Difference between revisions of "ROT13"

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[[Category:Guides]]
 
[[Category:Guides]]
[[Wikipedia:ROT13|ROT13 on wikipedia]].
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ROT13 is a simple cipher used to obscure geocache hints. Geocachers who want the hint can decrypt it fairly easily by hand, but it is more difficult for others to "accidently" read the hint (and spoil their fun).
  
''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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Here is the key for ROT13 encryption/decryption:
  
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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  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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To encrypt or decrypt a letter, just find it in the key and select the letter above or below it.
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===
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Ybbx va gur gerr
  
Example:  If you encoded a message with ROT-1, you would have to use ROT-25 to decode the messageThat's because on a 26-sided wheel, 25 is the same as -1.
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The first letter of this encrypted hint is '''Y''', which corresponds to '''L''' in the keySo we know that the hint starts with '''L''':
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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L
-->
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Ybbx va gur gerr
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The next two letters are '''bb''', and '''b''' corresponds to '''o'''. Then '''x''' corresponds to '''k''', and we have the first word of the hint:
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  Look
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  Ybbx va gur gerr
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We can decrypt the rest of the hint in the same manner:
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Look in the tree
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Ybbx va gur gerr
  
<pre>
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Many experienced geocachers have memorized the ROT13 key and can decrypt caching hints very quickly. Also, certain words (e.g., "magnetic") appear so frequently in caching hints that many experienced geocachers recognize them in their encoded form (e.g., "zntargvp").
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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== See Also ==
  
Many experienced geocachers have memorized this chart and can decode caching hints in a flash.
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* [[Wikipedia:ROT13|Wikipedia's ROT13 article]] provides further details about ROT13, apart from its use in geocaching.
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* [http://www.rot13.com ROT13.com] provides an online ROT13 encryption/decryption program.
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* [http://www.palmspot.com/software/detail/ps6968a_9879.html c1ph3r 1.3] is Palm OS freeware for Rot13 encryption/decryption, for reversing text, and for converting text to l33t speak.

Latest revision as of 16:25, 4 September 2008

ROT13 is a simple cipher used to obscure geocache hints. Geocachers who want the hint can decrypt it fairly easily by hand, but it is more difficult for others to "accidently" read the hint (and spoil their fun).

Here is the key for ROT13 encryption/decryption:

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 encrypt or decrypt a letter, just find it in the key and select the letter above or below it.

[edit] Example

Ybbx va gur gerr

The first letter of this encrypted hint is Y, which corresponds to L in the key. So we know that the hint starts with L:

L
Ybbx va gur gerr

The next two letters are bb, and b corresponds to o. Then x corresponds to k, and we have the first word of the hint:

Look
Ybbx va gur gerr

We can decrypt the rest of the hint in the same manner:

Look in the tree
Ybbx va gur gerr

Many experienced geocachers have memorized the ROT13 key and can decrypt caching hints very quickly. Also, certain words (e.g., "magnetic") appear so frequently in caching hints that many experienced geocachers recognize them in their encoded form (e.g., "zntargvp").

[edit] See Also

  • Wikipedia's ROT13 article provides further details about ROT13, apart from its use in geocaching.
  • ROT13.com provides an online ROT13 encryption/decryption program.
  • c1ph3r 1.3 is Palm OS freeware for Rot13 encryption/decryption, for reversing text, and for converting text to l33t speak.
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