Newest functions Upload a function Leave a tip My account

There are 2,572 functions in this library.

Rot13 ( Text )

Easy ROT 13 encoding/decoding function. Uses Recursion.

  Average rating: 4.2 (34 votes) Log in to vote

Christian Jaeger contact: cjaeger @ www.fmforums.com Hannover, Germany

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/* ROT13 (Caesar-Cipher by 13 chars) is a cipher commonly used in Usenet postings. The term cipher itself might be a bit misleading: The ROT13-algorithm is based on a rotation of all alphabetic characters by 13. Speaking in computer terms the ASCII-values of the letters are incremented or decremented by 13. In addition to ROT13, ROT5 is often used to encrypt digits, which means that every digit is rotated by 5. The beauty of the ROT13 is that you can use the same formula to decrypt. This encryption method is found often on Usenet, and you can use it to hide somethings from your kids (if they are under 8 years of age) ;-) */ Let([ numbers="0123456789"; characters="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; firstChar=Left(text;1) ] ; If(Length(text) >0; Case( PatternCount(numbers; firstChar) >0; Middle(numbers&numbers;Position(numbers;firstChar;1;1)+5;1); PatternCount(characters; firstChar) >0; If( Exact(firstChar;Upper(firstChar)); Middle(characters&characters;Position(characters;firstChar;1;1)+13;1); Middle(Lower(characters&characters);Position(characters;firstChar;1;1)+13;1) ); // end if firstChar) //end Case & Rot13(Middle(Text;2;999999999999999)) ;"" ) // end if ) //end let Click to copy

ROT13 (Caesar-Cipher by 13 chars) is a cipher commonly used in Usenet postings. The term cipher itself might be a bit misleading: The ROT13-algorithm is based on a rotation of all alphabetic characters by 13. Speaking in computer terms the ASCII-values of the letters are incremented or decremented by 13.

In addition to ROT13, ROT5 is often used to encrypt digits, which means that every digit is rotated by 5.

The beauty of the ROT13 is that you can use the same formula to decrypt. This encryption method is found often on Usenet, and you can use it to hide somethings from your kids (if they are under 8 years of age) ;-)

 

Comments

Log in to post comments.

 

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

Support this website.

This library has been a free commmunity resource for FileMaker users and developers for 21 years. It receives no funding and has no advertisements. If it has helped you out, I'd really appreciate it if you could contribute whatever you think it's worth: