replydev/cotp

Trustworthy, encrypted, command-line TOTP/HOTP authenticator app with import functionality.

Language: Rust - Size: 1.53 MB - Last synced: 6 days ago - Pushed: 6 days ago - Stars: 211 - Forks: 18

scito/extract_otp_secrets

Extract one time password (OTP) secrets from QR codes exported by two-factor authentication (2FA) apps such as "Google Authenticator". The exported QR codes from authentication apps can be captured by camera, read from images, or read from text files. The secrets can be exported to JSON or CSV, or printed as QR codes to console.

Language: Python - Size: 33.6 MB - Last synced: 6 days ago - Pushed: 6 days ago - Stars: 988 - Forks: 124

dim13/otpauth

Google Authenticator migration decoder

Language: Go - Size: 228 KB - Last synced: 8 days ago - Pushed: 24 days ago - Stars: 610 - Forks: 58

tg123/sshpiper

The missing reverse proxy for ssh scp

Language: Go - Size: 56.9 MB - Last synced: 8 days ago - Pushed: 8 days ago - Stars: 927 - Forks: 124

sonata-project/GoogleAuthenticator Fork of rande/GoogleAuthenticator 📦

[Abandoned] Library to integrate Google Authenticator into a PHP project

Language: PHP - Size: 555 KB - Last synced: 9 days ago - Pushed: over 2 years ago - Stars: 436 - Forks: 122

yeojz/otplib

:key: One Time Password (OTP) / 2FA for Node.js and Browser - Supports HOTP, TOTP and Google Authenticator

Language: TypeScript - Size: 7.91 MB - Last synced: 11 days ago - Pushed: over 1 year ago - Stars: 1,870 - Forks: 128

ellaisys/aws-cognito

AWS Cognito package (with MFA Feature) using the AWS SDK for PHP/Laravel

Language: PHP - Size: 756 KB - Last synced: 14 days ago - Pushed: 14 days ago - Stars: 107 - Forks: 42

akanass/rx-otp

HMAC-based (HOTP) and Time-based (TOTP) One-Time Password manager. Works with Google Authenticator for Two-Factor Authentication.

Language: TypeScript - Size: 543 KB - Last synced: 14 days ago - Pushed: about 1 year ago - Stars: 77 - Forks: 9

2fa-pwa/2fa-pwa

PWA for scanning two factor auth qr codes. Scanned codes can be downloaded from and uploaded to this app

Language: TypeScript - Size: 695 KB - Last synced: 15 days ago - Pushed: 16 days ago - Stars: 1 - Forks: 1

AriaLyy/KeepassA

Android Keepass Software based on Keepass database

Language: Kotlin - Size: 25.6 MB - Last synced: about 1 month ago - Pushed: about 2 months ago - Stars: 173 - Forks: 24

lfkeitel/php-totp

HOTP and TOTP token generation

Language: PHP - Size: 8.79 KB - Last synced: 11 days ago - Pushed: about 2 years ago - Stars: 65 - Forks: 12

lightyen/otp-go

OTP demo with golang

Language: HTML - Size: 22.5 KB - Last synced: 22 days ago - Pushed: 22 days ago - Stars: 0 - Forks: 0

hectorm/otpauth

One Time Password (HOTP/TOTP) library for Node.js, Deno, Bun and browsers.

Language: JavaScript - Size: 7.57 MB - Last synced: 25 days ago - Pushed: 27 days ago - Stars: 834 - Forks: 52

0x4f53/Wristkey

A free and open-source 2FA app for smartwatches.

Language: Kotlin - Size: 366 MB - Last synced: 25 days ago - Pushed: 2 months ago - Stars: 125 - Forks: 8

X1nto/Mauth

A Material You Two-factor Authentication app

Language: Kotlin - Size: 4.45 MB - Last synced: 28 days ago - Pushed: 28 days ago - Stars: 364 - Forks: 17

chanyipiaomiao/devops-api

Golang + Beego 编写 提供开发/运维常用操作的HTTP API接口: 手机归属地查询、IP地址查询、工作日节假日判断、微信报警、钉钉报警、2步验证、密码存储、发送邮件、生成随机密码等功能

Language: Go - Size: 469 KB - Last synced: 13 days ago - Pushed: about 5 years ago - Stars: 309 - Forks: 103

