Questions tagged [authenticator]

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Two factor verification apps IOS

I have an iPhone XR with the latest updates. I use Microsoft Authenticator for some 2 step verification for work related stuff. Today I enabled the Instagram two factor security option and choose the ...
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1answer
102 views

How safe is my login system (conceptually)?

I implemented a 2FA authentication for a web app with PHP and Google Authenticator. In order to login to my system there are a few steps: User types in a complex master password in order to access ...
2
votes
2answers
430 views

How do backup codes work in TOTP, like Google Authenticator?

My understanding is that in TOTPs are like HMAC where code is derived from time. However, I am struggling to understand the concept of Backup Codes in Google Authenticator, and how are they ...
0
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1answer
52 views

What security considerations should be made when choosing a universal authenticator app? [closed]

The USPTO has two-step authentication: recommended applications comprise: Google Authenticator Microsoft Authenticator Oracle Authenticator Assume that I use my Gmail address as the USPTO username. ...
1
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1answer
148 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 ...
0
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1answer
138 views

Which party stores the link between user and device in WebAuthn?

Looking at the online resources regarding WebAuthn, I still haven't been able to figure out which of the involved components (or parties) that store the link between the user and his/her authenticator ...
0
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1answer
89 views

How does DUO push button method and other methods actually work?

Google authenticator uses HOTP and TOTP algorithm for TFA. What is the basic working principle of DUO push? What brings security to DUO push?
1
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1answer
697 views

How does Google Authenticator interact with apps on an iPhone?

I am clear on how Google Authenticator works when logging on to a website and I am clear on that. However, these days everyone is using apps for everything. The Twitter app, the Facebook app, the ...
6
votes
2answers
940 views

Do all Authenticator Apps use the same algorithm?

I've tried some Authenticator Apps (Google,Microsoft,Authy,Lastpass,...) and all of those apps generate same one time passwords at the same time ? So, these apps are use the same algorithm which is a ...
3
votes
1answer
163 views

Having sudo mode in a web application, why use a password instead of one time passwords?

Online services, like GitHub, have Sudo mode. Sudo mode means, that a user performing delicate actions has only to authenticate every couple of minutes, but than again, although they are already ...
20
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3answers
210k views

Where to find Google Authenticator backup codes?

I'm slightly confused about obtaining Google Authenticator backup codes. I can find my Google Account backup codes at: https://myaccount.google.com/signinoptions/two-step-verification But have no ...
0
votes
4answers
137 views

What is a good method to authenticate users and make sure they don't give their credentials to someone else?

I'm new here I hope this is the right place to ask this question, I work at a call center and I've been asked to create a TimeClock system however we have the problem that agents share their ...
1
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0answers
42 views

Does producing TOTP tokens weaken the stored secret? How much? [duplicate]

I am using Google Authenticator as a second factor on some sites, (including my Google Account). Every now and then I need to produce a token to log in. If some attacker received those tokens over ...
6
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6answers
389 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 ...