how to display the encrypted image

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Hi,I am in need of sample program to display the encrypted image ,someone pls help me

This is the code for encryption.But I got a error like "key not valid for use in specified state"

C#

byte[] img = imagetobyte(pictureBox1.Image);
RSAParameters rsaPubParams;
RSAParameters rsaPrivateParams;
RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

//Generate public and private key data.
rsaPrivateParams = rsaCSP.ExportParameters(true);
rsaPubParams = rsaCSP.ExportParameters(false);
rsaCSP.ImportParameters(rsaPubParams);
byte[] output=new byte[13000000];
output = rsaCSP.Encrypt(img,false);
pictureBox2.Image = byteArrayToImage(output);

how to rectify it?

[Edit: Codehawkz]Added the user comments to the question itself[/edit]

Posted 19-Sep-12 20:38pm

prabhatsp

Updated 19-Sep-12 22:39pm

CodeHawkz

v2

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Kuthuparakkal 20-Sep-12 2:41am

need more info

prabhatsp 20-Sep-12 2:49am

I need the program which use image(flower something) as input , i want perform encryption process with key and image.Then I have to display the encrypted image(something like image full of dot,but something to be displayed) as output

prabhatsp 20-Sep-12 3:21am

The code using AES Encryption performs encryption ,but the image will not be displayed.

DaveAuld 20-Sep-12 2:41am

That is just a horrendous question. What encryoted image? What encryption scheme? What have you tried?

prabhatsp 20-Sep-12 2:49am

I need the program which use image(flower something) as input , i want perform encryption process with key and image.Then I have to display the encrypted image(something like image full of dot,but something to be displayed) as output

CodeHawkz 20-Sep-12 2:52am

Prabhat, let's imagine you make customized cages for animals. If i come and ask Hi, 'I am in need a cage to put my pet', what would you say? You'll first be like 'errm.. crazy guy' and ask 'what do you have for a pet? what is the size of it?' and so on. Because, without that it's impossible for you to come up with a cage with correct size. isn't it?

Likewise, we can't either. The other difference is, we are not doing a business here. So give us all the relevant information you got, so that we can help you. A few examples, explanation of the problem you faced, sample code, etc. would be really nice. Otherwise people wouldn't even bother to help you (even though I took this time to type all this hoping you'd learn how to explain a problem of yours to someone else).

How do you expect someone to know that image was encrypted using what method?

Please, improve your question

prabhatsp 20-Sep-12 3:01am

Mr.CodeHawkz,I use original image size of (120,120).I convert image to byte array.I use RSA encryption algorithm.This is the code for encryption.But I got a error like "key not valid for use in specified state"
byte[] img = imagetobyte(pictureBox1.Image);
RSAParameters rsaPubParams;
RSAParameters rsaPrivateParams;
RSACryptoServiceProvider rsaCSP = new RSACryptoServiceProvider();

//Generate public and private key data.
rsaPrivateParams = rsaCSP.ExportParameters(true);
rsaPubParams = rsaCSP.ExportParameters(false);
rsaCSP.ImportParameters(rsaPubParams);
byte[] output=new byte[13000000];
output = rsaCSP.Encrypt(img,false);
pictureBox2.Image = byteArrayToImage(output);
how to rectify it .

CodeHawkz 20-Sep-12 4:43am

Hi, I added this part of your question to the question itself. What you need to realize is that, an image is a certain format of bytes, not just some bytes. When you encrypt you destroy this format and it becomes a meaningless set of bytes. Therefore, you cannot display it, unless you decrypt back again

I get what you mean by an encrypted image. Let me get back to you on that :)

Regards

prabhatsp 20-Sep-12 5:35am

Hi,any concept related to displaying image encryption

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Richard Marshel · Answer 1 · 2012-10-01T22:10:00

If you do not know the encryption standard and the keys/passwords/etc. used to encode the original image, you will not be able to decrypt it without some serious hacking skills (and in many cases, it's not possible even with such skills).

There's a code sample in this forum that shows how to implement both encryptions and decryption in 2 small projects:
Encrypt and decrypt images

Mehdi Gholam · Answer 2 · 2012-09-19T20:42:00

Solution 1

To show an encrypted image first you must "decrypt" it to the original format.

For this you must know the encryption method and keys used.

The standard libraries in .net can show most image formats (png,jpg,gif etc.) without problems.

Posted 19-Sep-12 20:42pm

Mehdi Gholam

Comments

DaveAuld 20-Sep-12 2:55am

Reading his comments, I think he is talking more about image scrambling, as he wants to still be able to show a valid image of the encrypted input image.

Kuthuparakkal · Answer 3 · 2012-09-19T21:11:00

Solution 2

RSA can only encrypt data blocks that are shorter than the key length. Try AES and encrypt the data using a random key with AES and encrypt the random key with RSA key.

Posted 19-Sep-12 21:11pm

Kuthuparakkal

Comments

Kuthuparakkal 20-Sep-12 3:28am

I think you are confused with encryption and "the stuff" you would like to achieve. You either look for :
1. Image Distortion

OR
2. Scramble/De-scarmble stuffs.

http://www.codeforge.com/article/211089
http://en.wikipedia.org/wiki/Bilinear_interpolation

how to display the encrypted image

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