HideWAVinJPG

stegobox.codec.HideWAVinJPG

Bases: BaseCodec

This algorithm allows to conceal audio files inside png images, using a well known steganographic method: hide the data in the least significant bits of an image pixels. This produces little changes to the image that usually aren't noticed by just looking at the image.

• Created by: QiuYu
• Created time: 2022/10/17

Originally implemented in AmanKardam/Image-Steganography-Hiding-Audio-

Source code in stegobox/codec/hide_wavinjpg/hide_wavinjpg.py

class HideWAVinJPG(BaseCodec):
    """This algorithm allows to conceal audio files inside png images, using a well
    known steganographic method: hide the data in the least significant bits of an image
    pixels. This produces little changes to the image that usually aren't noticed by
    just looking at the image.

    * Created by: QiuYu
    * Created time: 2022/10/17

    Originally implemented in
    [AmanKardam/Image-Steganography-Hiding-Audio-](https://github.com/AmanKardam/Image-Steganography-Hiding-Audio-)
    """

    def __init__(self) -> None:
        super().__init__()
        self.img = ImageObj()
        self.conv = AudioObj()

    def encode(
        self, carrier: Image.Image, payload: tuple[np.ndarray, int]
    ) -> tuple[Image.Image, int]:
        """Encoder requires carrier image to be JPG and payload to be a WAV audio.

        Args:
            carrier: Carrier image in format JPG. Read with 'stegobox.io.image.read()'.
            payload: Payload (secret message) to be encoded.Payload in format WAV. Read
                with `stegobox.io.soundfile.read()`.

        Returns:
            Encoded image in format JPG with the payload embeded.
        """
        bits_array, payload_len = self.conv.wavtobits(payload)
        imgout = self.img.encode(carrier, bits_array)
        return imgout, payload_len

    def decode(self, _):
        raise NotImplementedError("This codec does not support decoding without length")

    def decode_with_length(
        self, carrier: Image.Image, payload_len: int
    ) -> tuple[np.ndarray, int]:
        """Decode the secret payload from the carrier image.

        Args:
            carrier: Encoded carrier image.
            payload_len: The length of secret message

        Returns:
            The decoded payload (secret message).
        """
        wavdata = self.img.decode(carrier, payload_len)
        data, samplerate = self.conv.bitstowav(wavdata)
        return data, samplerate

encode(carrier, payload)

Encoder requires carrier image to be JPG and payload to be a WAV audio.

Parameters:

Name	Type	Description	Default
carrier	Image	Carrier image in format JPG. Read with 'stegobox.io.image.read()'.	required
payload	tuple[ndarray, int]	Payload (secret message) to be encoded.Payload in format WAV. Read with stegobox.io.soundfile.read().	required

Returns:

Type	Description
tuple[Image, int]	Encoded image in format JPG with the payload embeded.

Source code in stegobox/codec/hide_wavinjpg/hide_wavinjpg.py

def encode(
    self, carrier: Image.Image, payload: tuple[np.ndarray, int]
) -> tuple[Image.Image, int]:
    """Encoder requires carrier image to be JPG and payload to be a WAV audio.

    Args:
        carrier: Carrier image in format JPG. Read with 'stegobox.io.image.read()'.
        payload: Payload (secret message) to be encoded.Payload in format WAV. Read
            with `stegobox.io.soundfile.read()`.

    Returns:
        Encoded image in format JPG with the payload embeded.
    """
    bits_array, payload_len = self.conv.wavtobits(payload)
    imgout = self.img.encode(carrier, bits_array)
    return imgout, payload_len

decode_with_length(carrier, payload_len)

Decode the secret payload from the carrier image.

Parameters:

Name	Type	Description	Default
carrier	Image	Encoded carrier image.	required
payload_len	int	The length of secret message	required

Returns:

Type	Description
tuple[ndarray, int]	The decoded payload (secret message).

Source code in stegobox/codec/hide_wavinjpg/hide_wavinjpg.py

def decode_with_length(
    self, carrier: Image.Image, payload_len: int
) -> tuple[np.ndarray, int]:
    """Decode the secret payload from the carrier image.

    Args:
        carrier: Encoded carrier image.
        payload_len: The length of secret message

    Returns:
        The decoded payload (secret message).
    """
    wavdata = self.img.decode(carrier, payload_len)
    data, samplerate = self.conv.bitstowav(wavdata)
    return data, samplerate