Forensics – PastAAA

PastAAA - 350pts.

Challenge

This pasta is up to no good. There MUST be something behind it.https://2019shell1.picoctf.com/static/16d6023e39d418e4f0724ad318f1382c/ctf.png

Hints

no hints avaible

Solution

We need to find the flag inside the image and to find a way to extract it.
We discover that the technique used for the encoding of the flag is the LSB (least significant bit) system.
The message is hidden by micro-changes of the colors of the pixels.

To decode it we used the following passages:
1) upload the photo to an lsb decoding tool (they can be found easily online.

2) once the file is loaded, it is necessary to choose which level to modify the bits, at the beginning to low resolution image will appear. But when we increase the level of the resolution of the image we find the flag!

picoCTF{pa$ta_1s_lyf3}

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