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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3
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1answer
143 views

2FA: Difference between Storing Backup Codes & Secret Key

First of all, the secret key in discuss is the one when you cannot scan a QR code in a 2FA setup process, there is a code that you can manually entered into your TOTP-generating device/app. Some ...
3
votes
2answers
165 views

Multi-factor authentication - email link

I'm trying to understand possible issues with the approach of sending the MFA one-time-token to the user as a clickable link in the email. Instead of submitting the OTP on the web page, user will ...
4
votes
2answers
107 views

Can Simultaneous Logins Occur When Two Users Have Both Pieces Of Two-Factor Authentication Information?

In a hypothetical situation (say a screen capture program or rootkit, where, incidentally, a password change will not make any difference) where an attacker has both your password, and sees the two-...
2
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1answer
42 views

MFA token for authentication to a call center

I work for an AWS managed service provider, and we are brainstorming the best way to authenticate someone who calls for support over the phone. Yes, we could use a verbal password, but this can be ...
3
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1answer
50 views

Gmail twofactor auth on untrusted computer

Let's say I log in to gmail on untrusted computer using two factor auth in Google Chrome in incognito mode. Hypothetically some virus can read my email after this even without knowing password (.dll ...
6
votes
1answer
349 views

Using Two-Factor Authentication to Stop Pass-the-Hash

Am looking into mitigations to Pass+the-Hash and Pass-the-Ticket in Active Directory that also improve overall network security, too. Have sorting through some of the many two+factor authentication ...
2
votes
1answer
142 views

What are reasonable alternatives to “Trust this computer” prompts when signing in?

User feedback for a bank authentication website included this comment: It's annoying to get verification codes to my email or phone every time I log in to my Bank account from a new device ......
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4answers
78 views

Someone tried to log into my mail - what do I do?

I have a 2-step verification system for both my gmail accounts. Today, I received a message with a code when I wasn't trying to log in. So someone has my password. What's my next step here? What ...
5
votes
3answers
319 views

How do Pentesters approach attacking 2FA (two factor authentication)?

I'm looking for practical ways to attack 2FA. What do you need to consider and how would you go about testing the effectiveness of 2FA? My only thoughts are that you would attack the implementation ...
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5answers
561 views

Two passwords provide better security than two-factor authentication?

While evaluating 1Password's new Teams service, I noticed rather curious absence of support for multifactor authentication. When asked about the lack of MFA, they replied: We use an Account Key ...
3
votes
1answer
94 views

Can two TOTP clients register at the same time and generate the same tokens?

Note that I'm not talking about systems like Authy, where you can log in to your account on multiple devices and sync your tokens between them -- I'm referring to two completely separate devices that ...
5
votes
1answer
565 views

YubiKey or Google authenticator?

I'm using lastpass and I would like to implement a 2FA in my account, but I don't know which one is the most secure, a software authenticator such as google authenticator or an USB device as Yubikey. ...
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2answers
12k views

How did someone log-in to my Gmail account from Kenya?

While on holiday in France in May I received an email from Google "New sign-in". Your Google Account was just used to sign in: Nairobi, Kenya. Tuesday, 26 May 2015 22:10 (East Africa Time). ...
5
votes
3answers
183 views

Does a Smartphone contain all the essential properties of a Smartcard? If not, what is missing?

Can a smartphone, alone, be a valid substitute for a Smartcard? If not, what is missing technically speaking? Does the TPM chipset (which I assume is in the phone) provide enough security to "act ...
2
votes
1answer
120 views

OTP on the same device being used to login

I've seen mobile apps use two factor authentication by sending an SMS to the mobile phone. However, if I've stolen someone's phone, where is the security advantage? I can understand it if it's used in ...
8
votes
3answers
324 views

How to securely store and manage one-time backup codes for 2FA?

I am already using 31 services with 2nd factor authentication and the number is growing. In addition to having multiple authentication devices, I decided for or had to generate a separate set of one-...
2
votes
1answer
100 views

Why is the 2nd step in two-step authentication not a single click? [closed]

The case I'm using Google 2-Step Verification. The question Why does Google use a code as second step? Why not just an android app where you can click "It's me"?
9
votes
3answers
326 views

What advantage does the Bloomberg authentication system have over traditional 2 factor?

