# Notice me (forensics/stegano)
In the task we get some image drive (heavy one, so we won't upload it here), and hint that someone had secret data they removed.Binwalk says there is a PNG file and strings analysis shows that this PNG is close to `trash` strings.
We extract the image:
![](0.png)
Then we checked with stegsolve is maybe there is something hidden in the picture, and it turns out that LSB of the last data lines hides a link, to another image.They look identical, but the next image hides a different link.We assume this might be a long chain, so we've wrote a script to download the whole chain:
```pythonimport codecsimport requestsfrom crypto_commons.generic import chunk
def extract_link(data):    bits = []    for b, g, r, a in data:        lsb = b & 1        bits.append(lsb)    chunked_bytes = chunk(bits, 8)    integers = map(lambda x: int("".join(map(str, x)), 2), chunked_bytes)    full = "".join(map(chr, integers))    print(full[-100:])    return full[-23:]
def main():    from PIL import Image    index = 0    filename = "pngs/" + str(index) + ".png"    while True:        im = Image.open(filename)        data = im.getdata()        index += 1        new_link = extract_link(data)        print(new_link)        r = requests.get("http://" + new_link)        filename = "pngs/" + str(index) + ".png"        with codecs.open(filename, "wb") as output_file:            output_file.write(r.content)
main()```
It turns out it didn't take that long, already the 6th image is:
![](6.png)
And hides: `Flag{M1nD_4wAk3_b0DY_4sl33P}`