Input: Stego-image I_s

Output: Message M

Initialization: Read I_s

Preprocessing of I_s :

Resize I_s to a square matrix of pixel values P_ij

Divide I_s into 8 × 8 blocks

Apply DCT in each block, P_uv

Generate an 8 × 8 quantization table, Q_t

Quantize each block by P_uv /Q_t and round them, Q_uv

Find DC values by Q_uv Q_uv((u*8)-7, (v*8)-7) and binarize

Extracting from LSB:

for each Q_uv

Extract the LSBs from Q_uv to find modified text, M_c

end for

Find cover image pixel values, C_ij

AES encrypted message, M_AES = C_ij ♁ M_c

Apply AES decryption on M_AES to get original message M