Review of vital techniques for hiding confidential data using image steganography

The quick advancement in the exchange of information through internet made it easier to exchange information exact and faster to the receiver. Security of data is one of the huge components of information technology and communication. Steganography is a term used for information hiding and it is an art of hidden writing. In steganography we hide information with a multimedia carrier i.e. image, text, audio, video files, etc. So, that observer cannot find the hidden information which we want to send to the receiver. Steganography main objective is to provide robustness, detectability, capacity of hidden data due to which it differs from other techniques such as watermarking and cryptography. This paper proposes a various technique used to hide information on image by an image steganography. In image steganography we hide our secret data in image so that the observer cannot feel its existence. Image steganography strategies are as of late been useful to send any secret message in the secured image carrier to anticipate threats and attacks, though it does not give any sort of opportunity to programmers to discover the secret technique. Image steganography is efficient and better type than other types of steganography. In image steganography data can be secured by the use of spatial and frequency domain. The difference in both is that in frequency domain first information is embedded in the changed picture rather than direct pixel and after that picture is transformed to spatial domain. There are many steganography algorithms in which each has its own advantages and limitations in terms of security and complexity. Critical analysis depends on the type of cover object used, domain of algorithm and imperative properties that are utilized as evaluative measures for Steganographic techniques.