"\"\"\" "
b4,r,msb,xy         .. text: "%Q#gpSv0c05"
b4,g,lsb,xy         .. text: "fDfffDD\"\""
b4,g,msb,xy         .. text: "f\"fff\"\"DD"
b4,b,lsb,xy         .. text: "\"$BDDDDf"
b4,b,msb,xy         .. text: "wwBDDDfUU53w"
b4,rgb,msb,xy       .. text: "dUcv%F#A`"
b4,bgr,msb,xy       .. text: " V\"c7Ga4"
b4,abgr,msb,xy      .. text: "gOC_$_@o"

Flag

picoCTF{h1d1ng_1n_th3_b1t5}