Difference between revisions of "ROT13"

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'''Rot13''', also '''ROT13''' or '''ROT-13''', stands for "'''Rot'''ate by '''13''' places."  It is a simple way of obscuring text by replacing the actual character with the one that is thirteen characters following it in the English alphabet.
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[[Wikipedia:ROT13|ROT13 on wikipedia]].
  
For example, A is replaced with N, B with O, etc..
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''The wikipedia article above can provide you with all the details and mathematics about ROT13, here is why it relates to geocaching.''
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ROT13 is a simple cipher used to obscure geocache hints in a way that allows a determined person to decode the hint if they want to, but makes it impossible to "accidently" read the hint (and spoil your fun).  ROT-13 can be decoded by hand with just a pencil rather quickly.  Here is the key:
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When you ROT-13 a message, you simply replace each letter in the message with the letter that occurs 13 spaces ''after'' it in the alphabet.  If you reach Z, start over at A.  Imagine a wheel with the alphabet printed around it.  To encode a letter, find that letter on the wheel, and then ''ROT''ate the wheel ''13'' spaces.  That's it.
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Of course you could ROT-1 a message if you wanted to, or any other number from 1 to 26, but 13 is special because it is half of 26, and therefore ROT-13 works to encode and decode messages as well.
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Example:  If you encoded a message with ROT-1, you would have to use ROT-25 to decode the message.  That's because on a 26-sided wheel, 25 is the same as -1.
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Likewise, encoding with ROT-2 would require ROT-24 to decode, ROT-3 and ROT-23.  But what about ROT-13?  It decodes itself!  This is simply because 13 is half of 26.  The fact that ROT-13 decodes itself makes it easy to setup one chart for encoding and decoding:
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<pre>
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A B C D E F G H I J K L M
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N O P Q R S T U V W X Y Z
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</pre>
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To encode or decode a letter, just find it on the chart and pick the letter above or below it as your coded letter.
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Many experienced geocachers have memorized this chart and can decode caching hints in a flash.

Revision as of 04:15, 22 May 2005

ROT13 on wikipedia.

The wikipedia article above can provide you with all the details and mathematics about ROT13, here is why it relates to geocaching.

ROT13 is a simple cipher used to obscure geocache hints in a way that allows a determined person to decode the hint if they want to, but makes it impossible to "accidently" read the hint (and spoil your fun). ROT-13 can be decoded by hand with just a pencil rather quickly. Here is the key:


A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

To encode or decode a letter, just find it on the chart and pick the letter above or below it as your coded letter.

Many experienced geocachers have memorized this chart and can decode caching hints in a flash.

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