how can i hide a text message in the lsb plane of cover image?

how can i hide a text message in the lsb plane of cover image?

Answer 1

[George]

This File Exchange submission may do what you want.

[Sanjeeb Behera]

Hello Thank u for ur quick response. But here both are images. I want to hide a text in side lsb plane of cover image

[Walter Roberson]

text_bits = reshape( (dec2bin( uint8(TheStringToEmbed), 8 ) - '0').', 1, []);

Now text_bits is the stream of bits to embed.

Note: if the string contains any characters from non-English character sets, you might need to extend the 8 to 16. For example that would be needed if you tried to embed characters from the Cyrillic alphabet.

[Sanjeeb Behera]

The above code i have used in my program

text_bit=reshape((dec2bin( uint8(rsa(c1)), 8 ) - '0').', 1, []);
J=text_bit;

I1=J;

Here I1 is ist lsb plane of cover image

rsa(c1) conatains the encrypted text

it gives an error

Error in ==> Spatial_thesis at 13
text_bit=reshape((dec2bin( uint8(rsa1(c1)), 8 ) - '0').', 1, []);

[Walter Roberson]

Your error message refers to rsa1() but your code refers to rsa() .

Please post the complete error message.

Note: if rsa() or rsa1() have to do with encryption, then note that encryption functions seldom return plain strings that should be directly embedded. Encryption functions tend to return either vectors of uint8 directly, or else strings of hex digits.

If the function is returning a string of hex digits then you should first use

TheStringToEmbed = uint8( arrayfun(@hex2dec, rsa(c1)) );
text_bits = reshape( (dec2bin( uint8(TheStringToEmbed), 4 ) - '0').', 1, []);

[Sanjeeb Behera]

The following code executed

Embedstr=uint8(arrayfun(@hex2dec, rsa1(c1)));
text_bits=reshape((dec2bin(uint8(Embedstr), 4) - '0').', 1, []);
J=text_bits;
I1=J;
II=I8*128+I7*64+I6*32+I5*16+I4*8+I3*4+uint8(I2)*2+I1;

it gives an error as below

??? Undefined function or variable 'c1'.

Error in ==> Spatial_thesis at 14
Embedstr=uint8(arrayfun(@hex2dec, rsa1(c1)));

[Walter Roberson]

'c1' is your variable. You showed it in

text_bit=reshape((dec2bin( uint8(rsa(c1)), 8 ) - '0').', 1, []);

I have no idea where you are getting it from (or think you are getting it from.)

Answer 2

[Image Analyst]

See attached demo.

[Sanjeeb Behera]

Thank u for ur response. But this contains GUI and i need particular code that i have to used in my program.

[Image Analyst]

Comment out anything that calls imshow() then.