This is a very easy question as google was enough to get the key 🙂
If you google the description you will get the following link https://archive.org/stream/Untangling_the_Web/Untangling_the_Web_djvu.txt
If you search for (Ctrl+F ————-> find) in the link for how much you will be knowing that all the references are taken from this link http://www.sims.berkelev.edu/research/proiects/how-much-%20info-2003/execsum.htm#summary
Unfortunately this web-page is not available now if you google for it you will get a link in www2 as http://www2.sims.berkeley.edu/research/projects/how-much-info-2003/execsum.htm
If you search for the IM (Instant messaging) you get it’s size is 274 Terabytes
The format of the flag is ASIS_md5(size)[which means that we need to find the md5sum of size and append “ASIS_” to it. Which results in the following flag. we can find the md5sum of any value in the terminal using the following command
echo -n 274 | md5sum
The -n flag is to mention echo no to give the newline, as echo by default gives the newline “n” as the newline at the endof 274 changes the md5 sum so we should not forget it 🙂
ASIS_d947bf06a885db0d477d707121934ff8
But later I found that the size of the instant messaging was directly in the link https://archive.org/stream/Untangling_the_Web/Untangling_the_Web_djvu.txt
I should have searched for instant messaging in the text file directly which I have later learned from other write-up
