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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4
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0answers
34 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 ...
7
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1answer
77 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
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1answer
154 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 ...
37
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4answers
9k views

How secure are the FIDO U2F tokens

Google and Yubico just announced the availability of cryptographic security tokens following the FIDO U2F specification. Is this just another 2FA option, or is this significantly better than solutions ...
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0answers
46 views

Google “App Passwords” - Do these circumvent 2FA?

I recently discovered Google's "App Password" feature: https://support.google.com/accounts/answer/185833?hl=en I generated a password there and used it in a Python script to authenticate with Google ...
2
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1answer
85 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 ...
3
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7answers
340 views

Why not ask for a password and 2-factor token at the same time?

I have observed a number of web-based login forms that offer 2-factor authentication do token entry on a second form after validating your username and password. Is there a reason not to ask people ...
1
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3answers
77 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
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2answers
230 views

Two-factor port-knocking via SMS (TXT)

It seems to me that a useful alternative or supplement to traditional port-knocking, fwknop, etc, for a system requiring only occasional access, would be to: Set up a one-time pad of keys, and a ...
1
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2answers
922 views

Could “receive SMS online” site be a scam?

There is a site that allows you to see all SMS received by a certain set of phone numbers (owned by the site). This seems to be meant for services that require two-factor authentication using SMS, ...
3
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1answer
38 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
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3answers
54 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 ...
3
votes
2answers
115 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 ...
9
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2answers
984 views

How does Google detect new devices for two factor authentication

When you enable two step verification for google accounts, you get sent a code by SMS to enter in addition to your username and password the first time you log in with a new device. How do they ...
0
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0answers
37 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
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3answers
133 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 ...
0
votes
1answer
59 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
105 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 ...
21
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12answers
3k views

Why do we even use passwords / passphrases next to biometrics?

In the last couple of days there were a lot of talking about passwords and passphrases, not only here, but on several blogs and forums I follow (especially after XKCD #936 saw the light of this ...
1
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0answers
104 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
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1answer
105 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
88 views

Two factor authentication for web application under PCI DSS

PCI DSS 8.2 is stated as follows 8.2 In addition to assigning a unique ID, ensure proper user-authentication management for non-consumer users and administrators on all system components by ...
2
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1answer
58 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
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1answer
142 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 ...
20
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2answers
5k views
7
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2answers
1k views

How do I block LinkedIn from extracting data from Microsoft Exchange Server?

LinkedIn now offers the ability to take a real user and password from the end user and connect to Exchange Server for the purpose of importing contacts into their system. (To do this yourself, click ...
0
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1answer
357 views

What regulations *require* multi-factor authentication?

What industries require multi-factor authentication? Please include the following information: Country Industry Regulation name Additional information as you see relevant. Some additional ...
1
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1answer
162 views

Best practices for usefully storing two factor authentication backup codes?

For a lot of web services offering two factor authentication, after setting up the system, you are given a short list of backup codes (one-time pads) that are around 7-10 characters long. These are ...
4
votes
3answers
137 views

2-factor authentication - Who am I trusting?

I'm confused about the risks of 2-factor authentication. I'm a developer, who has to do some ops, and considering turning it on for my DigitalOcean and GitHub accounts. Both offer TOTP(?) and ...
10
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1answer
449 views

Yubikeys & SSH - which option is best for lockdown?

My company has a few dozen servers hosted on a cloud provider. All but one (OpenVPN host) is closed to the internet. We're using OpenVPN AS which uses certs + Google Authenticator for login. We are ...
2
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0answers
125 views

Remote Registry allows bypass of 2FA enforcement with 1FA

Some organizations will configure their Windows systems to require Smart Cards for all account logins, as part of a two-factor authentication implementation. However, this can easily be bypassed ...
3
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1answer
748 views

what is a valid challenge for 2 factor authentication?

When designing password reset process: 1- Is a an email address or an assigned username a valid piece of information ( identifier) to ask for in two factor authentication? 2- How does two factor ...
2
votes
2answers
271 views

How can LastPass enforce 2-factor authentication

I've recently started using LastPass and one of the things you can set as a policy for you password vault is Prevent offline access when using Google Authenticator. The local cache can be ...
0
votes
1answer
224 views

What are the pros and cons of enabling 2 factor authentication on internal user workstations of an organization?

An organization has all the regular controls you can think of for network and systems protection from the 10 security domains. External login access to the organization's services is protected with 2 ...
5
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3answers
4k 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 ...
3
votes
2answers
85 views

Should a 2FA recovery key be stored along with a password?

Many websites give you a recovery key or a list of recovery codes that can be used in place of 2FA tokens if you lose your phone or can't access your token generator. What are the recommended ...
0
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1answer
71 views

Are 2FA soft-tokens flawed if the user can log into the website from the same mobile device?

If I'm using something like Authy for soft tokens for my users, and they log into the web application on the mobile device itself, haven't they just lost the benefit of 2FA (ie loss of the mobile ...
6
votes
1answer
1k views

What are the differences between the U2F and UAF FIDO authentication standards?

Google recently announced support for Universal 2nd Factor (U2F) authentication in Chrome and started allowing that authentication mechanism to be used for 2-factor authentication across their various ...
57
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6answers
6k views

Four-factor authentication

I'm sure you've all heard of two-factor/multi-factor authentication. Basically it comes down to these factors: Knowledge - something you know (e.g. password, PIN, pattern) Possession - something you ...
19
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4answers
1k views

Why use a Smartcard for (Two Factor) Auth instead of another medium?

I recently installed Bitlocker on my Windows 8.1 machine, using only a password. I was thinking of getting something other than just a password for my storage drive, something physical, like a USB, SD ...
1
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1answer
66 views

Is selecting trusted computer in 2-step verification less secure?

In using 2-step verification, does selecting 'Trusted Computer' a less secure options? https://support.google.com/accounts/answer/2544838?hl=en If so, is it still a reasonably secure option?
0
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5answers
350 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 ...
4
votes
3answers
256 views

How to evaluate different solutions for security tokens?

According to my own experience, most companies selling security tokens for authentication like RSA, Verisign or Aladdin share little information about the internals of their products like algorithms ...
-1
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1answer
47 views

Can OTP 2FA be reversibly determined?

Please note: I'm not necessarily talking about what happens when one shoulder surfs someone inputting a OTP. I'm fairly confident that it's nearly impossible (or extremely impractical) to guess the ...
3
votes
2answers
3k views

How does Authy's 2FA work, if it doesn't connect to the server?

I thought I knew how two-factor authentication works: I enter the password. Server generates a random number (token) and sends it to me via SMS. I enter this token. Server checks that the token I ...
9
votes
2answers
1k views

How do I protect my Gmail account when accessing it via an Android smartphone?

I have a Gmail account that I also access via an Android smartphone. The mail account could be used to reset passwords for other online accounts, so I want to tighten up the security around this ...
2
votes
1answer
650 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 ...
0
votes
4answers
213 views

Isn't it less secure to use something you are for authentication?

I have to think of this everyday when I close the doors of the shop I work in: A year ago we used to close the shop and arm the alarm using a key fob. This means the worst case scenario was that I ...
9
votes
4answers
283 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 ...
2
votes
2answers
109 views

Where can 2-factor fail in Google?

I was one of the people who thought that enabling 2-factor in Apple would have prevented the download of images from iCloud; it was recently pointed out to me that, in fact, I was gravely mistaken. ...