Let's say I have this code block right here:
That encrypts my ch. Now would this decrypt my ch (back to normal)?Code:ch = ch ^ Password; // Encrypting...
Because I was having trouble writing a program that takes a file and a key and then encrypts it, and then when the user specifies, decrypts it. It would encrypt the file, but never decrypt it.Code:ch = Password ^ ch; // Decrypting...
Thanks a bunch.
Well it looks OK so far...
Do you treat your files as text files or binary files?
You have to be careful with text files, exclusive-oring a char with itself gets you '\0', which is usually pretty bad in most string contexts
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
I believe I was treating them as text files unless I'm mistaken.
Could I treat the text file as a binary file, and then encrypt/decrypt it? If so, how?Code:fstream FileE(argv[1], ios::in | ios::out | ios::nocreate);
Trying to do input and output on the same file is trickier than normal. You have to keep using flush() and seek() to make sure you're reading and writing the correct data.
It's normally a lot easier to create a temp file, then do delete/rename
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
as salem was saying
>> if(ch !=pwd)
>> ch ^= pwd;
tho I think you would have to store the last value of the encryption and then work backwords to decrypt it. Is that right?
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
