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)

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2answers
32 views

Is email OTP improving the security for 2 phase authentication?

There has been similar questions before where people say that using some other means (sms, hardware devices, etc.) is a more secure way to provide 2 factor authentication. Provided we don't have an ...
5
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1answer
37 views

Are Push 2FA methods safe from Malware?

I am doing a survey on various 2FA solutions, and recently I came across “Push” 2FA (e.g Duo Security). In this solution, the site (e.g. a banking site) pushes a notification to the user’s mobile ...
4
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0answers
49 views

Can I use a satellite phone for 2 factor auth sms and such?

Would 2 factor authentication SMS messages or other kinds of internet security notifications work with satellite phones? E.g. companies like Google, Paypal, Facebook, banking institutions and others ...
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2answers
84 views

Does two factor authentication increase the attack surface?

Would adding two factor authentication to an application increase the attack surface of this application? I think it would, since by adding complexity the likelihood of a vulnerability in my ...
0
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1answer
39 views

2 step authentication hybrid

I'm all forward on 2 step authentication. I understand how it is way more secure than a simple password. However I'm always afraid to start using it because I believe that in some cases I could be ...
1
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0answers
71 views

Steam two-factor authentication algorithm? [closed]

I'm all on-board that Value is recently pushing for two-factor authentication on Steam accounts. I'm not happy that they force you to use the Steam mobile app because both on iOS and Android, it's a ...
10
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3answers
779 views

Steam and two-factor authentication

The Steam platform is designed to encourage users to use two-factor authentication. One of the community tasks (achievement-like objectives) on Steam is "Use the Steam Mobile App for two-factor ...
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1answer
37 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
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2answers
63 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
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2answers
96 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 ...
3
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1answer
40 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
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1answer
216 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
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2answers
120 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
71 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
248 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 ...
8
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5answers
300 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
46 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 ...
4
votes
1answer
155 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. ...
72
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2answers
11k 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
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3answers
144 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
71 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 ...
5
votes
2answers
167 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 ...
2
votes
1answer
92 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"?
8
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3answers
238 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 ...
3
votes
1answer
88 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 ...
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1answer
71 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 ...
3
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2answers
123 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 ...
3
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2answers
132 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 ...
5
votes
3answers
172 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
181 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 ...
3
votes
1answer
116 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 ...
5
votes
1answer
129 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 ...
3
votes
0answers
96 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 ...
1
vote
1answer
121 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 ...
3
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2answers
228 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
votes
1answer
120 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 ...
1
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2answers
75 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
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4answers
117 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
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2answers
54 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
83 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
279 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 ...
6
votes
1answer
1k 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 ...
2
votes
1answer
188 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
117 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
67 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 ...
6
votes
3answers
272 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
51 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 ...
0
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0answers
56 views

Additional security for services hosted on a 2FA or Multi-Factor Authenticated Network

I am aiming to lock down a web service that accesses other services and has a publicly facing UI. I have a hosted service on a network that requires 2-factor authentication to access. This service's ...
0
votes
1answer
140 views

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

I am new to Google Authenticator mechanism. I gone the basics of mechanism but I couldn't understood what logic behind that to make a connection to the Linux machine. I have a Linux which have no ...
0
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3answers
157 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 ...