I know this is not secure, Please tell me some tips to make it secure. And i want to know when this programs runs, it makes a file by taking username, but the file is visible to everybody. any body can make this type of user file and can break the security. But what to do to make it secure.Originally Posted by gardhr
So what can i use for Enter Key (return Key). I used ASCII value of enter key.
How can I read into a buffer.
Yes, Its my main problem in this program. I don't know how to make a encrypted file. I searched on net, but didn't get any solution. Please tell me how to do it. Thanks memcpy.
Use '\n' for the character generated by the return key. It will work regardless of whether your system uses an ASCII character set or not.
There are many ways. One way is to use getc() in a loop, appending the return value each time to the end of a buffer. Another way involves using the fgets() function, which is more line oriented. Regardless of technique, you need to ensure your code prevents input going outside your allocated buffer. (i.e. don't try to write 10 characters to a buffer that is only 5 characters long).
You gave up too soon. Try googling for "file encryption library".
Generally, you don't create an encrypted file in any special way (unless the data, when encrypted, contains binary data which means you need to open the file in binary mode). You create a file as normal, and then encrypt the data before writing it to the file. To read an encrypted file, read from the file and feed the data through an appropriate decryption before using int.
Some encryption libraries may provide special functions for opening and closing files. But, apart from alignment of files with buffers, that is just window dressing over the basic mechanics.
Last edited by grumpy; 04-14-2012 at 10:18 PM.
Modern compilers to consider
Free Developer Tools - Visual Studio 2010 Express | Microsoft Visual Studio
smorgasbordet - Pelles C
Code::Blocks
In fact, download them all and see how you get on with each one.
One useful test to see if you've written a good program is to get it to compile and work using multiple compilers.
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.
