Pannic17 / C2-Week05

Python Image Hashing and Encryption Script

This script implements an image hashing and encryption algorithm using the Marr-Hildreth and Block Mean Hashing algorithms from the OpenCV library. The script reads an image, generates a hash using the Marr-Hildreth algorithm, and then uses this hash to hide a message within the image. The Block Mean Hash algorithm is then used to adjust the pixel values to create a "glitch" effect. The major implementation of the script is to perform the following operations:

• Hash an image using the MarrHildrethHash and BlockMeanHash functions.
• Convert the hash values to hexadecimal and binary representations.
• Convert the hash values to RGB values for use in image manipulation.
• Replace pixels in an image with ASCII characters based on the hash values.
• Glitch an image by adjusting the y-coordinate of pixels based on the hash values.

How to use the script

The hash_hide function takes a path to an image as an argument and performs the following operations:

• Resizes the image to 256x256 pixels.
• Hashes the image using MarrHildrethHash.
• Converts the hash values to a hexadecimal representation.
• Replaces pixels in the image with ASCII characters based on the hash values.
• Displays the modified image using the OpenCV imshow function.

The hash_glitch function takes a path to an image as an argument and performs the following operations:

• Resizes the image to 256x256 pixels.
• Hashes the image using MarrHildrethHash and BlockMeanHash.
• Converts the hash values to a hexadecimal representation.
• Converts the hash values to RGB values.
• Adjusts the y-coordinate of pixels in the image based on the hash values.
• Displays the modified image using the OpenCV imshow function.

Requirements

The following libraries are required to run the script:

• OpenCV (cv2)
• Numpy

Code Organization

The code is organized as follows:

• Import statements for the required libraries.
• The print_hi function is a simple function for testing purposes.
• The decimal2hex function takes a list of decimal values and converts them to a hexadecimal representation.
• The resize function takes an image and resizes it to the specified width and height (default 256x256).
• The convert_hash2rgb function takes a list of decimal values and converts them to RGB values.
• The convert_char2rgb function takes an ASCII character and converts it to an RGB value.
• The replace_pixel_hide function takes an image, a string of ASCII characters, and a list of decimal values and replaces pixels in the image with ASCII characters based on the hash values.
• The decimal2qua function takes a list of decimal values and converts them to a 4-digit base representation.
• The decimal2bin function takes a list of decimal values and converts them to a binary representation.
• The adjust_y_position function takes an ASCII character, a 4-digit base representation, and a binary representation and returns a y-coordinate offset for use in image manipulation.
• The get_ascii function takes an ASCII character and returns its decimal value.
• The hash_hide function takes a path to an image and performs the operations described above to hide ASCII characters in the image.