Based

Information

Points	Category	Level
200	General Skills	Easy

Challenge

To get truly 1337, you must understand different data encodings, such as hexadecimal or binary. Can you get the flag from this program to prove you are on the way to becoming 1337? Connect with nc 2019shell1.picoctf.com 29594.

Hint

I hear python can convert things.It might help to have multiple windows open

Solution

Pay attention that this challenge change each time so it’s not exactly the solution for you, but it’s the same way to solve it.

So lets connect to the server with netcat to see what it is:

Open terminal -> nc 2019shell1.picoctf.com 29594

We can see this text:

Let us see how data is stored table Please give the 01110100 01100001 01100010 01101100 01100101 as a word. … you have 45 seconds….. Input:

and it’s wait for us to input a text from this binary number. So it’s one of the picoCTF nc quizzes, some of the solvers like to create a python script that parse the text and solve each level, but I think it’s just waste of time so I solve the levels manually.

So at the first level we need to convert binary base number to text, easy search in google found this site And we got: table

Now I got this message:

Please give me the 156 165 162 163 145 as a word. Input:

So it’s not a binary now, the common bases are (binary, octal, decimal, hex) so binary no maybe it’s octal, again easy search in google found this site And we got: nurse

Now the message is:

Please give me the 6c697a617264 as a word. Input:

So it’s not binary, not octal, not decimal so maybe it’s hex. Again easy search for hex to ascii and found this site And we got: lizard

And here is the flag!

Flag

picoCTF{learning_about_converting_values_e67b1990}

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