Questions tagged [multi-factor]

a multi factor authentication requires at least two sets of credentials. This is typically something you know (e. g. a password) and something you own (e. g. a token generator or mobile phone), but could also be something you are (a biometric).

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1answer
108 views

What should be done if 2FA was turned off in an unexpected manner?

Today when I logged in Facebook, no 2FA was shown. I have been using SMS message as the second authentication factor. When I looked at the security settings, 2FA seemed to be disabled. I immediately ...
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1answer
180 views

Two Factor Authentication Multiple Devices

Most websites (that I have seen) that implement two factor authentication don't support multiple two factor authentication devices linked to one account. The biggest reasons I can think of for that ...
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6answers
2k views

Is it safe to store 2FA tokens together with passwords in 1password?

I'm using 1password and I've seen 1password allows you to store 2FA tokens in the same place where you store the password. I don't like the idea of having everything in the same place as if someone ...
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1answer
228 views

Is using WebAuthn alone considered as two factor authentication?

Will using WebAuthn for an application make it two factor? I am specifically interested in using Ondevice biometrics and achieve passwordless authentication. For a true two factor authentication you ...
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2answers
169 views

2-step authorization (using SMS) less secure than being without 2FA at all?

I've been thinking about a paradoxical but a theoretically possible event: Even though SMS-based 2-step authorization increases security generally, on the other hand, in some cases, it might become ...
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1answer
42 views

2FA/MFA and Session management

Background Recently observed researchers reporting bugs related to a situation where a website would not invalidate secondary (separate) active session once 2FA/MFA has been enabled in primary ...
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3answers
136 views

Are repeated multi-factor authentication codes a problem

The library I am using (ASP.NET Identity) to generate multi-factor authentication (MFA) codes will produce the same code for a given user within a certain period of time. Therefore if the user ...
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1answer
319 views

​Multi-factor Out of Band Token authentication options suitable as per NIST recommendations 800-63B (published in June, 2017)

In our web application project we are required to establish MF authentication with combination of memorised secret token (password) and Out of Bound token. Earlier we were planning to implement SMS ...
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1answer
165 views

How does a phone call / SMS message verify my identity

More and more I've been seeing online services that want to verify my identity using an automated phone call or text message. The trouble is - they ask me to provide the phone number! It seems the ...
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0answers
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How can I create a 2FA usb for using sudo? [migrated]

I want to create a secure system in which logging in to the system and using sudo requires using both password and a usb. Is there some way I can turn a regular usb into 2FA key? Can you explain the ...
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41 views

Should I offer 'Any n or' or 'n Random' MFA in my webapp, or just 'All MFA'?

I am building a new webapp and I am currently working on the multi factor authentication part. I would like to offer choice when it comes to MFA, and I've been thinking about what choices I can offer. ...
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1answer
3k views

Storing TOTP secret in database, plaintext or encrypted?

I've been reading about 2FA and how it is used, and the thing that struck me most is that everyone seems to be storing the TOTP secret as plaintext in their database. I understand you need the secret ...
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2answers
226 views

Web Application Using Identity Federation & OTP

We are running a web application using a client's identity federation to authenticate users. A new requirement is to use 2FA, we have decided to use an OTP algorithm using Java, similar to this one ...
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1answer
54 views

Generating and securely storing MFA/2FA recovery tokens

I'm trying to implement 2FA on my site, and cannot figure out how to generate and then securely store recovery tokens. From what I've seen, if for whatever reason you cannot MFA (lost your device ...
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1answer
657 views

Are Authy's tokens insecure?

I've been trying out Authy, a Google Authenticator alternative with an optional feature of being able to back up your tokens. They have two types of tokens: Authy-generated tokens and the regular OTP ...
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1answer
63 views

Does trusting a device negate the security benefits provided by 2FA?