Luzifer/nginx-sso

SSO authentication provider for the auth_request nginx module

Language: Go - Size: 26.8 MB - Last synced: 25 days ago - Pushed: 5 months ago - Stars: 281 - Forks: 41

jernojes/Desktop-Google-Authenticator

Size: 1.95 KB - Last synced: 29 days ago - Pushed: 29 days ago - Stars: 0 - Forks: 0

nilsstreedain/duo-bypass

🔓 Cisco DUO Mobile App OTP Bypass

Language: HTML - Size: 422 KB - Last synced: 25 days ago - Pushed: about 1 month ago - Stars: 11 - Forks: 1

creachadair/otp

A Go implementation of the HOTP (RFC 4226) and TOTP (RFC 6238) algorithms.

Language: Go - Size: 60.5 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 14 - Forks: 3

peresbingo/Desktop-Google-Authenticator

Size: 1.95 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 0 - Forks: 0

PlanetHoster/time2fa

A comprehensive Node.js package that simplifies the implementation of One-Time Password (OTP).

Language: TypeScript - Size: 1.17 MB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 87 - Forks: 7

suvash/one-time

One Time Password (TOTP and HOTP) library for Clojure. TOTP/HOTP is widely used for Two Factor / Multi Factor Authentication.

Language: Clojure - Size: 176 KB - Last synced: 24 days ago - Pushed: 7 months ago - Stars: 159 - Forks: 17

bentoslod/Desktop-Google-Authenticator

Size: 1.95 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 0 - Forks: 0

wuyanxin/totp.js

🎲TOTP(Time-based one-time password) generator, support for Google Authenticator

Language: JavaScript - Size: 88.9 KB - Last synced: about 1 month ago - Pushed: about 2 months ago - Stars: 120 - Forks: 42

lockp111/google-auth

google authenticator

Language: Go - Size: 2.93 KB - Last synced: about 1 month ago - Pushed: over 4 years ago - Stars: 0 - Forks: 0

jltorresm/otpgo

Time-Based One-Time Password (TOTP) and HMAC-Based One-Time Password (HOTP) library for Go.

Language: Go - Size: 70.3 KB - Last synced: 26 days ago - Pushed: about 3 years ago - Stars: 65 - Forks: 9

zhangyuan/google-authenticator-extractor

A command line tool to extract secrets from Google Authenticator's QR code. 从 Google Authenticator 中导出二次验证密钥的命令行工具

Language: Rust - Size: 184 KB - Last synced: 21 days ago - Pushed: 21 days ago - Stars: 9 - Forks: 1

JeremieRodon/Get-MfaCode

Allow to easily manage multiples Google Auth tokens on the computer

Language: PowerShell - Size: 21.5 KB - Last synced: about 1 month ago - Pushed: over 5 years ago - Stars: 1 - Forks: 0

maurodelazeri/google-authenticator

Generate Google Authentication Codes with golang

Language: Go - Size: 3.91 KB - Last synced: about 1 month ago - Pushed: over 5 years ago - Stars: 1 - Forks: 1

cloudposse/bastion

🔒Secure Bastion implemented as Docker Container running Alpine Linux with Google Authenticator & DUO MFA support

Language: Shell - Size: 298 KB - Last synced: 25 days ago - Pushed: about 2 months ago - Stars: 635 - Forks: 112

catalyst/moodle-tool_mfa

A Multi-Factor Authentication Moodle plugin with flexible support for TOTP, Email, IP and more

Language: PHP - Size: 1.67 MB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 31 - Forks: 37

maxwellium/tiffy

two factor authentication - generation, validation and publish to common apps. zero dependencies

Language: TypeScript - Size: 55.7 KB - Last synced: about 1 month ago - Pushed: 5 months ago - Stars: 3 - Forks: 1

rm-hull/zaup2

A TOTP authenticator for the web

Language: TypeScript - Size: 7.43 MB - Last synced: about 2 months ago - Pushed: about 2 months ago - Stars: 3 - Forks: 1

AnkitSharma-007/ASPCore.Two-Factor-Authentication

Perform two factor authentication in an ASP.NET core application using Google Authenticator app

Language: C# - Size: 1.31 MB - Last synced: 25 days ago - Pushed: about 6 years ago - Stars: 40 - Forks: 25

samdjstevens/java-totp

A java library for implementing Time-based One Time Passwords for Multi-Factor Authentication.

