• Aswathy Chandran B S
• Smitha Vas

In today’s modern world, the number of computer users and the rate of information exchange is growing exponentially. Hence the need for secure transmission of this information is also a relevant research topic. Two common approaches found in the literature so far for the secure transmission of information are cryptography and steganography. In steganography, no one except the sender and receiver knows the existence of communication. But in cryptography, encrypted messages can attract unwanted attention from third parties. The advanced versions for secure information exchange are derived from these basic types, either as a combination or a more powerful version of the basic type. This paper aims at exploring the various steganographic methods found in the literature with a brief description of their advantages and disadvantages.

image hiding, Least significant bit (LSB), discrete cosine transform (DCT), discrete wavelet transform (DWT), pixel value differencing (PVD), distortion, masking and filtering, image mosaic.

" Image Steganography - Fundamentals and Literature survey", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.2, Issue 7, page no.3046-3051, July-2015, Available :http://www.jetir.org/papers/JETIR1507011.pdf

" Image Steganography - Fundamentals and Literature survey", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.2, Issue 7, page no. pp3046-3051, July-2015, Available at : http://www.jetir.org/papers/JETIR1507011.pdf