The term steganography refers to a type of hidden communication method in which a message is hidden within another format, such as a picture, without the recipient being aware of the fact that the message is being hidden. It is common for a steganography technique to encrypt a secret message by changing the smallest bit in every pixel in a picture. The term LSB steganography is used to refer to the technique of steganography based on the Least Significant Bits.
Digital images are made up of pixels that contain eight bits each, which correspond to the red, green, and blue color components that make up each pixel.These bits are responsible for determining the color and brightness of the pixel. We may encode a concealed message in a picture by changing the least significant bit during the encoding process. We can accomplish this without unpleasantly altering the image’s look by changing the least significant bit during the encoding process. For instance, consider the case that a picture has the binary value 10110101 representing the red component of each pixel. Using the least significant bit to encode our message, we are able to encode the red component of our message to 10110100 whilst not dramatically changing the pixel’s color. This procedure may have to be repeated for each pixel in the picture in order for us to encrypt our complete message. In addition, it should be noted that the size of the image limits the size of the message that is concealed. More pixels and larger pictures offer more room for message encoding.
COPILOT
PROMPT: summarize how steganography can be used to hide text in an image by modifying the least significant bit
FULL TEXT RETURNED:
- Concept:
- Steganography conceals information within seemingly innocuous data (like images).
- LSB-Steganography focuses on modifying the least significant bit of image pixels.
- Process:
- Take an image.
- Replace the LSB of each pixel with corresponding bits from the hidden message.
- Modify only the first rightmost bit to avoid noticeable changes in the image.
- If the message is large, modify subsequent bits.
- Steps:
- Encrypt the message for confidentiality.
- Upload the encrypted message to a server.
- Prepare the image using LSB-Steganography tools.
- Extract the hidden message using the same tools.
Remember, this technique allows secret communication while maintaining the image’s appearance!
PROMPT:
Certainly! Here’s a concise summary of steganography tools:
- Steganography Software Tools:
- These tools allow users to embed hidden data within a carrier file (such as an image or video) and later extract that data.
- Unlike encryption, it is not necessary to modify the original file, making detection difficult.
- The hidden message remains concealed within the carrier, allowing covert communication without altering the file itself.
- Types of Steganography:
- Text Steganography:
- Involves secretly storing information within text files.
- Hidden data is encoded into individual letters of words.
- Image Steganography:
- Conceals data using an image as a cover.
- Pixel intensities play a key role in data concealment.
- Terms include:
- Cover-Image: The unique picture that conceals data.
- Message: The real data masked within images (can be text or another image).
- Stego-Image: An image with a hidden message.
- Stego-Key: Used to embed or derive messages from cover images and stego-images
- Text Steganography:
Remember, steganography tools enable covert communication while maintaining the appearance of the carrier!
For this post, about 100% of explanation of steganography came from class notes, zoom recordings, outside sources, and steganography video on bridges/YouTube.