I have read 2FA adds a beneficial layer of security when logging into accounts. However, many organizations often ask me if I would like to trust the device that I am using permanently so I don't have ...
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3answers
7k views

Which SSH security is stronger? 2 Factor or Public key

For SSH authentication, which is more secure? 2 Factor Authentication using a USB token/Google Authenticator(time based) OR Public/private key with password Or could they be both used at the same ...
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29 views

Active Directory with multi factor authentication for an existing web application

Customer is asking for LDAP / Active Directory authentication along with OTP (one time password) / multi-factor authentication for an old existing web application written in (asp.net MVC2). Is this ...
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2answers
61 views

How to authorize user between each step in Multi-Factor-Authentication?

Assume an authentication process that has multiple stages ( eg: username/password then OTP) How you can authorize and identify user between each steps? If JWT tokens are used, is it an option to use ...
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3answers
363 views

Two factor authentication(Mobile)

Consider such two factor authentication on web site: say when user enters username/password on web site - and receives SMS on mobile phone number. For attacker to access this he must know your ...
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9answers
51k views

Two-Step vs. Two-Factor Authentication - Is there a difference?

These days, there's pretty much three forms of authentication in general use on the web: Single-factor authentication, e.g.: PIN or password. Two-factor authentication, e.g.: Single-factor plus a ...
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1answer
1k views

How many authentication factors are there?

The three classes that we all know and love: Something you know. Something you have. Something you are. I've also seen references to "somewhere you are". Is this really a fourth factor? How many ...
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1answer
1k views

what is a valid challenge for 2 factor authentication?

When designing a password reset process: Is an email address or an assigned username a valid piece of information (identifier) to ask for in two factor authentication? How does two factor ...
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4answers
860 views

Multi-Single-Factor vs. Multi-Factor Authentication

I was told at university that there exists a difference between the terms Multi Single Factor and Multi-Factor: Multiple single-factor-authenticator are presented to a verifier. Each of them will ...
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4answers
4k views

How is “something you have” typically defined for “two-factor” authentication?

A wide range of products claim to offer "two-factor authentication" (c.v. Two-factor authentication - Wikipedia). Most are deployed as "something you have" to be used in addition to a normal password ...
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2answers
173 views

Is it safe to save a screenshot of my QR code?

For MFA I now use Authy (owned by Twilio) instead of Google Authenticator. I find Authy more convenient because it syncs your accounts between several devices and several authy installations which ...
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1answer
61 views

For two-factor authentication is it a security issue to have phone authentication and Google Titan Security Key?

I am trying to setup my Google account to have some proper security. But I'm finding parts of it confusing. I used to just use my phone as my 2FA device. Where I would get a texted code. Then I ...
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3answers
796 views

What kind of factor is a physical signature?

I'm familiar with the basics of multi-factor authentication. Now I'm trying to understand how a physical signature, as written on, say, a check or a credit card receipt, would be classified: Is it a ...
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0answers
49 views

Is it a good idea to store TOTP tokens in a (synchronised) password safe? [duplicate]

Bitwarden (as an example) allows you to store your TOTP tokens in it. That is: you can use the mobile app to scan the QR code that (e.g.) Amazon AWS gives you, and then it'll generate TOTP codes. So ...
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4answers
98 views

How to secure VPN credentials on end-user devices?

I have a VPN and PKI in place with MFA. My question is: What's the best method/solution for protecting the integrity and identity of end-user certs? I want to make sure that users only able to use VPN ...
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6answers
4k views

Should 2FA be enabled on service accounts?

See the title. I'm involved in a security audit right now, and am wondering whether 2FA should be enabled on not just human login accounts but also on service accounts (non-human accounts)? If so, how ...
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1answer
137 views

TOTP brute force prevention

Lets use Google Authenticator as example. A 6 digit code is generated every 30 second. Each random attempt has 1/1,000,000 chance of success. Server will usually accept code of ±30s which increased ...
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0answers
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Security of Passwords vs Biometrics [duplicate]

Would a password with multi factor authentication be more secure than biometrics? I am asking due to the fact that if biometric data gets compromised, there is no way to change it, and in data ...
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3answers
167 views

When you enable 2FA, why is your second factor required to reset password?

