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In modern era it is very challenging job that how to secure the data during transaction through internet. The redundancies of digital media as well as the characteristics of human visual system make hiding technology a significant one. Steganography is the art and the science of valuable information in such way that no one, apart from sender and the intended recipients suspect the existence of the messages. Image steganography is the most popular method for message concealment. LSB steganography is one of the methods by which we can hide the valuable data into least significant bit position of cover image pixels. In traditional LSB steganography method pixels are selected from the beginning (upper left corner) of images and successive pixels are selected row wise or column wise. In this paper we have selected middle region as the beginning pixel during embedding processes of secret bit into cover image and embedded the secret bit into the middle region. Then four diagonal pixels of middle region are selected as successive pixels and embed the data into four edges (collection of pixels) of quadrilateral which is created by four diagonal pixels of cover image and finally reach towards the four corners of images. Experimental analysis shows that the proposed algorithm outperforms the existing methods in terms of capacity and security of stego image.