Language: Java - Size: 146 KB - Last synced: about 1 month ago - Pushed: 5 months ago - Stars: 404 - Forks: 100

marcelkliemannel/kotlin-onetimepassword

A Kotlin one-time password library to generate "Google Authenticator", "Time-based One-time Password" (TOTP) and "HMAC-based One-time Password" (HOTP) codes based on RFC 4226 and 6238.

Language: Kotlin - Size: 299 KB - Last synced: about 1 month ago - Pushed: about 1 month ago - Stars: 134 - Forks: 22

antaresproject/two_factor_auth

:key: 2FA Implementation Antares Component with Google and Yubikey authenticators

Language: PHP - Size: 197 KB - Last synced: about 2 months ago - Pushed: over 6 years ago - Stars: 1 - Forks: 1

enygma/gauth

Google Authenticator Code Validation and Generation

Language: PHP - Size: 17.6 KB - Last synced: 10 days ago - Pushed: over 6 years ago - Stars: 75 - Forks: 12

Utkarsh-vishnoi/laravel-2-step-verification

Easily set up 2 factor authentication with laravel

Language: PHP - Size: 7.81 KB - Last synced: about 2 months ago - Pushed: over 7 years ago - Stars: 0 - Forks: 0

martinrlilja/exodus

Extract OTP secrets from Google Authenticator exports.

Language: Rust - Size: 42 KB - Last synced: about 1 month ago - Pushed: about 1 year ago - Stars: 2 - Forks: 0

raphaelvserafim/google-authenticator-ts

Este projeto implementa um autenticador compatível com o Google Authenticator, fornecendo funcionalidades para geração de códigos TOTP (Time-based One-Time Password), verificação de códigos, geração de segredos e criação de URLs para códigos QR.

Language: TypeScript - Size: 6.84 KB - Last synced: 27 days ago - Pushed: about 2 months ago - Stars: 1 - Forks: 0

chroma-x/php-oath-server-suite

A collection of classes to provide second factor authentication like Yubico OTP (Yubikey), Oath (TOTP, HOTP, GoogleAuthenticator) server-side written in PHP.

Language: PHP - Size: 57.6 KB - Last synced: about 1 month ago - Pushed: over 3 years ago - Stars: 4 - Forks: 1

aidan-/SimpleTOTP

A highly configurable yet simple to use TOTP based two-factor authentication processing module for SimpleSAMLphp.

Language: PHP - Size: 33.2 KB - Last synced: 10 days ago - Pushed: about 1 year ago - Stars: 21 - Forks: 18

chillerlan/php-authenticator

A generator for counter- and time based authentication codes (RFC-4226/RFC-6238, Google Authenticator).

Language: PHP - Size: 238 KB - Last synced: 2 months ago - Pushed: 3 months ago - Stars: 30 - Forks: 2

scheb/2fa-google-authenticator

[READ ONLY] Extends scheb/2fa-bundle with two-factor authentication using Google Authenticator

Language: PHP - Size: 25.4 KB - Last synced: 6 days ago - Pushed: about 1 month ago - Stars: 19 - Forks: 2

ventz/openconnect-gui-menu-bar

OpenConnect Menu Bar - Connect/Disconnect/Status - for MacOS (supports Duo push/sms/phone, or Yubikey, Google Authenticator, Duo, or any TOTP) and SAML

Language: Shell - Size: 177 KB - Last synced: 2 months ago - Pushed: 7 months ago - Stars: 64 - Forks: 11

cerus/faktor

🔐 Tiny & lightweight RFC 4226 & RFC 6238 compliant one-time password (HOTP/TOTP) generation & validation library for Java

Language: Java - Size: 26.4 KB - Last synced: 25 days ago - Pushed: about 1 year ago - Stars: 2 - Forks: 0

rioastamal/gembok

Browser based 2FA token generator alternative to Google Authenticator.