Bloomberg clients have an interesting way to authenticate to the server. This seems involve some of the following: Logging into a secure website, that displays a flashing square Swiping your finger ...
5
votes
1answer
113 views

Storing base passwords in Lastpass

After watching Mr Robot I finally motivated myself to setup two factor authenitication for Lastpass with Yubikey. Fastmail is the second service I've set up with my Yubikey. I changed my main ...
0
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1answer
92 views

Google account 2FA only with HW security key?

Is it possible to configure 2FA access to a Google account using only HW security key (e.g. Yubikey) without verification SMS code option ? It seems that SMS confirmation code is still primary 2FA ...
2
votes
2answers
158 views

Is Google 2-factor “Remember this Computer” secure against adversaries with root access?

This question concerns the type of 2-factor authentication implemented by Google Accounts. The response to this question describes securing transfer of the secret key via a secure cookie. But what ...
5
votes
3answers
236 views

Authy: Does multi-device mode imply that all keys are stored on their servers?

My understanding is that if you use Authy, without backups/multi-device options, none of your account keys are stored on their servers. It all resides on your single device. Ie, even if Authy ...
6
votes
3answers
471 views

2-Factor Authentication vs Security Questions

I have an account with a bank that has additional security option. When it does not recognize a device being used to access the account, it will either: Prompt with 1 of 3 security questions Send a ...
2
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2answers
205 views

Why do popular sites like Google, Dropbox, etc. have a “trust this computer” checkbox when it weakens security?

Let's say someone is logging onto Dropbox in the library, but the computer has a keylogger on it that steals their password. Fortunately, they are using two factor authentication, which could have ...
4
votes
1answer
124 views

Are “Security SMS codes” any safer than plain SMS?

Many banking webapps send this kind of SMS, for their 2FA systems. These messages do not appear in the main "Messages" app, seemingly being destroyed after viewing - at least on iOS. Firstly, are ...
6
votes
1answer
149 views

How long does 2-factor authentication codes have to be?

I've noticed that from a (personal) UX point of view, 4 numbers which my online banking uses seems to be a sweet spot in terms of holding it in my head from looking at my phone to typing it it. But ...
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0answers
134 views

Is it possible to reuse a OTP Token with another security provider? [closed]

My bank issued a new security device replacing the Go 3 Security Token manufactured by Vasco and I would like to know if it could be used with my Google multifactor security or with LastPass as a ...
2
votes
1answer
148 views

How do banks determine when to ask for two factor authentication?

I was playing around with trying to figure out how my bank knows when to give me a two factor authentication prompt. I had originally thought it was based on my cookies and maybe my IP address. But ...
4
votes
2answers
406 views

Comparing the 2FA Vendors

If we need to choose a vendor for the 2FA in our environment, what are the features that we should look for? Our selection process depends on the functionality and usability they provide. But when I ...
2
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1answer
156 views

LastPass authentication grid hacked on June 15?

I wonder how safe LastPass's grid authentication is. I take it that they have a copy of the authentication grid on their server. You are supposed to print the grid and carry it with you to any device ...
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2answers
85 views

Importance of Lastpass User Vaults Statement and Two-Factor Authentication

The Lastpass breach statement reassures folks who had two-factor authentication enabled and recommends it for all users. I also note that they explain that there is no evidence that the encrypted user ...
2
votes
4answers
128 views

Justifying strong 1st factor in the context of multi factor authentication — beyond passwords

I am wondering if you need strong 1st factor (for theoretical correctness, please note it is the knowledge factor -- not necessarily a password, but definitely also includes strong passwords)? What ...
1
vote
2answers
58 views

Does using a token and a pin for logging into a corporate internal system removes the need for using regular user names and passwords?

