MATLAB: Simple Matlab Code For Image Encryption and Decryption.

decryptionencryptionimage

Can someone please post a simple matlab code for image encryption/decryption. Its urgent. Thank you. 🙂

Best Answer

I'm guessing you did not do a search of the File Exchange or you would not be asking this. Please click on this link: http://www.mathworks.com/matlabcentral/fileexchange/index?utf8=%E2%9C%93&term=encryption

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MATLAB: The encryption doesn’t work correctly? (SHA-256, HMAC-SHA-512)

Your call of DataHash creates the hash considering the class of the obejct. You want to get the hash for the values only.

challenge = 'c100b894-1729-464d-ace1-52dbce11db42';
Opt.Method  = 'SHA-256';
Opt.Input   = 'ascii';   % Use the contents only and only 8 bits
hash_digest = DataHash(challenge, Opt)
% Compare with:
DataHash(challenge, struct('Method','SHA-256'))
% Note that this considers the class and dimensions of the input also:
DataHash(challenge.', struct('Method','SHA-256'))
%                 ^^ other result for transposed input!!!

By the way, DataHash is an overkill here. Leaner:

Engine = java.security.MessageDigest.getInstance('SHA-256');
Engine.update(uint8(challenge(:)));
Hash   = typecast(Engine.digest, 'uint8')

And for HMAC:

BlockSize         = 128;         % 64 for: MD5, SHA-1, SHA-256
KeySize           = numel(Key);
Key               = uint8(Key);  % Hash it if it is longer than BlockSize
ipad(1:BlockSize) = uint8(54);   % 0x36
ipad(1:KeySize)   = bitxor(uint8(54), Key);
opad(1:BlockSize) = uint8(92);   % 0x5c
opad(1:KeySize)   = bitxor(uint8(92), Key);
Engine2 = java.security.MessageDigest.getInstance('SHA-512');
Engine2.update(ipad);
Engine2.update(uint8(Msg));
iHash = typecast(Engine2.digest, 'uint8');
Engine2.update(opad);
Engine2.update(iHash);
HMAC = typecast(Engine2.digest, 'uint8');

MATLAB: Unable to tweet from Matlab

According to this example, the base url to post tweet is

baseurl = 'https://api.twitter.com/1.1/statuses/update.json';

not the one you're using.

I don't have the datafeed toolbox (nor a twitter account) to test.

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Related Solutions

MATLAB: The encryption doesn’t work correctly? (SHA-256, HMAC-SHA-512)

MATLAB: Unable to tweet from Matlab

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