View source for Emoji analysis

[[File:Emoji-task+flag.PNG|thumb|Emoji task + flag]]
[[File:Emojis.PNG|thumb|Emojis]]
[[File:Replace-with-charracters.PNG|thumb|Emojis replaced with characters]]
[[File:Frequency-analysis.PNG|thumb|Frequency analysis]]
[[File:Book-cipher.PNG|thumb|Book cipher]]

===Description===
As a prank your friend modified the text they were supposed to give to you. Figure out a way to solve the substituted text.

PS! You also find a stiky note4 where was written the following numbers *32 54 80 46 155*

100pts
===Question===
Figure out how it was done and capture the flag.

===Solution===
When you open a webpage, you are greeted by a page with a very large number of smileys and a few letters such as M, C and U.
I first saved that webpage so that I can edit it better with a more powerful editor. 

I replaced all the emoticons with letters. Since some of the characters were already given I had to make sure that none of the smileys were replaced by previous characters. 
Next, I put the text into the frequency analysis program and started to change the characters, trying to see if the text would be somehow clearer. After a while of rotating the letters I got the right ones replaced and the text became readable. 

From the text itself I still have to find the right answer to the task and for this I used the book cipher decoding with the numbers given in the task.

After that I got the correct answer to the task.


===Tools===
*[https://crypto.interactive-maths.com/frequency-analysis-breaking-the-code.html Frequency analysis]
*[https://www.dcode.fr/book-cipher Book cipher]

===Flag===
<code>LARGE PROGRAMS HAVE MORE INFORMATION</code>
===Links===
*[[CTF Challenges | Back to CTF Challenges page]]