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MFA Implementation

MFA Implementation

MFA Implementation

MFA Implementation

MFA Implementation

MFA Implementation

MFA Implementation

MFA Implementation

MFA Implementation

MFA Fundamentals

Multi-factor authentication requires two or more factors: something you know (password), something you have (phone), or something you are (biometric).

TOTP Implementation

Time-based One-Time Passwords (TOTP) are the most widely deployed MFA method:

import pyotp

import qrcode

import io

import base64

class TOTPManager:

def init(self, issuer="Example Corp"):

self.issuer = issuer

def generate_secret(self):

return pyotp.random_base32()

def get_provisioning_uri(self, email, secret):

totp = pyotp.TOTP(secret)

return totp.provisioning_uri(name=email, issuer_name=self.issuer)

def generate_qr(self, email, secret):

uri = self.get_provisioning_uri(email, secret)

qr = qrcode.make(uri)

buf = io.BytesIO()

qr.save(buf, format="PNG")

return base64.b64encode(buf.getvalue()).decode()

def verify_code(self, secret, code):

totp = pyotp.TOTP(secret)

Allow 1 step before/after for clock drift

return totp.verify(code, valid_window=1)

def get_current_code(self, secret):

totp = pyotp.TOTP(secret)

return totp.now()

SMS-Based MFA

import random

import string

class SMSMFAManager:

def init(self, sms_provider):

self.sms_provider = sms_provider

self.codes = {} # phone -> {code, expires_at}

def send_code(self, phone):

code = ''.join(random.choices(string.digits, k=6))

expiry = datetime.utcnow() + timedelta(minutes=5)

self.codes[phone] = {"code": code, "expires_at": expiry}

self.sms_provider.send(phone, f"Your code is: {code}")

return True

def verify_code(self, phone, code):

stored = self.codes.get(phone)

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