Visual-Crypto-QR

Visual cryptography implementation. Provide with QR code encode/decode pipeline.

This work is a part of course project of IS497, spring, 2020.

About

Visual cryptography implementation of string/QR code encoding/decoding, and image visual cryptography encryption/decryption. All functions can be used individually or as a pipeline.

Base on QR code, the project can encrypt/decrypt any string type messages. Also it can use visual cryptography feature solely to encrypt/decrypt images.

Feature

• Use QR code to implement string encryption with visual cryptography.

• With QR code capacity and anti-noise characteristic to enhance visual cryptography performance.

• Post-process decrypted images to further improve image quality.

Usage

QR Encode

import qr_coder
def str2qr(string):
    qEncoder = qr_coder.qrEncoder()
    img = qEncoder.enc_str(string)
    img.save("./temp/msg.png")
    return img

QR Decode

import qr_coder
import cv2 as cv
def qr2str(qr_path):
    qDecoder = qr_coder.qrDecoder()
    imgarr = cv.imread(qr_path)
    string = qDecoder.dec_str(qDecoder.process(imgarr))
    return string

Image Encrypt

import visual_crypto
from PIL import Image
def qr2vc(qr_path):
    cryptCoder = visual_crypto.cryptCoder(path_dir='./temp/')
    # Get QR image
    img = Image.open("./temp/msg.png")
    cryptCoder.get_msg(img)
    # Generate secret and cipher image
    img_sct = self.cryptCoder.get_sct()
    img_cph = self.cryptCoder.get_cph()
    # Save or return
    img_sct.save("./temp/sct.png")
    img_cph.show("./temp/cph.png")
    return img_sct, img_cph

Image Decrypt

import visual_crypto
def vc2qr(img_sct, img_cph):
    cryptCoder = visual_crypto.cryptCoder(path_dir='./temp/')
    img_out = cryptCoder.get_out(img_sct, img_cph)
    img_out.save("./temp/out.png")
    return img_out