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Data structure help needed!

Required function: void encrypt file(const std:string& filename, const std::string& password) You realized that someone else might see through your idea to "unzip" a file and determine it is not secure enough to transmit these files, so you thought encryption might be a better way to secure your pictures. To do some basic encryption, you have decided to take a password as an encryption key and then repeatedly XOR the file data with the password and write out this data as a new file. To accomplish this, we have to understand first how XOR works. The bitwise operation in C++ is computed using the A operator works on all primitive types. The XOR operation behaves as follows: Table 1: Truth table for XOR (source: http://www.cplusplus.com/doc/boolean/) 011 101 1 1 0