C++ :: Â Decrypting And Encrypting Following A Certain Protocol?
Mar 26, 2014
I have a certain method of encrypting text. You get the first character of the word. For example in the word "hacker", you get 'h', and then you get the last character 'r'. The encrypted word until now is "hr". Then we get the same word with the 'h' and 'r' removed, now it's "acke". I do the same thing and get the first character 'a' and the last one 'e' and them to the encrypted word: it is now "hrae".
The left letters of the word are "ck", again we do the same thing and take the first character 'c' and the last character 'k' and and add them to the new encrypted word so it is "hraeck". The above word has an even number of characters and at the end had 2 characters left 'c' and 'k',first and last, in some cases of words with an odd number of characters, only one character is left! I'm completely lost on how to encrypt and decrypt this.
I'm very new to c and c++ and am currently working on a Caesar cipher that grabs encrypted text from a txt file and decrypts it onto a new txt file. My code builds fine in CodeBlocks and when I run it, there is a new txt file created but it stays blank.
#include <iostream> #include <fstream> #include <string> #include <stdlib.h> #include <cstdlib> using namespace std ; int main(int argc, char *argv[]){
I have managed to print out the encrypted text from the console, however it doesnt decrypt correctly and isn't returning the correct key. I can't seem to find the error that is causing the decrypted text from printing correctly. When I try to decrypt the text it changes it completely as well.
I am working on a program where a user first enters a key of 26 characters, they then choose the number of lines they'd like to use with a max length of 40. Once they have entered the key and chosen the number of lines, they then enter text into the chosen number of lines, before that text is ultimately encrypted. I have it working as far as accepting the user's 26-character key, accepting their choice for number of lines, but when the user is typing in their lines of text, it only allows 6 lines before it moves to where the text would be encrypted.
So this may be against the rules, not sure, grey area probably? However I just bought the PC game Oil Rush, and was having a look at how the assets are packed. As with most games the textures, scripts, sounds and audio are all free to access.
However the game data such as maps, models and other, are packed into UNG files, i.e a custom encrypted file format, which probably is also compressed. So I googled for an unpacker/extracter and found one which also comes with the C source. You can download here. [URL] ....
So I am trying to figure out how these authors work out this file format, from the source we have,
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#include<sys/types.h> #include<netinet/in.h> #include<netdb.h> #include<stdio.h>// for printf() and fprintf()
[Code]....
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Right now I'm working on an assignment where I need to take the data from on file encrypt it by adding 5 to each byte and then save it to a user specified location. I think I'm close to having it done but I've run into a hick up. After I get the user input for where the encrypted data should be saved the program seems to never end. This is the code I have so far
#include <iostream> #include <fstream> #include <string> using namespace std; int main() { ifstream input; ofstream output;
