Secure multi-group data hiding based on gemd map

Numerous data hiding schemes have been recently proposed based on section-wise strategy. The purpose of these approaches is to enhance security by using a unique key to generate a table. But these approaches are not matched between the embedding secret data length for binary bits and the length of the notation system in the section-wise strategy. In order to enhance the security of secret data and increase embedding capacity, we will propose a secure multi-group data hiding scheme based on General Exploiting Modification Direction (GEMD) map in this paper. Three major advantages exist in our scheme. First is flexibility for the number and combination of elements. Second is the removal of spatial redundancy in our method while maintaining embedding capacity above 1 bpp. Lastly, this method avoids the overflow/underflow problem. Experimental results show that our method enhances embedding capacity and maintains good visual stego image quality. In terms of security, the proposed scheme is more secure than LSB replacement method in terms of resisting visual attack and RS testing.