Image Authentication in Frequency Domain through G-Let Dihedral Group (IAFD-D3)

In this paper a G-Let based authentication technique has been proposed to authenticate digital documents by embedding a secret image/message inside the cover image in frequency domain. Cover image is transformed into G-Let domain to generate 2n number of G-Lets out of which selected G-Let(s) are embedded with secret message for the purpose of authentication or copyright protection. The special feature of IAFD-D3 is the use of Dihedral Group with ‘n’ equals to three. Thus total six G-Lets are generated out of which only single G-Let is used as a locker to lock the secret. Experimental results are computed and compared with the existing authentication techniques like GASMT, Li’s Method, STMDF, Region-Based based on Mean Square Error (MSE), Peak Signal to Noise Ratio (PSNR), Image Fidelity (IF), Universal Quality Image (UQI) and Structural Similarity Index Measurement (SSIM) shows better performance in IAFD-D3, in terms of low computational complexity and better image fidelity.