This item contains an executable file. Please read the creator’s Read Me text file before utilizing, and proceed with caution. A standalone program that uses the ARC4 (or RC4) stream cipher to encrypt/decrypt a file. The program takes inputfile and prompts for a key. Then the program applies the cipher. The result is saved as outputfile. The file outputfile is overwritten if it already exists. The program has been written in C++ and the executable is compiled on Windows 7 using the GNU C++ compiler in MINGW [http://www.mingw.org/]. The program runs from a command prompt. View more information at https://math.ou.edu/~tmadsen/other.html.