I am evaluating an internal 2 factor authentication implementation in an organization. The system designer wants to remove regular user names and passwords from all user workstations such that each ...
2
votes
1answer
106 views

What happens when authenticating through a phishing attack with FIDO U2F tokens

So I have looked around and haven't found this anywhere. What happens when the response server is a phishing site with FIDO U2F tokens? Basically, if login just fails, I would assume that the user ...
5
votes
1answer
340 views

How secure is CertiVox M-PIN?

CertiVox have designed a system with the aim of "getting rid of passwords". Essentially the system authenticates users with two factors of authentication: A 4 digit PIN and a token stored within the ...
9
votes
2answers
3k views

How to fix a repeatedly hacked gmail account (where 2FA is enabled and passwords are changed)?

A friend of mine came to me for help with this issues. Her Gmail account has been hacked and keeps sending out spam emails to her contacts. This is happening to her on a monthly basis. Each time it ...
1
vote
1answer
254 views

How safe is Two Factor Authentication (TOTP)?

If someone gets my phone and saves the values my authenticator generates, will that person be able to find out the shared key, which he/she will be able to generate codes himself/herself? If so, how ...
1
vote
3answers
133 views

Securing a secondary login page for inputting a multi-factor auth token

I would like to implement the following use case: User lands on the login page User submits login credentials Credentials are validated and they are redirected to another page for inputting the ...
1
vote
3answers
70 views

Will having 2FA protect me on a potentially insecure network?

Whenever I browse to a Google site on my Library's network, I get this screen: Presumably this is so they can "protect" children (anyone with a library card who is under 13) from unsafe videos as ...
7
votes
3answers
296 views

Is there any point in using two step authentication if you have strong passwords?

If you are in the habit of using strong passwords (randomly generated by password manager) is there any point in using two step authentication? Assuming that 99% of the time that when you enter a ...
3
votes
1answer
53 views

Securing 2 factor data from apps that are co-located on the same device?

Several apps such as GMail, Coinbase, Yahoo and others require the use of the mobile device to gain access to the data within the app. For example Gmail requires TOTP in Google Authenticator (...
1
vote
1answer
181 views

How Google Authenticator in Android mobile identifies this is the right SSH server?

I am new to Google Authenticator mechanism. I have gone through the basics of mechanism but I couldn't understood the logic behind it to make a connection to the Linux machine. I have a Linux machine ...
0
votes
3answers
182 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 ...
0
votes
3answers
335 views

What is a good way to authenticate a user to websites and applications with a smart phone?

What would be a good way to authenticate a user to authenticate to websites and applications over a smart phone? By good, I mean that it is both secure, and user-friendly. Passwords don't seem to be ...
5
votes
2answers
379 views

How secure is a password app that stores both the password and two factor secret in one place?

Take for example 1Password, that now can store your password and one time password secret in a single place (your 1Password vault). I know it isn't truly two-factor anymore, but how much better is it ...
1
vote
0answers
2k views

Soft tokens - multiple profiles on same smartphone

Some of our clients have started migrating to soft tokens instead of hardware ones for two-factor authentication to their network. We have apps like RSA SecurID and VIP Access on our smartphones. The ...
0
votes
1answer
342 views

IP whitelisting as two factor authentication method for server access under PCI DSS

In the answer to my question: Two factor authentication for web application under PCI DSS gowenfawr stated: I have seen other methods used for 2FA than those you mention; IP whitelisting and ...
0
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1answer
550 views

Two factor authentication for web application under PCI DSS

PCI DSS 8.3 is stated as follows 8.3 Incorporate two-factor authentication for remote network access originating from outside the network by personnel (including users and administrators) and ...
2
votes
1answer
117 views

Is it sensible to use application password bypassing two factor authentication? [duplicate]

I discovered that some applications (like Sylpheed) seems unable to support two factor authentication. Google has a feature called application passwords - a separate password that "grants complete ...
0
votes
1answer
303 views

Revoke and regeneration in FIDO U2F / FIDO UAF

One of the benefits of using Software based Strong Authentication apps (e.g. RSA SecurID Software Tokens) is that if the device that is running the Token generation app is compromised or lost, the ID ...