lsb隐写 python

LSB隐写是一种基于最低有效位（Least Significant Bit）的隐写术，可以将秘密信息隐藏在图像、音频或视频等媒体文件中。在Python中，可以使用Pillow库来实现LSB隐写。以下是一个简单的LSB隐写示例代码：

from PIL import Image

def encode_lsb(image_path, secret_message):
    img = Image.open(image_path)
    pixels = img.load()
    width, height = img.size

    bit_message = ''.join(format(ord(c), '08b') for c in secret_message) + '11111111'

    index = 0
    for y in range(height):
        for x in range(width):
            r, g, b = pixels[x, y]

            if index < len(bit_message):
                pixels[x, y] = (r & 254 | int(bit_message[index]), g, b)
                index += 1

    img.save('encoded.png')

def decode_lsb(image_path):
    img = Image.open(image_path)
    pixels = img.load()
    width, height = img.size

    bit_message = ''
    for y in range(height):
        for x in range(width):
            r, g, b = pixels[x, y]
            bit_message += str(r & 1)

    secret_message = ''
    for i in range(0, len(bit_message), 8):
        if bit_message[i:i+8] == '11111111':
            break
        else:
            secret_message += chr(int(bit_message[i:i+8], 2))

    return secret_message

其中，encode_lsb函数用于将秘密信息编码到图片中，decode_lsb函数用于从图片中解码出秘密信息。注意，在编码时需要在秘密信息末尾添加一个8位的结束标志。