Steganography relies on volatility in order to perform information hiding inside apparently innocuous payloads. Steganography helps in create secure communication between two parties, without any mediator noticing the presence of the particular communication. Steganalysis is the parallel to steganography. A steganalyst tries to find out the presence of a covert communication between two parties and either modify their communication. Many different techniques are introduced to make communication more secure by using steganography. All of them are proven to be secure in there own way. Many new techniques are coming in existence from past few years. In this paper, we review the different techniques that has already introduced.

Steganography, QR code, DWT, Bluetooth, Logistic Map , DNA

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