CAESAR
Caesar Shift Ciphers

CAESAR is a FORTRAN90 library which can apply a Caesar shift cipher to a string of text.

Licensing:

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

Languages:

CAESAR 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.

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

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

ROT13, a FORTRAN90 library which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.

Source Code:

• caesar.f90, the source code.

Examples and Tests:

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

List of Routines:

• I4_MODP returns the nonnegative remainder of I4 division.
• S_TO_CAESAR applies a Caesar shift cipher to a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

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