Secure Diary with Face Unlock

 Install Requirements

pip install face_recognition opencv-python cryptography

Capture Reference Face

# Optional: capture face from webcam and save as known_face.jpg

import cv2

cam = cv2.VideoCapture(0)

ret, frame = cam.read()

cv2.imwrite("known_face.jpg", frame)

cam.release()

print("Reference face saved.")

Secure Diary Code

import face_recognition

import cv2

import os

from cryptography.fernet import Fernet

from getpass import getpass

import base64

KEY_FILE = "secret.key"

ENC_FILE = "diary.enc"

KNOWN_FACE_FILE = "known_face.jpg"

# === Face Unlock ===

def verify_face():

    if not os.path.exists(KNOWN_FACE_FILE):

        print("Known face image not found.")

        return False

    known_image = face_recognition.load_image_file(KNOWN_FACE_FILE)

    known_encoding = face_recognition.face_encodings(known_image)[0]

    cam = cv2.VideoCapture(0)

    print("Looking for face...")

    ret, frame = cam.read()

    cam.release()

    try:

        unknown_encoding = face_recognition.face_encodings(frame)[0]

        result = face_recognition.compare_faces([known_encoding], unknown_encoding)[0]

        return result

    except IndexError:

        print("No face detected.")

        return False

# === Encryption Helpers ===

def generate_key(password):

    return base64.urlsafe_b64encode(password.encode().ljust(32)[:32])

def encrypt_diary(content, key):

    f = Fernet(key)

    with open(ENC_FILE, "wb") as file:

        file.write(f.encrypt(content.encode()))

    print("Diary encrypted & saved.")

def decrypt_diary(key):

    f = Fernet(key)

    with open(ENC_FILE, "rb") as file:

        data = file.read()

    return f.decrypt(data).decode()

# === Main Diary App ===

def diary_app():

    print("🔐 Secure Diary Access")

    if not verify_face():

        print("Face verification failed. Access denied.")

        return

    password = getpass("Enter your diary password: ")

    key = generate_key(password)

    if os.path.exists(ENC_FILE):

        try:

            decrypted = decrypt_diary(key)

            print("\n📖 Your Diary:\n", decrypted)

        except:

            print("Failed to decrypt. Wrong password?")

            return

    else:

        print("No diary found. Creating new one...")

    new_entry = input("\n✍️ Write new entry (append to diary):\n> ")

    combined = decrypted + "\n\n" + new_entry if 'decrypted' in locals() else new_entry

    encrypt_diary(combined, key)

if __name__ == "__main__":

    diary_app()