Created
November 6, 2022 00:18
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Contoh Penerapan Steganografi Berbasis LSB
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% load citra dan ambil ukurannya (width dan height) | |
cover_img = imread("https://picsum.photos/512/512"); | |
[img_height, img_width] = size(cover_img); | |
pesan = "aku sangat ingin terbang"; | |
panjang_pesan = length(pesan) * 8; | |
% menggunakan fungsi uint8 untuk mengambil ascii | |
ascii_pesan = uint8(pesan); | |
% mengambil nilai biner dari pesan | |
biner_pesan = dec2bin(ascii_pesan, 8); | |
% mengubah biner_pesan ke dalam bentuk 1 baris | |
biner_pesan = transpose(biner_pesan); | |
biner_pesan = biner_pesan(:); | |
biner_pesan = str2num(biner_pesan); | |
% copy cover ke citra hasil | |
stego_img = cover_img; | |
% traverse cover img | |
counter = 1; | |
for x = 1:img_height | |
for y = 1:img_width | |
if (counter <= panjang_pesan) | |
LSB = bitget(cover_img(x, y), 1); | |
BPS = biner_pesan(counter); | |
temp = xor(LSB, BPS); | |
stego_img(x, y) = cover_img(x, y) + temp; | |
counter = counter + 1; | |
else | |
break; | |
end | |
end | |
end | |
% simpan gambar | |
imwrite(stego_img, 'stego.png'); |
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