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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32 views

Is using the 2FA secret on the same machine as using the credentials, removing one factor of 2FA?

In other words: Is saving or using the two-factor authentication (2FA) secret on the same machine to generate one-time passwords (OTP), breaking the two-factor authentication (2FA) concept since it's ...
2
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3answers
308 views

Multi-factor auth: implementing a “don't ask again for this computer” function

Many sites that support multi-factor authentication provide a "do not ask me again for this computer" option. I'm hoping to gain some insight into how this feature could best be implemented. My ...
9
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3answers
7k views

Does adding two-factor authentication by OTP really make KeePass more secure

KeePass is an application that keeps all your passwords for you in a database. It is primarily protected by a master password and/or keyfile. If the database is properly encrypted with that password ...
2
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3answers
89 views

What security does the new option for two factor authentication that Google offers enforce?

Google has announced a new option for two factor authentication - a popup message. How does this improve security?
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4answers
2k views

Which verification method should I choose: SMS or call?

I want to enable Two-Factor Authentication for my outlook account, but I'm not sure which method should I choose or in other words which method is more secure? Like I said there are two options: text ...
1
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2answers
65 views

Periodic password change needed when using 2-step verification?

I know that it's considered good online security hygiene to change one's login passwords every 6 months or so. Is that needed on sites with 2-step verification? Isn't the 2nd step what will keep my ...
-1
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5answers
160 views

Is it possible to bypass two step authentication process?

Is it possible for a hacker to bypass two step authentication process if the hacker has no physical access to my phone?
2
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2answers
80 views

For 2FA, is one method better (more secure) than another?

There are a variety of options available for 2FA - LastPass, for example, offers all of the following options: LastPass Authenticator Duo Security Authentication Google Authenticator Yubikey ...
8
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3answers
302 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-...
7
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2answers
126 views

Why not make the second factor the only factor? [duplicate]

Most websites use a single-factor based authentication mechanism, the password. Some popular websites, however, also implement an (often optional) two-factor mechanism to log in; usually requiring the ...
62
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5answers
5k views

Do 2FA sites leak info by confirming a correct password guess?

Here's my relatively layman's view of the issue. Many websites tout multifactor authentication (MFA) as an enormous boost to the security of users' accounts, and it can be if implemented properly. ...
2
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3answers
74 views

Additional confirmation for online bank payments

Nowadays, when someone is making an online payment, the associated bank often requires an authentication step. As far as I know, there are mainly two ways to do this: SMS Verification. The Bank ...
1
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1answer
68 views

Pro's and Con's of current 2-step-verification processes?

I am currently working on a project, and we are exploring different types of current industry MFA standards. The most known ones would most likely be HOTP & TOTP pins, which are used in the '...
6
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4answers
102 views

How can I protect my credit card on sites where 2FA is not an option?

I'm using Visa Express, and sometimes when I'm shopping, the store doesn't support Verified by Visa - so that means that there is no 2FA option. Normally when there is that option, it will force me ...
0
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0answers
45 views

TOTP: Storing symmetrical secrets

I'm in the process of researching 2fa methods for a cloud connected physical access control system. There is very little margin for error in this space. Is it just me or does TOTP for two factor auth ...
1
vote
1answer
175 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
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0answers
18 views

Is “full loop” and “half loop” authentication the right word to describe this 2FA sequence?

I'm looking for a term to describe this abstract thought about multifactor devices and how they are implemented. In the examples below, there are different levels of device authentication, but the ...
0
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0answers
27 views

From a credential flow perspective, whats the difference between FIDO UAF and FIDO 2.0 Web Services?

The FIDO Standard allows for devices and authentication schemes to be certified as UAF or U2F. This allows for flexible unified authentication, and optional second factor enrollment and registration. ...
15
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6answers
10k views

How to implement multi factor authentication using a token generator?

I'd like to implement multi factor authentication on a few projects. Now the first factor would be username and password, for the second factor I would like to use a token generator. These tokens ...
8
votes
2answers
2k 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 ...
75
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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). ...
0
votes
1answer
43 views

Protecting third-party credentials in a web database in light of weak passwords

I need to store third party credentials in a database for a web application. The third party supports OAUTH and I plan on getting a long-lived token to allow my app to access the third party, but I ...
1
vote
1answer
85 views

How is github 2FA personal access token more secure than passphrase?

