rot13, a C code which reads a file and makes a copy in which all characters have been rotated by 13 positions, and all digits have been "rotated" by 5 positions.
Applying the code to the transformed file returns the original. Thus, ROT13 can be used as a very simply method of encoding and decoding text files. Only an idiot would be fooled by this encoding, but nonetheless the encoding serves a number of useful purposes. And often, it's only idiots you have to fool, after all.
rot13 file1.txtwhere
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rot13 is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
atbash, a C code which applies the Atbash substitution cipher to a string of text.
caesar, a C code which can apply a Caesar Shift Cipher to a string of text.
chrpak, a C code which works with characters and strings.
filum, a C code which performs various operations on files.
pig_latin, a C code which makes a copy of a file, translating the text into Pig Latin.
uudecode, a C code which reads a UU encoded text file and translates it back to its original form.
uuencode, a C code which translates a file (possibly in binary format) to the UU encoding.