MATLAB: Best image encryption algorithm

image encryption

What is the best algorithm for image encryption that can be coded in matlab?

Best Answer

This depends on what you mean by "best": fastest? minimal memory usage? hardest to decrypt by brute force? smallest implementation? most tolerant to types of input? most compatible to other applications?

You can implement all known encryption methods in Matlab. I prefer AES, see: FEX: CryptAES.

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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: Simple Matlab Code For Image Encryption and Decryption.

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

Best Answer

Related Solutions

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

MATLAB: Simple Matlab Code For Image Encryption and Decryption.

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