DES_image.ipynb

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        "<a href=\"https://colab.research.google.com/github/noname1711/cryptography_theory/blob/main/DES_image.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
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          "text": [
            "Requirement already satisfied: pycryptodome in /usr/local/lib/python3.10/dist-packages (3.21.0)\n"
          ]
        }
      ],
      "source": [
        "!pip install pycryptodome"
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "import numpy as np\n",
        "from PIL import Image\n",
        "from Crypto.Cipher import DES\n",
        "from Crypto.Util.Padding import pad, unpad\n",
        "from google.colab import files"
      ],
      "metadata": {
        "id": "nVe6Se-xmcA0"
      },
      "execution_count": 2,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "def upload_image():\n",
        "    uploaded = files.upload()\n",
        "    for filename in uploaded.keys():\n",
        "        print(f\"Đã tải lên: {filename}\")\n",
        "        return filename"
      ],
      "metadata": {
        "id": "Zir_sqgAoW7P"
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      "execution_count": 3,
      "outputs": []
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    {
      "cell_type": "code",
      "source": [
        "# Hàm đọc ảnh và chuyển sang numpy array\n",
        "def image_to_array(image_path):\n",
        "    image = Image.open(image_path)\n",
        "    return np.array(image), image.mode"
      ],
      "metadata": {
        "id": "-gohjfiYooaf"
      },
      "execution_count": 4,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "# Hàm chuyển numpy array sang ảnh\n",
        "def array_to_image(array, mode, output_path):\n",
        "    image = Image.fromarray(array.astype(np.uint8), mode)\n",
        "    image.save(output_path)"
      ],
      "metadata": {
        "id": "n4hLNlUyo3yX"
      },
      "execution_count": 5,
      "outputs": []
    },
    {
      "cell_type": "code",
      "source": [
        "def encrypt_image_des(image_array, key):\n",
        "    cipher = DES.new(key, DES.MODE_ECB)\n",
        "    flat_image = image_array.flatten()\n",
        "    padded_data = pad(flat_image.tobytes(), DES.block_size)\n",
        "    encrypted_data = cipher.encrypt(padded_data)\n",
        "    encrypted_array = np.frombuffer(encrypted_data, dtype=np.uint8)\n",
        "    sqrt_size = int(np.ceil(np.sqrt(len(encrypted_array))))\n",
        "    padded_array = np.pad(encrypted_array, (0, sqrt_size**2 - len(encrypted_array)), mode='constant', constant_values=0)\n",
        "    return padded_array.reshape((sqrt_size, sqrt_size)), len(flat_image)"
      ],
      "metadata": {
        "id": "satUhIFSo-fu"
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      "execution_count": 6,
      "outputs": []
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    {
      "cell_type": "code",
      "source": [
        "def decrypt_image_des(encrypted_array, key, original_shape, data_length):\n",
        "    cipher = DES.new(key, DES.MODE_ECB)\n",
        "    flat_encrypted = encrypted_array.flatten()\n",
        "    decrypted_data = unpad(cipher.decrypt(flat_encrypted.tobytes()), DES.block_size)\n",
        "    return np.frombuffer(decrypted_data[:data_length], dtype=np.uint8).reshape(original_shape)"
      ],
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        "id": "4Mi7Emg5BAac"
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      "execution_count": 7,
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      "source": [
        "print(\"1. Mã hóa hình ảnh bằng DES\")\n",
        "print(\"2. Giải mã hình ảnh bằng DES\")\n",
        "choice = input(\"Nhập 1 để mã hóa hoặc 2 để giải mã: \")\n",
        "\n",
        "if choice == \"1\":\n",
        "    image_path = upload_image()\n",
        "    image_array, mode = image_to_array(image_path)\n",
        "    original_shape = image_array.shape\n",
        "    key = input(\"Nhập khóa DES (8 byte): \").encode()\n",
        "    if len(key) != 8:\n",
        "        print(\"Khóa DES phải có độ dài 8 byte.\")\n",
        "        exit()\n",
        "    encrypted_array, data_length = encrypt_image_des(image_array, key)\n",
        "    encrypted_image_path = f\"encrypted_DES_{image_path}\"\n",
        "    array_to_image(encrypted_array, \"L\", encrypted_image_path)\n",
        "    print(f\"Đã mã hóa hình ảnh và lưu tại: {encrypted_image_path}\")\n",
        "    files.download(encrypted_image_path)\n",
        "\n",
        "elif choice == \"2\":\n",
        "    encrypted_image_path = upload_image()\n",
        "    encrypted_array, mode = image_to_array(encrypted_image_path)\n",
        "    original_shape = eval(input(\"Nhập lại hình dạng gốc (VD: (1080, 720, 3)): \"))\n",
        "    data_length = int(input(\"Nhập lại số lượng pixel thực tế: \"))\n",
        "    key = input(\"Nhập khóa DES (8 byte): \").encode()\n",
        "    if len(key) != 8:\n",
        "        print(\"Khóa DES phải có độ dài 8 byte.\")\n",
        "        exit()\n",
        "    decrypted_array = decrypt_image_des(encrypted_array, key, original_shape, data_length)\n",
        "    decrypted_image_path = f\"decrypted_DES_{encrypted_image_path}\"\n",
        "    array_to_image(decrypted_array, mode, decrypted_image_path)\n",
        "    print(f\"Đã giải mã hình ảnh và lưu tại: {decrypted_image_path}\")\n",
        "    files.download(decrypted_image_path)"
      ],
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      "execution_count": 8,
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          "text": [
            "1. Mã hóa hình ảnh bằng DES\n",
            "2. Giải mã hình ảnh bằng DES\n",
            "Nhập 1 để mã hóa hoặc 2 để giải mã: 1\n"
          ]
        },
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          "text": [
            "Saving logo-bach-khoa-ha-noi.jpg to logo-bach-khoa-ha-noi.jpg\n",
            "Đã tải lên: logo-bach-khoa-ha-noi.jpg\n",
            "Nhập khóa DES (8 byte): abT12oiP\n",
            "Đã mã hóa hình ảnh và lưu tại: encrypted_DES_logo-bach-khoa-ha-noi.jpg\n"
          ]
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