Language: HTML - Size: 51.8 KB - Last synced: 3 months ago - Pushed: over 1 year ago - Stars: 49 - Forks: 3

chronoxor/CppSecurity

C++ Security Library

Language: C++ - Size: 61.3 MB - Last synced: about 2 months ago - Pushed: 3 months ago - Stars: 33 - Forks: 21

atomjoy/py2fa

Desktop Python 2FA Authenticator Tkinter GUI app and script. The script generates two factor authentication codes for secret keys from json file.

Language: Tcl - Size: 288 KB - Last synced: 3 months ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

atomjoy/google-authenticator

2FA two-step verification with php and Google Authenticator in Laravel.

Language: PHP - Size: 4.88 KB - Last synced: about 1 month ago - Pushed: 3 months ago - Stars: 0 - Forks: 0

guyromm/svelte-postgrest-template

Svelte/SvelteKit + PostgREST + EveryLayout + social auth starter template

Language: Svelte - Size: 890 KB - Last synced: 2 months ago - Pushed: 4 months ago - Stars: 52 - Forks: 4

shalva97/google-auth-decode

Decode Google Authenticator URI

Language: Kotlin - Size: 2.02 MB - Last synced: 4 months ago - Pushed: 4 months ago - Stars: 9 - Forks: 0

mddanish/Vulnerable-OTP-Application

Vulnerable OTP/2FA Application written in PHP using Google Authenticator

Language: PHP - Size: 47.9 KB - Last synced: 3 months ago - Pushed: over 4 years ago - Stars: 79 - Forks: 34

MincDev/php-2-factor-authentication

A library for securely generating a 2 factor authentication QR code to use with Google Autnenticator

Language: PHP - Size: 9.77 KB - Last synced: 7 days ago - Pushed: over 1 year ago - Stars: 4 - Forks: 0

revathskumar/rofi-totp

A rofi plugin for Two-Factors Authentication

Language: Rust - Size: 42 KB - Last synced: about 1 month ago - Pushed: 4 months ago - Stars: 3 - Forks: 2

pzl/totp

python implementation of 2-step auth: Time-based, One-Time Password Algorithm

Language: Python - Size: 102 KB - Last synced: 27 days ago - Pushed: over 10 years ago - Stars: 5 - Forks: 0

scheb/two-factor-bundle 📦

[ABANDONED] Two-factor authentication for Symfony 2 & 3 applications 🔐. Please use the newer versions from https://github.com/scheb/2fa.

Language: PHP - Size: 2.08 MB - Last synced: about 2 months ago - Pushed: over 2 years ago - Stars: 386 - Forks: 112

jocic/PHP.GoogleAuthenticator

Complete & easy-to-implement MFA solution for use with Google Authenticator App.

Language: PHP - Size: 1.48 MB - Last synced: 22 days ago - Pushed: 22 days ago - Stars: 24 - Forks: 4

Zwyx/google-authenticator-export-format

How to rename the issuers of your Google Authenticator one-time passwords

Size: 1.58 MB - Last synced: about 1 month ago - Pushed: over 2 years ago - Stars: 4 - Forks: 0

juashyam/2-Factor-Authentication

Google 2 Factor Authentication for Magento 2

Language: PHP - Size: 35.2 KB - Last synced: 2 months ago - Pushed: 2 months ago - Stars: 2 - Forks: 11

vedhavyas/twothy

Two factor authenticator for CLI

Language: Go - Size: 57.6 KB - Last synced: 3 months ago - Pushed: about 1 year ago - Stars: 39 - Forks: 0

corsin1337/google-authenticator-TOTP

PHP-based 6-digit Time-based One-Time Password (TOTP) generator for applications such as two-factor authentication with Google Authenticator like specified in HOTP (RFC-4226) and TOTP (RFC-6238).

Language: PHP - Size: 15.6 KB - Last synced: 25 days ago - Pushed: about 1 year ago - Stars: 4 - Forks: 0

hoangdz1005/otp-generator-app

generate otp using twilio sms, email, google authenticator

Language: Java - Size: 76.2 KB - Last synced: 5 months ago - Pushed: 5 months ago - Stars: 0 - Forks: 0

dpikalov/hotp-totp

Generate One-Time passwords in JS using WebCrypto API

Language: JavaScript - Size: 11.7 KB - Last synced: 27 days ago - Pushed: over 2 years ago - Stars: 8 - Forks: 1

khurozov/totp

Java implementation of TOTP

Language: Java - Size: 23.4 KB - Last synced: 4 months ago - Pushed: 5 months ago - Stars: 2 - Forks: 0

bardiademon/signin-with-google

SignIn With Google

Language: Java - Size: 10.7 KB - Last synced: about 1 month ago - Pushed: 6 months ago - Stars: 1 - Forks: 0

pedrosancao/php-otp

One-time password PHP implementation of HMAC-based algorithm according to RFC 4226 and RFC 6238 compatible with Google Authenticator.

