Encryption

[alagadmi]

Hey can any one of u guide me ? I have been assigned a project by my teacher to make a program in c++ which will be able to encrypt a text file, a .docx file or a pdf document !!! Encrypting a text file is easy i have already done that but how do i encrypt a docx file or a pdf file ???
Any advice or suggestion would be highly appreciated !!!

[Script Coder]

You would open them in binary form, and use your encryption method. Are you using XOR encryption or something more complex?

[alagadmi]

What's a XOR method ??? :(
Actually i am just using a key (for example 1) and adding it to the original data character by character !!!
I just wanna know one thing .............. I am currently opening it in binary form can u tell me how does the computer read the data in binary form, i just wanna get hold of the concept because according to my teacher i will have to use the hash encryption method to encrypt those files ................

So i have just broken them in parts first i wanna understand how i can encrypt a docx file and a pdf file using a simple program and then i would replace it by hash functions