What is steganography and its types?
It comes from the Greek words steganos, which means “covered” or “hidden,” and graph, which means “to write.” Hence, “hidden writing.” You can use steganography to hide text, video, images, or even audio data. It’s a helpful bit of knowledge, limited only by the type of medium and the author’s imagination.
What are the two types of steganalysis techniques?
Steganalysis can be broadly classified into two classes: signature steganalysis and statistical steganalysis. The division is based on whether the signature of the steganography technique or the statistics of image is used to identify the presence of concealed messages in images embedded using steganography.
Which algorithm is used in steganography?
The steganographic algorithm uses one public key and one private key to generate a binary sequence of pseudorandom numbers that indicate where the elements of the binary sequence of a secret message will be inserted. The insertion takes eventually place at the first seven AC coefficients in the transformed DCT domain.
What are the methods of steganalysis?
Steganalysis methods
- Stego-only attack: Only the stego-object is available for analysis.
- Known cover attack: The stego-object as well as the original medium is available.
- Known message attack: The hidden message and the corresponding stego-image are known.
What is the difference between steganography and cryptography?
The steganography and cryptography are the two sides of a coin where the steganography hides the traces of communication while cryptography uses encryption to make the message incomprehensible. The steganography does not employ changes in the structure of the message.
What are the mechanism involved in steganography?
embedding process is organized as follows, read the secret message character by character, randomize posi- tions at the end of two generated cover characters, create words from the generated cover characters, generate error detection code, and finally hide the generated key.
What is the most common way of steganography?
Today, digital steganography is the most common way of concealing information from third parties. Embedding messages within image files on a system is a widespread steganography technique.
What are the applications of steganography?
Applications of Steganography.
What are the features of steganography?
In steganography, the message to be hidden inside the cover–media must consider the following features.
- Hiding Capacity: This feature deals with the size of information that can be hidden inside the cover file.
- Perceptual Transparency: Perceptual transparency is an important feature of steganography.
What are the advantages of steganography?
The advantage of steganography, over cryptography alone, is that messages do not attract attention to themselves. Plainly visible encrypted messages—no matter how unbreakable—will arouse suspicion, and may in themselves be incriminating in countries where encryption is illegal.
What are limitations of steganography?
One of steganography’s disadvantages is that there is large overhead to hide very tiny amounts of information. Hiding short messages within wide text is limited by the size of the extensive text. Text files cleanly aren’t big enough to cover more complex data like images or audio files.