Language: PHP - Size: 25.4 KB - Last synced: 2 months ago - Pushed: over 2 years ago - Stars: 13 - Forks: 2

williamollio/ft_transcendence

The last project of the core curriculum at 42 Heilbronn using the PERN stack

Language: TypeScript - Size: 136 MB - Last synced: 2 months ago - Pushed: 6 months ago - Stars: 4 - Forks: 0

louisbrulenaudet/totpsaurus

Ultralight, non-dependent and minimalist open-source package for generating Time-based One-Time Passwords (TOTPs), creating OTP URLs, and generating secure backup codes for account recovery.

Language: JavaScript - Size: 163 KB - Last synced: 14 days ago - Pushed: 10 months ago - Stars: 3 - Forks: 0

PowderLinux/PyOTP-Script

Python scripts to generate TOTP based codes

Language: Python - Size: 35.2 KB - Last synced: 6 months ago - Pushed: over 3 years ago - Stars: 1 - Forks: 0

Ashwinbicholiya/Food-delivery-app

food delivery App

Language: Dart - Size: 518 KB - Last synced: 7 months ago - Pushed: about 2 years ago - Stars: 215 - Forks: 121

henrymbuguak/django-email-confirmation-and-two-factor-authentication-using-the-google-authenticator-app

Django registration with confirmation email and two factor authentication using the google authenticator app

Language: Python - Size: 134 KB - Last synced: 15 days ago - Pushed: almost 6 years ago - Stars: 1 - Forks: 0

viperadnan-git/second-password

An authenticator that implements two-step verification service using the Time-base OTP algorithm

Language: HTML - Size: 55.7 KB - Last synced: 29 days ago - Pushed: over 1 year ago - Stars: 11 - Forks: 5

dhairyathedev/authburst

TOTP Authenticator Application

Language: JavaScript - Size: 333 KB - Last synced: 2 months ago - Pushed: 2 months ago - Stars: 0 - Forks: 0

angt/totp

A tiny command line utility to generate OTP tokens

Language: C - Size: 3.91 KB - Last synced: 25 days ago - Pushed: 7 months ago - Stars: 31 - Forks: 6

Emzi0767/EzOTP

A simple, easy-to-use one-time password generator implementation for .NET Core 3.1. Compatible with Google Authenticator.

Language: C# - Size: 61.5 KB - Last synced: 25 days ago - Pushed: over 3 years ago - Stars: 6 - Forks: 0

pentiminax/symfony-google-authenticator

Dépôt pour l'implémentation de l'authentification à deux facteurs avec Google Authenticator

Language: PHP - Size: 58.6 KB - Last synced: 8 months ago - Pushed: 8 months ago - Stars: 0 - Forks: 0

gagan-chawla/easy-ovpn

For quick login when using 2FA with VPN (PIN + Passcode)

Language: Python - Size: 9.77 KB - Last synced: 8 months ago - Pushed: almost 4 years ago - Stars: 0 - Forks: 0

gurushida/totp

A C program to generate 6 digit TOTP codes like Google Authenticator

Language: C - Size: 26.4 KB - Last synced: 8 months ago - Pushed: 11 months ago - Stars: 3 - Forks: 2

yehudah/google-authenticator-exporter

Export and migrate secret keys from Google Authenticator QR codes to other 2FA apps.

Language: Go - Size: 113 KB - Last synced: 8 months ago - Pushed: 8 months ago - Stars: 0 - Forks: 0

itemir/apache_2fa

Apache two-factor (2FA) authentication with Google Authenticator based on Time-based One-Time Password (TOTP) or HMAC-based one-time password (HOTP) Algorithms.

