Emoji analysis: Difference between revisions
Created page with "===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..." |
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[[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=== | ===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. | As a prank your friend modified the text they were supposed to give to you. Figure out a way to solve the substituted text. | ||
| Line 21: | Line 27: | ||
===Tools=== | ===Tools=== | ||
* | *[https://crypto.interactive-maths.com/frequency-analysis-breaking-the-code.html Frequency analysis] | ||
* | *[https://www.dcode.fr/book-cipher Book cipher] | ||
===Flag=== | ===Flag=== | ||
<code>LARGE PROGRAMS HAVE MORE INFORMATION</code> | <code>LARGE PROGRAMS HAVE MORE INFORMATION</code> | ||
===Links=== | ===Links=== | ||
*[[CTF Challenges | Back to CTF Challenges page]] | *[[CTF Challenges | Back to CTF Challenges page]] | ||
Latest revision as of 11:59, 17 October 2022
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
Flag
LARGE PROGRAMS HAVE MORE INFORMATION
