This project, the image owner directly divides the cover-image into groups of a reference pixel and T-adjacent pixels and uploads to the data hider by using NTRU Encrypt. Thedatahider calculates absolute differences of adjacent pixels in each group to obtain histogram of absolute differences. Thereare some issues such as a large number of keys and difficult key management, Though the algorithm encrypts the data into unreadable data and it will destroy the algebraic structure of the encrypted data. Afterwards, this will make it impossible to process the encrypted data.