ROT13
ROT13 Character Cipher

ROT13 is a FORTRAN90 library which is given a string and applies the ROT13 cipher to characters and the ROT5 cipher to digits.

For example, we have:

        Input:                      Output:
 
        abcdefghijklmnopqrstuvwxyz  nopqrstuvwxyzabcdefghijklm
        Cher                        Pure
        James Thurston Howell       Wnzrf Guhefgba Ubjryy
        0123456789                  56789012345
      

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

ROT13 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Programs:

ATBASH, a FORTRAN90 library which applies the Atbash substitution cipher to a string of text.

CAESAR, a FORTRAN90 library which can apply a Caesar Shift Cipher to a string of text.

CHRPAK, a FORTRAN90 library which works with characters and strings.

FILUM, a FORTRAN90 library which can work with information in text files.

Source Code:

• rot13.f90, the source code.

Examples and Tests:

• rot13_test.f90, a sample calling program.
• rot13_test.txt, the output file.

List of Routines:

• CH_TO_ROT13 converts a character to its ROT13 equivalent.
• S_QUOTE "quotes" a string.
• S_TO_ROT13 "rotates" the alphabetical characters in a string by 13 positions.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN90 source codes.