File encryption is the science of writing the contents of a file in a secret code. the encryption program should work like a filter, reading the contents of one file, modifying the data into code, and then writing the code contents out to a second file. the second file will be a version of the first file, but written in a secret code. although there are complex encryption techniques, you should come up with a simple one of your own. for example, you could read the first file one character at a time and add 10 to the character code of each character before it is written to the second file.