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 Forum index » Archive » Archive: Catching the Wish (CTW2) » CTW2: Quick Ref, Questions, and Meta
[INFO]A Lesson in Binary Decoding
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Sylvia
I Have No Life

Joined: 21 Apr 2006
Posts: 2062

 		[INFO]A Lesson in Binary Decoding
Now for a little bit about binary code, in case anyone would like to know more.
First here is a good base converter courtesy of Rogi http://rogi.ocnorb.googlepages.com/BaseConverter.HTML
And here is a good ASCII table http://www.neurophys.wisc.edu/www/comp/docs/ascii.html
Or this one if you only need a binary / octal / hex to text converter http://nickciske.com/tools/binary.php
But, if your unfamilar with how this works, the first two are great learning tools. They were good refesher tools for me since I haven't done this stuff in years and had forgotten most everything but the basics.
I'll break down the code from mystes.com/alchemical which got archetypal.
Quote:
01100001011100100110001101101000011001010111010001111001011100000110000101101100

First break the numbers down into groups of 8 unless you use this http://nickciske.com/tools/binary.php if so leave it the way it is.
Quote:
01100001
01110010
01100011
01101000
01100101
01110100
01111001
01110000
01100001
01101100

Next using Rogi's Base Converter, put the the number into the entry box label 2 then click on any other box and the number is automatically converted for you. Next look at the box labeled 10 and read the number that appears in it and then go to the ASCII table and look that number up in the first column when you find it reading across you will find the associated letter of the alphabet for that number. Of course you don't have to use the base converter for this you could just use the ASCII table and use your browser's find function to look up the string of 0s and 1s for you. But I think getting familiar with the base converter could come in handy for more difficult puzzles. You could also however, use this http://nickciske.com/tools/binary.php and enter the hole string of 0s and 1s and decode to text in one step which is good if you only want to know what the text is and nothing more.
Anyway here is how the numbers above become letters:
Quote:
--Binary ---------Decimal---- Octal----- Hex------- Value
01100001---------097----------141------061---------a
01110010---------114----------162------072---------r
01100011---------099----------143------063---------c
01101000---------104----------150------068---------h
01100101---------101----------145------065---------e
01110100---------116----------164 -----074---------t
01111001---------121----------171------079---------y
01110000---------112----------160------070---------p
01100001---------097----------141------061---------a
01101100---------108----------154------06C---------l


Rogi, I hope you don't care for me posting your base converter here. I was going to ask you on chat first but I got tired of waiting for you to get on, so I assumed you wouldn't care.
If you do, I'll remove it. Oh, do you think you could add a couple of features to it?

1. Add that fibonacci sequence thing and
2. It would also be nice if the values (0-9, A-Z and a-z) of the base 2 could be display to the right of that input box.

These would be cool.

PostPosted: Sat Aug 26, 2006 4:49 am
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Rogi Ocnorb
I Have 100 Cats and Smell of Wee


Joined: 01 Sep 2005
Posts: 4266
Location: Where the cheese is free.

 		No problem with anyone using the tool. Use it, abuse it, tweak it, whatever.
I mostly wanted it for quickly checking to see if a puzzle might be based on base conversion. Like, if you got the binary string
10111000000101010110001111101110111100000101110110
Which would produce gibberish in ASCII.

As it's looking at the string entered as a single numeric value, there wouldn't be much of a benefit putting the ASCII representation in the tool.
Incidentally, the above string is very near the upper limit of what Javascript can handle. Much bigger and it starts producing errors. (Somewhere around 70 trillion)

What do you mean about the Fibonacci?
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PostPosted: Sat Aug 26, 2006 5:51 am
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Sylvia
I Have No Life

Joined: 21 Apr 2006
Posts: 2062
Rogi wrote:
What do you mean about the Fibonacci?


Something to help solve problems like this:

http://forums.unfiction.com/forums/viewtopic.php?p=254357#254357

PostPosted: Sat Aug 26, 2006 6:20 am
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