Answer:
Steganography
Explanation:
Steganography
This technique involves hiding the message being transferred between the sender and the recipient.
1. The message is hidden by converting the original message into covered or hidden writing. This is done using the key like in cryptography.
2. This hidden message is placed on the medium through which communication takes place. The medium is called as the carrier.
3. The key along with the covered message is also placed on the carrier. The recipient should receive both the message and the key.
Steganography can also be described as hiding the secret message inside an ordinary message. The key is used to unlock the secret message.
This process makes the actual message hidden for the naked eye.
Only the actual message is hidden, not the fact that the messages are being exchanged between the two parties.
The purpose of this technique is that the actual message should be viewed and understood by the sender and the recipient only.
Any third party should not be able to view and/ or understand the communication taking place even if the communication becomes accessible to any third party.
Unlike cryptography, the hidden message should not gain any attention of other parties involved.
Cryptography
This is different from cryptography. In cryptography, the actual message is converted into some other form called cipher text. The cipher text is not hidden between other messages; it is visible to the third party that the cipher text is being communicated.
Steganography techniques are applicable to all kinds of messages including text, audio, video and also images.
Uses
Steganography plays a vital role in preventing pirated copyright materials and also prevents unauthorized viewing of the material.
Techniques
1. Hash marking - The message is written in letters which also includes hash marks.
2. Watermarking - This technique includes hiding the copyrighted material between a collection of files. This gives additional protection to the material.
