Login message, he generates a login token which will usually be valid forĪn amount of time which Bob decides on based on security needs, and sometimesīased on whether Alice included a 'remember me' option in her login message.īut for the purposes of this article, the exact process is besides the pointĪnd we can simplify things to Bob needing to authenticate a single message fromĪlice. ID and a hash of her password, and after Bob verifies the authenticity of the Instead, she will send a login message to Bob containing her Of course, in practice, Alice would not attach her password to every message The most common authentication factor used (at least on the web) is a Each such attached piece of information is called an authenticationįactor. Receiver, wanting to confirm that the originator of a message he receives,Ĭlaiming to be from Alice, is truly Alice.Īuthentication is often done by attaching information to transmitted The problem of authentication is that of Bob, the Alice is called the originatorĪnd Bob the receiver. Scenario of Alice sending a message to Bob. First, let'sĭefine the problem of authentication. One-time passwords are used as ownership authentication factors. Jump to the HMAC-Based One-Time Password Algorithm (HOTP) section.

Of theory, so if you are already familiar with the terminology and the basics, The first few sections provide an introduction to authentication methods and a bit

On GitHub at and you can access a live version of the The source code for the example demo is available The slides for this project are available here. The example uses Flask, pyotp, and qrcode and is hosted on Google Authenticator based two-step verification on a website is given in Implementations using HOTP and TOTP algorithms. Introduction to two-step authentication, its advantages, and its This post is based on my project's report, and is an Time-Based One-Time Passwords (TOTP) which are used by Google Authenticator for Project to work on for my cryptography course, I decided to do it on Online accounts, well the ones that support it anyway, for a couple of years now,Īnd have been encouraging friends to use it as well.

I have been using Google Authenticator to secure most of my

Google authenticator hotp and totp