ALGORITHM 2: The extracted algorithm on the receiver side

Input: The input to this function will be a Stego Image.

Output: The decrypted Target Text Message from Stego Image will be produced.

Begin

1 Find the text message sizeSand setS1= S * 8, i.e., the bitstream size.

2 Take a blank bit string named extracted bits, such as M

3 Traverse through the Stego image

4 fori= 1 toheight

5 for j= 1 towidth

6 Ifmore message bits are remaining to be extracted

7 Find the Least Significant Bit of the current pixel using the hash function used on the sender side

8 SB1= mod (((i−1) * height+j), 13)

9 SB= mod (SB1,4)

10 Store the LSB of the pixel in bit string M

11 End

12 End

13 End

14 Get all the bits in 8 column table where each row is the bits of the character in the hidden text

15 Convert the extracted bits to characters by multiplying with powers of 2

16 Apply Caesar cipher or Vigenère cipher which one used on the sender side

17 Print the hidden text

18 End