A Comparative Study of Performance and Security Issues of Public Key Cryptography and Symmetric Key Cryptography in Reversible Data Hiding

摘要

Security of data is the main aspect to be considered in the digital network. Data transmission can be made secure by performing reversible data hiding in images. Here the data can be hidden and transmitted inside a host image. Security to the image can be provided by various algorithms like symmetric key algorithm and public key algorithms. This paper provides a comparative study of AES and RSA algorithms for image encryption and reversible data hiding. Data embedding in both cases is done by histogram shifting method. The RSA algorithm can be used for encrypting the image to provide higher security but consumes more time whereas the security of image in AES algorithm is comparatively small but consumes only small amount of time for both encryption and decryption.