In a conversation with a coworker the other day, I had trouble successfully defending why, when you enable 2FA on a service, you're required to enter a second factor before changing your password (in, ...
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2answers
59 views

Disable Office 365 2FA before period of leave without phone?

On enablement of 2FA in Office 365 Admin center, the only offered 2FA methods are Text message Call Notification in Authenticator app Passcode in Authenticator app Obviously, all of them require me ...
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1answer
158 views

How I Could Have Hacked Any Instagram Account - The Zero Hack

I am new to the field of security. I thought a lot about the following scenario and could not come up with a good solution 1) Suppose I go to instagram forgot password page. I enter a persons mobile ...
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2answers
52 views

Separate Auth DB for Increased Security

I'm a dev working on an app that has a monolith DB (PostgreSQL). We are using a third party provider for AUTH and MFA, but want to move MFA back into our control. The plan was to move the encrypted ...
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1answer
71 views

With 2-factor authentication, is a backup email address or phone a good recovery option?

A lot of sites offer 5 or 10 recovery codes as the backup mechanism if the user loses access to their primary 2FA (usually a phone number). Can we just simply use a backup email address instead, or a ...
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1answer
92 views

Can 2FA keys be duplicated?

I want to order a 2FA key (like yubikey) online and I want to know if someone could make a duplicate of whatever key I order during shipping. I don't want to discuss if someone could access my package....
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1answer
92 views

Diagram of personal information security vulnerability?

Is there a standard diagram format or language for illustrating a security model and what information is needed to access specific accounts? Something like UML for passwords and 2FA? I was recently ...
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0answers
42 views

Gmail's MFA for team?

We have mailboxes on G-Suite from Goole. Currently, we are enabling MFA for all boxes in our team, but what boxes which are used by different people? For now, I found a few solutions, each with its ...
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0answers
44 views

Sufficient to only require 2FA for su elevation?

I have a small web-facing server on my home network. It is headless, and the only way to log in is to ssh with pubkey authentication from within the local network. I wanted to turn on a 2FA ...
54
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5answers
26k views

What is a YubiKey and how does it work?

How do YubiKeys work? Are there any alternatives? Here is a picture of one:
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2answers
799 views

2FA using Kerberos and SSO within CDE

I was wondering if anyone is using Kerberos for their 2FA solution into their CDE for PCI DSS compliance. Also, what does PCI DSS say about SSO once 2FA has occurred through a Radius Server?
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1answer
75 views

What point in Authenticator App 2FA when SMS fallback is enabled

I would like to move away from SMS 2FA (because of Should 2FA over SMS be considered insecure in the wake of recent SS7 attacks? for example). But some services that provide Authenticator apps ...
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3answers
110 views

How to provide two factor authentication code text messages, so that they are not shown on the lock screen?

It's a commonly discussed problem that when a service sends an authentication to the user's phone, the code is often displayed in the preview on the lock screen, which means it's visible to anyone who ...
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1answer
114 views

Best practice for multi-factor re-authentication

We just introduced multi-factor authentication (MFA) to access a remote business network. This has a re-authentication option: to prompt the user to re-enter the password and MFA code periodically. ...
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0answers
32 views

Azure AD — How to only allow MFA configuration from a trusted network?

Hopefully someone as an idea... In Azure AD, how can we allow MFA setup by a user but only allow that configuration to occur on a trusted network? We have trusted networks defined but everything we ...
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4answers
4k views

Does IMAP/POP3/ASP undermine Two-Factor Auth?

When I log in to hotmail or Google or posteo I can only log in using the 2FA that I have set up. However, each provider seems to have an alternative for apps that do not auth via a web client. ...
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0answers
46 views

2FA options for single yubikey and many hosts

I'm considering using yubikey (5 NFC model) as second factor for couple of Linux hosts. I'm interested in sticking it somewhere in PAM stack, so things like sudo are protected. Most of those hosts are ...