MATLAB: How to convert an image for AES algorithm in Hexadecimal format input

aes algorithmbyte to hexadecimal conversioncryptographydata conversionimage to hexadecimal conversion

I know how to convert the file in byte format by using

fid = fopen(FileName, 'r');

if fid == -1, error('Cannot open file'); end

data = fread(fid, Inf, '*uint8');

fclose(fid);

But I want the file in hexadecimal format. How to convert it in hexadecimal format??? If I use dec2hex then the size of the file is too much so i cannot use this. So, how to convert file in hexadecimal for AES.

Plz… help….thanx.

Best Answer

datahex = sprintf('%02x', data);

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MATLAB: Bit-stream encryption using AES

Note that due to US laws, we are not able to discuss the implementation of AES in this forum. However, your question does not depend upon the implementation of AES, so it can be discussed.

You will need to pack your bits together into 8 bit bytes and encrypt the sequence of bytes; then unpack the sequence of encrypted bytes to form a sequence of bits.

ByteVector = bin2dec( char(reshape(BitVector, 8, []).' + '0') );

But first you have to pad BitVector out to a multiple of 8 bits.

Then you can encrypt ByteVector. Then afterwards

EncryptedBitVector = reshape( dec2bin( EncryptedByteVector, 8) .' - '0', 1, [])

This will almost certainly be longer than the original vector due to the way that AES works.

MATLAB: How to read hexadecimal/bcd format as double floating values

To achieve this, please follow the steps below:

1) Create a file with 'FF' written in BCD format:

str = ['FF'];
fileID = fopen('bcd.bin','w');
fwrite(fileID,hex2dec(str),'ubit16');
fclose(fileID);

2) First open the file and then read the data from that file:

fileID = fopen('bcd.bin');
onebyte = fread(fileID,1,'*ubit16')

3) You will see that "onebyte" is a variable of type "uint16" with a value of 255. To turn this into a MATLAB double, we can use the "double" function:

sol = double(onebyte) % this is 255.

Best Answer

Related Solutions

MATLAB: Bit-stream encryption using AES

MATLAB: How to read hexadecimal/bcd format as double floating values

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