Language: Python - Size: 127 KB - Last synced: 8 months ago - Pushed: 8 months ago - Stars: 68 - Forks: 30

richfelker/totp.sh

Shell script implementation of TOTP (RFC 6238) using openssl command line tool

Language: Shell - Size: 2.93 KB - Last synced: 25 days ago - Pushed: almost 4 years ago - Stars: 51 - Forks: 4

magetarian/customerTwoFactorAuth

Two Factor Authentication for Customers

Language: PHP - Size: 293 KB - Last synced: 25 days ago - Pushed: almost 2 years ago - Stars: 7 - Forks: 3

rootauthenticator/authenticator-mobile

Language: TypeScript - Size: 505 KB - Last synced: 5 months ago - Pushed: 5 months ago - Stars: 1 - Forks: 0

GabrielSalangsang013/ts-mern-with-auth-boilerplate

Typescript MERN with Authentication using JWT Boilerplate. Deployed Project Link - https://deploy-production-ts-mern-with-auth-boilerplate-frontend.vercel.app/

Language: TypeScript - Size: 2.76 MB - Last synced: 8 months ago - Pushed: 8 months ago - Stars: 4 - Forks: 0

kumar-vibhanshu/Google_login

Google_login

Size: 1000 Bytes - Last synced: 8 months ago - Pushed: over 3 years ago - Stars: 0 - Forks: 0

byildiz/topgen

Time-based one-time password generator

Language: Python - Size: 18.6 KB - Last synced: 16 days ago - Pushed: 9 months ago - Stars: 1 - Forks: 1

seonggukchoi/otp-generator 📦

A simple Time-based OTP key generator use otplib

Language: JavaScript - Size: 2.93 KB - Last synced: 9 months ago - Pushed: over 5 years ago - Stars: 0 - Forks: 0

marvinhuelsmann/yourweb

You can create your own website

Language: Vue - Size: 1.78 MB - Last synced: 9 months ago - Pushed: over 1 year ago - Stars: 7 - Forks: 0

cenkerkumlucali/google-authenticator

Extract two-factor authentication (2FA, TFA) secret keys from export QR codes of "Google Authenticator" console app

Language: C# - Size: 102 KB - Last synced: 24 days ago - Pushed: about 2 years ago - Stars: 3 - Forks: 0

rxnew/docker-openssh-server

OpenSSH server on Docker

Language: Shell - Size: 2.93 KB - Last synced: 9 months ago - Pushed: over 6 years ago - Stars: 0 - Forks: 0

lab8-tomofi/online-totp-generator

Online TOTP Generator

Language: JavaScript - Size: 15.6 KB - Last synced: 9 months ago - Pushed: 9 months ago - Stars: 0 - Forks: 0

aaal-dev/bbry-gauth 📦

[droped] Google Authenticator for Blackberry 10

Language: C++ - Size: 10.5 MB - Last synced: 9 months ago - Pushed: over 6 years ago - Stars: 2 - Forks: 1

hvmonteiro/2fa-authenticator

A 2FA interactive authenticator for the command line

Language: Shell - Size: 361 KB - Last synced: 9 months ago - Pushed: over 6 years ago - Stars: 3 - Forks: 0

Jaagrav/Responsive-WhatsApp-Clone

A working web based WhatsApp Clone with a responsive UI for one to one communication. Including Google Auth to verify users and avoid spam.

Language: JavaScript - Size: 1.79 MB - Last synced: 25 days ago - Pushed: over 3 years ago - Stars: 5 - Forks: 7

AginSquash/GAuthDecrypt

Library for decrypting 2FA secret keys from export QR codes of Google Authenticator app

Language: Swift - Size: 22.5 KB - Last synced: 9 months ago - Pushed: 9 months ago - Stars: 4 - Forks: 0

vanderblugen/Linux-U2F-Via-SSH

Setup Linux U2F for use in SSH

Size: 21.5 KB - Last synced: 10 months ago - Pushed: almost 2 years ago - Stars: 0 - Forks: 0

antonin-lebrard/Console-2FA-Encrypted-Wallet

2FA totp keys encrypted catalog

Language: JavaScript - Size: 14.6 KB - Last synced: 10 months ago - Pushed: over 4 years ago - Stars: 0 - Forks: 0