I recently enabled 2-factor authentication (2FA) on my github account. Once you enable 2FA, you can no longer connect to the repo using your normal passphrase using command line tools. You have to ...
2
votes
4answers
266 views

What's the idea of two factor authentication? A hacker can use password with mobile

2-factor authentication means to enter MOBILE app (using username and password) and there you get code to enter your account from PC browser, right? But if hacker has my password, then he can enter ...
5
votes
3answers
220 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 ...
2
votes
1answer
60 views

Can I use Authenticator instead of phone number for Gmail 2FA? [closed]

I want to enable Two-Factor Authentication for my gmail accunt, but when setting this up it asks for my phone number. I don't have a phone (that I want to connect to Gmail), is there another way to ...
3
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1answer
126 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 ...
0
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1answer
81 views

Doesn't this make 2FA irrelevant and possibly dangerous?

Article. One sentence summary: they use a smartphone as a listening device to compromise computer security. I know our bank doesn't allow us to take cell phones in at all, even if they're completely ...
31
votes
3answers
30k views

How does HSBC's “Secure Key” actually work?

My bank has recently sent me a Digipass/Secure Key, which looks like a tiny calculator. You press the green button to turn it on, type a PIN to unlock it, then press the green button again to generate ...
2
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2answers
60 views

What is the safer Google account recovery option?

I have a Google account with a strong password and 2-factor authentication set up, and I worry about what would happen if I lost my phone with the 2FA app. I want to set up a recovery option, and I ...
1
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2answers
110 views

Hacked, is my IOS systems safe?Werid things? [closed]

I hope this finds you well. I wanted to thank you in advance for your time and patience with me, and my questions. I was Hacked by friends of an X-boyfriend from HighSchool. He was a Foriegn ...
4
votes
2answers
96 views

Out of band verification using phone; a fallacy?

More and more websites nowadays require new users to verify their 'identity' by requesting the user prove that he/she has access to a device identified by a telephone number (typically a phone). The ...
0
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2answers
71 views

Malware able to “read” one's screen

I was searching online about multifactor authentication. One of the reasons that people recommend it is because they fear someone may use a keylogger to "steal" their password, so they use one more ...
1
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1answer
24 views

How to reliably backup to cloud services without hampering security?

There is a huge number of articles advising to enable two-factor authentication on sensitive cloud services. I understand the benefits for my accounts' security, but doesn't it defeat the purpose of ...
5
votes
1answer
94 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 ...
2
votes
1answer
50 views

Accounts being accessed from X country

So recently I've been getting emails that X account has been accessed from Y country with an IP address that I obviously don't own. An example would be my Steam account which recently got accessed ...
1
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1answer
93 views

What are the privacy implications of using Yubico OTP with YubiCloud?

I am considering purchasing Yubikey devices (made by Yubico) to add two-factor authentication when my users ssh to our various servers. I figured I would configure the device to use Yubico OTP with ...
7
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3answers
143 views

Why do Google 2-factor authentication SMS codes never start with a 0? [closed]

When you use 2-step authentication to log to your Google Account, you can get an SMS on your mobile-phone with a G-123456 style code. I think that I never got a code with a leading zero. Is there a ...
3
votes
1answer
823 views

Is TextKey SMS 2 factor authentication secure against cell phone cloning?

I came across this website today that implements SMS based authentication that works "opposite" most SMS authentication methods. In typical SMS authentication, the provider sends you an access code ...
6
votes
1answer
312 views

How to solve race condition in 2-factor authentication solutions like RSA Security tokens or Google Authenticator?

One of the reasons we opt to use 2-factor authentication is to minimize the impact of keyloggers. The theory is that even if an attacker is able to observe the user type in the token numbers, they ...
3
votes
1answer
98 views

Relative merits of Yubico OTP vs. OATH-HOTP?

What are the pros and cons of using Yubico OTP vs. OATH-HOTP? They both seem very similar.
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 ...
5
votes
2answers
367 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 ...
6
votes
1answer
82 views

Are Push 2FA methods safe from Android and iOS 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 ...
8
votes
5answers
11k views

What are the ways to implement two factor authentication?

We have devices that can generate tokens. So we can use tokens with passwords to perform two factor authentication. There are many ways to implement such systems to enhance security. One of two I know,...
0
votes
5answers
749 views

SSH server: What's more secure, pub key auth or Google Authenticator time-based auth?

I'm curious which would be more secure, pub key authentication or 2-factor auth via Google Authenticator. Apparently I can't use both. If I have pub key authentication, the Google Auth PAM module ...
2
votes
2answers
76 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 ...
4
votes
6answers
319 views

When should I issue more than one multi-factor device to a user? Is it OK to give several active tokens vs none at all?

Most of the conventional IT.Sec thinking I've seen says that a user can only have one multi factor authentication device. I'd like to challenge that defacto-thinking and ask if there is ever an ...
7
votes
3answers
285 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 ...