File encryption is the science of writing the contents of a file in a secret cod

Question

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 a code, and then writing the coded 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.

Explanation / Answer

#include #include #include using namespace std; struct Encryptor { char operator()(char c) const { return c+10; } }; int main() { ifstream in("input.txt"); ofstream out("output.txt"); transform(istreambuf_iterator(in), istreambuf_iterator(), ostreambuf_iterator(out), Encryptor()); // or just bind1st(plus(), 10)); } sample run: $ cat input.txt abcdef 01234 $ ./test $ cat output.txt klmnop:;

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