Managed C++/CLI

12-Feb-07 4:32

Hi all,
I am thinking to create an application of Cryptography and steganography. Its quite interesting topic but i am not much familiar with the logic behind it. Is there any one who knows much about it and could guide me any good book for this or any code which could be of my help.

Thanks

led mike12-Feb-07 4:42

led mike

12-Feb-07 4:42

JFGI[^]

led mike

User 58385212-Feb-07 11:27

User 583852

12-Feb-07 11:27

led mike wrote:
JFGI

System.IO.Path.IsPathRooted() does not behave as I would expect

Saravanan Somasundaram12-Feb-07 20:07

12-Feb-07 20:07

Hi,

Regarding cryptography, it is a very big topic.
Regarding steganography, the concept is pretty simple to explain. But implementation can take that to any level from simple to complex.

The concept behind steganography is, we hide the data within another multimedia content, which doesnt show off the variation with this hidden message.

To make it clear, consider hiding a simple test message "Hello World" inside a 24-Bit Bitmap Image.

A bitmap image contains, 3 portions(file header, bitmap header and the actual 24bit bitmap content). The 3rd part, the bitmap content, contains 3 bytes for each pixel in a image. Let us say we have a picture of size 5 X 5. This will have 25 pixels and hence 75(25 X 3) bytes.

The change in the Bit 1(Least Significant Bit), wont create much variation to the bitmap image. So we take this as the slot to hide our data. We split our data to hide into bits and store each bit in the LSB of the Bitmap data.

I have implemented a simple version of hiding the data using this concept. And also the data retrieval part in C++. It was a very interesting stuff to implement.

Thanks.

With Regards,
Saravanan Somasundaram

Software_Specialist13-Feb-07 1:22

13-Feb-07 1:22

Thanks for giving the info..
I want to create application supporting Jpeg and.mp3 as my project. Well could you guide me the right path to follow so that i could achieve that in 5 months time.
I am not a really good programmer at the moment but i am working hard for that. I cant do anything simpler than this. like not bitmaps or .wav . I have heard its bit easy as its losless where as .jpeg and .mp3 are not.

Is there any particular bok for Stego and Crypto with C++ from where i can gain information.

Thanks a lot.

Saravanan Somasundaram13-Feb-07 2:05

13-Feb-07 2:05

As far as i know, it is not possible to use JPEG for steganography. The reason is JPEG is a compressed form of a Bitmap and when we change the data present in JPEG, the reverse conversion(i.e JPEG to Bitmap) will be affected very much. That is the reason, we choose bitmap to hide the data.

Further, i am not much aware of the audio multimedia types. But i can refer to that and get back on that.

Well i could guide u on ur implementation of this module.

Thanks.

With Regards,
Saravanan Somasundaram

Software_Specialist13-Feb-07 2:59

13-Feb-07 2:59

I think its possible with .jpg as i could find many articles after googling it.
But i have to prepare my grounding before i start anything.
Your help would be greatly appreciated. I was just wondering if there are any books for stego n crypto with C++ so that i could understand what exactly is going at the background.
And how complicated do you think it would be. I dont want that after 2-3 months i feel that i picked up a wrong topic. Do you think Stego is more difficult or creating a game engine.

But first i think i would go for bitmap and .wav, after achieving that i can step further. So what would you suggest, from where should i start my work on it.

Thanks a lot...

Saravanan Somasundaram13-Feb-07 5:39

13-Feb-07 5:39

Please do not back out from this project. This is an excellent project. An excellent idea too. You have done a great job in choosing this.

About steganography books, i havent used any specific books just googled and got some info and applied the same. With steganography, there is nothing much to learn, we are going to hide the data, in some multimedia data. Just we need to learn the format of multimedia contents(image, audio). That i guess is easy to get from google.

And steganography is very easy to implement too. It took hardly 4 hours for me to implement that as a simple c code. Might be to put that in a GUI application it will take hardly 10 hours to implement.

So to start with you can read the Format of different multimedia types (Bitmap, WAV, etc). Then it is just a matter of finding least significant data portion in this multimedia contents, which can be used to hide our data.

So all the best in your effort. Please feel free to mail, if u need futher info.

Thanks.

With Regards,
Saravanan Somasundaram

Software_Specialist13-Feb-07 9:36

13-Feb-07 9:36

Thanks for encouraging me.
I think ill start up with this project. I am just revising C++ as i left C++ few months back. So within 10-12days i should get onto proper work for it.
Please provide me with your email id or mail me at anantnigam@hotmail.com so that i could be in your contact throughout this project and would take your guidance...

Thanks a lot

Saravanan Somasundaram13-Feb-07 17:41

13-Feb-07 17:41

My email id is ssomasundaram@gmail.com.
Please feel free to contact.

All the best for ur efforts.

With Regards,
Saravanan Somasundaram