This system uses three stages to hide the secret letter. The first stage uses the summation of two images and applies a 2D wavelet packet at level one (L1), level two (L2), and level three (L3). In the second stage, Haar filters are applied at L1, L2, and L3, and the third stage conceals the binary secret letter using AS CII to convert each symbol in the secret letter to a binary number to hide it in the 2D image wavelet packet. It can hide each bit in one location using the least significant bit (LSB). The secret key is used to select the location, which depends on the equation 2n2 + 1 to find the position of the hidden bits of the secret letter in the 2D wavelet packet. The outcome of the algorithm is efficient, robust, transparent, and highly secure. The system hides the secret letter well in the stego image without being sensed by attackers.

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