diff --git a/.gitignore b/.gitignore
index 59bf362..594a3b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -174,6 +174,6 @@ poetry.toml
 pyrightconfig.json
 
 # Database file
-.db
+*.db
 
 # End of https://www.toptal.com/developers/gitignore/api/python
diff --git a/app/__init__.py b/app/__init__.py
index 8a622c3..4e492d7 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -1,18 +1,24 @@
 """
 author: @GUU8HC
 """
-#pylint: disable=import-outside-toplevel
+#pylint: disable=import-outside-toplevel, line-too-long
 
 from flask import Flask
 
-from app.settings import DEBUG_MODE, USER_DB, SECRET_KEY, SESSION_COOKIE_HTTPONLY, SESSION_COOKIE_SECURE, SESSION_PERMANENT
+from app.settings import DEBUG_MODE, USER_DB, SECRET_KEY, SESSION_COOKIE_HTTPONLY, SESSION_COOKIE_SECURE, SESSION_PERMANENT, SESSION_COOKIE_SAMESITE
 
 def create_app():
     """
     function to create application
+    Issues:
+        #2.c: Session Security
     """
     app = Flask(__name__)
     app.config['SECRET_KEY'] = SECRET_KEY
+    app.config['SESSION_COOKIE_SECURE'] = SESSION_COOKIE_SECURE
+    app.config['SESSION_COOKIE_HTTPONLY'] = SESSION_COOKIE_HTTPONLY
+    app.config['SESSION_COOKIE_SAMESITE'] = SESSION_COOKIE_SAMESITE
+    app.config['SESSION_PERMANENT'] = SESSION_PERMANENT
 
     from app.home import home_bp
     app.register_blueprint(home_bp, url_prefix='/home')
diff --git a/app/authentication/authentication.py b/app/authentication/authentication.py
index a3c9059..ad57c57 100644
--- a/app/authentication/authentication.py
+++ b/app/authentication/authentication.py
@@ -7,6 +7,7 @@
 from app.authenticator import authenticator
 from app.util import login_user, logout_user
 from app.util import get_git_branch
+from app.settings import DEBUG_MODE
 
 from . import authentication_bp
 
@@ -30,7 +31,12 @@ def authenticate(username, password):
     route: /auth/signin/<username>/<password>
     """
     login_user(username)
-    return jsonify({'result': authenticator.authenticate(username, password)})
+    result = authenticator.authenticate(username, password)
+
+    if DEBUG_MODE:
+        print(f"[DEBUG] authentication.py: Authentication result: {result}")
+
+    return jsonify({'result': result})
 
 @authentication_bp.route('/registration')
 def registration():
diff --git a/app/authentication/static/signin.js b/app/authentication/static/signin.js
index 28acc16..3529bb7 100644
--- a/app/authentication/static/signin.js
+++ b/app/authentication/static/signin.js
@@ -1,11 +1,14 @@
-document.getElementById('button-signin').addEventListener('click', function(event) {
-    event.preventDefault(); // Prevent form submission
-    const username = document.querySelector('input[type="text"]').value;
-    const password = document.querySelector('input[type="password"]').value;
-    authenticate(username, password)
+document.addEventListener("DOMContentLoaded", function() {
+    document.getElementById('button-signin').addEventListener('click', function(event) {
+        event.preventDefault(); // Prevent form submission
+        const username = document.querySelector('input[type="text"]').value;
+        const password = document.querySelector('input[type="password"]').value;
+        authenticate(username, password)
+    });
 });
 
 function authenticate(username, password) {
+    console.log("[DEBUG] signin.js: authenticate() called");
     fetch(`/auth/signin/${username}/${password}`, {
         method: 'GET',
         headers: {
diff --git a/app/authenticator/authenticator.py b/app/authenticator/authenticator.py
index 3b08ff5..0362a80 100644
--- a/app/authenticator/authenticator.py
+++ b/app/authenticator/authenticator.py
@@ -4,9 +4,10 @@
 #pylint: disable=wrong-import-position
 #pylint: disable=line-too-long
 
-import hashlib
+from bcrypt import checkpw, gensalt, hashpw
 
 from app.database.user import User
+from app.settings import DEBUG_MODE
 
 class Authenticator:
     """
@@ -20,6 +21,29 @@ def __init__(self, db: User):
         """
         self.db = db
 
+    def hash_password(self, password):
+        """
+        Hashes a given password using bcrypt.
+        Args:
+            password (str): The plaintext password to be hashed.
+        Returns:
+            str: The hashed password as a UTF-8 encoded string.
+        """
+        return hashpw(password.encode(), gensalt()).decode('utf-8')
+
+    def verify_password(self, password, hashed_password):
+        """
+        Verifies if the provided password matches the hashed password.
+        Args:
+            password (str): The plain text password to verify.
+            hashed_password (str): The hashed password to compare against.
+        Returns:
+            bool: True if the password matches the hashed password, False otherwise.
+        """
+        if DEBUG_MODE:
+            print(f"[DEBUG] authenticator.py: Verifying password: {checkpw(password.encode(), hashed_password.encode())}")
+        return checkpw(password.encode(), hashed_password.encode())
+
     def authenticate(self, username, password):
         """
         Authenticate user.
@@ -34,19 +58,7 @@ def authenticate(self, username, password):
         user = self.db.get_user_by_username(username)
 
         # Perform password validation if user exists
-        return user[-1] == self.hash_password(password) if user else False
-
-    def hash_password(self, password):
-        """
-        Return the SHA-256 hash of a password.
-
-        Args:
-            password (String): The provided password.
-
-        Returns:
-            String: The SHA-256 hash of the password.
-        """
-        return hashlib.sha256(password.encode()).hexdigest()
+        return self.verify_password(password, user[-1]) if user else False
 
     def register(self, username, password):
         """
diff --git a/app/database/dbs/user.db b/app/database/dbs/user.db
index 073a2e3..e02e8ac 100644
Binary files a/app/database/dbs/user.db and b/app/database/dbs/user.db differ
diff --git a/app/home/static/home-private.js b/app/home/static/home-private.js
index a676dc4..f2f2f52 100644
--- a/app/home/static/home-private.js
+++ b/app/home/static/home-private.js
@@ -1,6 +1,8 @@
-document.getElementById('button-signout').addEventListener('click', function(event) {
+document.addEventListener("DOMContentLoaded", function() {
+    document.getElementById('button-signout').addEventListener('click', function(event) {
     event.preventDefault();
     redirect_signout();
+    });
 });
 
 function redirect_signout(){
diff --git a/app/settings.py b/app/settings.py
index 80a9d30..a124d8f 100644
--- a/app/settings.py
+++ b/app/settings.py
@@ -12,3 +12,4 @@
 SESSION_COOKIE_HTTPONLY = True
 SESSION_COOKIE_SECURE = True  # Use this in production with HTTPS
 SESSION_PERMANENT = False
+SESSION_COOKIE_SAMESITE = 'Strict'  # CSRF protection