What is Steganography?

Steganography is the practice of concealing information. It involves hiding data within an ordinary, non-secret file or message to prevent detection. The hidden information is being extracted at the receiving end. Often, steganography is combined with encryption to add an extra layer of security for the hidden data. With the help of Steganography, we can hide any digital content virtually like text, image, videotape, etc.

The term "steganography" is derived from the Greek word "steganos" which means "hidden or covered" and "graph" means "to write." It has been in use for centuries. For example, in ancient Greece, people carved messages onto wood and covered them with wax to hide it. Similarly, Romans used different types of invisible inks which could be revealed when exposed to heat or light.

How Steganography Works

Step 1: The first step in steganography is selecting a cover medium which is the file or message that will carry the hidden data. Common cover media include:

• Images (JPEG, PNG, BMP, etc.)
• Audio files (MP3, WAV, etc.)
• Video files (MP4, AVI, etc.)
• Text files or documents

Step 2: Sometimes, before embedding, the secret message is encrypted to add an additional layer of security. This ensures that even if someone detects the hidden data, they cannot read it without the decryption key.

Step 3: The secret message is then hidden using one of several techniques:

• Least Significant Bit (LSB): The least significant bit of a byte is changed to hide the secret message. This method is often used in image and audio files.
• Frequency Domain: Instead of modifying the raw data (like pixels or audio samples), the secret message can be embedded in the frequency components of an image or audio file.
• Bit Planes: In this method, data is hidden in the higher-order bit planes of an image. This can be more secure because it uses bits that are less likely to be noticed.

The most common is Least Significant Bit (LSB) encoding.

Step 4: The modified data is then embedded into the cover medium. The resulting file which now contains both the cover data and the hidden message is referred to as the stego-object which can be safely transmitted or stored without raising suspicion.

Step 5: The receiver of the stego-object needs to know the method used for embedding the secret message. In some cases, a secret key is required to extract the data if encryption is used in combination with steganography.

Different Types of Steganography

Text Steganography

Text Steganography is defined as a type of steganography which involves caching dispatches or secret information within a textbook document or other textual data. In this system, we try to hide secret data with the help of each letter of the word. It is challenging to describe especially when the variations or changes made are subtle.

Image Steganography

Image Steganography is defined as a type of steganography which involves caching dispatches or secret information within digital images. It is achieved by making changes in the pixels of the image to render the information. It is generally used for watermarking, covert communication, brand protection, etc.

Audio Steganography

Audio Steganography is defined as a type of steganography which involves caching dispatches or secret information within audio lines. The ideal behind using this fashion is to hide information in such a way that people cannot notice it when they hear the audio. It's generally used for digital rights operation in audio lines.

Video Steganography

Video Steganography is defined as a type of steganography which involves caching dispatches or secret information within digital videotape lines. The ideal way to use Video Steganography is to detect secret information in a videotape in such a way that normal people won't notice it.

Network or Protocol Steganography

Network or Protocol Steganography is defined as a type of steganography which involves caching dispatches or secret information within network protocols or dispatches. It tries to hide secret information in the usual inflow of internet or network exertion so that nothing can describe it.

Advantages of Steganography

• It offers better security for data sharing and communication.
• It's veritably important delicate to descry. It can only be detected by the receiver party.
• It can apply through colorful means like images, audio, videotape, textbook,etc.
• It plays a vital part in securing the content of the communication.
• It offers double subcaste of protection, first being the train itself and second the data decoded.
• With the help of Steganography advanced functional agency can communicate intimately.

Difference between Steganography and Cryptography