The standard cypher used in rec.humor is called "rot13."  Each
     letter is replaced by the letter 13 farther along in the alphabet
     (cycling around at the end).  Most systems have a built-in
     command to decrypt such articles; readnews and nn have the "D"
     command, emacs/gnus has the "^C^R" combination, rn has the "X" or
     "^X" commands, notes has "%" or "R", and VMS news has the
     read/rot13 command.  If your system doesn't have a program to
     encrypt and decrypt these, you can quickly create a shell script
     using "tr":
	tr A-Za-z N-ZA-Mn-za-m
     On some versions of UNIX, the "tr" command should be written as:
	tr "[a-m][n-z][A-M][N-Z]" "[n-z][a-m][N-Z][A-M]"

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