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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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 ...
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1answer
36 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 ...
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1answer
30 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 ...
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1answer
45 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 ...
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1answer
38 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 ...
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1answer
47 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
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3answers
101 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 ...
2
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0answers
63 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 ...
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1answer
718 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 ...
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1answer
81 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 ...
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2answers
49 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 ...
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1answer
50 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 ...
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4answers
2k 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 ...
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1answer
59 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?
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1answer
450 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 ...
0
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5answers
158 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 ...
29
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4answers
5k 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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1answer
36 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 ...
10
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1answer
277 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 ...
55
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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 ...
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4answers
253 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 ...
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2answers
104 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. ...
14
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6answers
1k views

Additional security benefits from Multi-Factor Authentication?

Does multi-factor authentication provide any additional security benefits on top of doing a better job at correctly identifying and authenticating users compared to single factor authentication? In ...
9
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5answers
494 views

Is a biometric eye scan more secure than a multi-factor authentication

I have come across the following question in a Security+ exam guide You are tasked with creating a high-security authentication system for physical access control to a military installation. Which ...
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2answers
87 views

Are there any flaws in my design for a paper-based OTP grid?

I'm trying to implement two-factor authentication on the cheap for a website of mine. My bank uses this sort of grid-based OTP system, so I wanted to emulate it in my application: Cards are ...
2
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2answers
233 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 ...
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1answer
260 views

Do non-browser clients work around Gmail's 2-factor authentication?

If you use a client like mutt to access your mail, you probably know that it doesn't support 2-factor authentication. It still prompts only for a password - either your account password or, in the ...
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0answers
61 views

Generating backup codes for a 2FA implementation

I have implemented the login/verification aspect of a two factor auth system as per RFC 6238. It works fine with Google Authenticator, which is great. Now I am turning my attention to the backup ...
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1answer
31 views

How VIP card helps in verification? [duplicate]

How does the 6 digit randomly generated security code from (disconnected) Verisign Identity Protection card help in verification/validation of any user? Why one cannot enter any random 6 digit ...
3
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3answers
165 views

Is login limiting still needed if we employ multi-factor authentication?

The status quo is that most online websites limit login attempts per IP address, or even per account since some attackers possess huge amounts of IP addresses. OWASP declares: When multi-factor ...
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1answer
41 views

Does RADIUS allow for eventual, gradual adoption of 2 Factor auth in an AD Environment?

We have several applications that leverage AD SAML (via Ping Federate) LDAP authentication from 3rd party applications Windows workstation / Exchange auth (Kerberos) IIS and web components ...
2
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3answers
134 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 ...
0
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2answers
173 views

Creating port-specific SSH authentication for the same user

I have a Linux server running SSHD and would like to know if its possible to configure it, such that from within the LAN you only need a RSA key to authenticate (on port X), but from outside the LAN ...
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2answers
666 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, ...
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3answers
85 views

Is it ok to use the same password for many services with two-factor authentication?

Let's say that I've a relatively strong password, but I don't want to use many different passwords for each different service, and let's say that those services provide two-factor authentication using ...
10
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2answers
1k views

LastPass Grid Authentication vs Google Authenticator which one is more secure?

[Being a LastPass user] recently I moved to Google Authenticator instead of using Grid Authentication as a 2-factor security. For me, finding and filling letters from such a dense matrix is a rather ...
2
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2answers
149 views

Does Google 2-step verification protect user from session hijacking?

After signing in Google 2-Step verification scenario, user should enter verification code which sends to his mobile. Without it, he couldn't access to Gmail account. Consider an attacker does session ...
3
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6answers
291 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 ...
11
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2answers
1k views

Does having 2-factor authentication help with HeartBleed?

I was talking with a friend about HeartBleed, and he mentioned that he had 2-factor authentication enabled on all the sites that supported it, so even with his username and passwords, nobody would be ...
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0answers
40 views

Is there a TOTP variant that does not require the user to type in a code? [closed]

We're considering a 2 factor TOTP solution on a mobile phone. However, it would be much easier for the user to somehow send the OTP to the server by pushing a button, rather than manually typing in a ...
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1answer
59 views

Is it applicable to use Google Authenticator against TEMPEST?

I would like to know about Multi-Factor Authentication is applicable for TEMPEST or not. Why I'm asking is I have suspicious matter every day also captured as log. My concern: It's possible to ...
0
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1answer
129 views

Using Gmail in China triggered lots of Two Factor SMS

A friend of mine lives in Hong Kong and she travelled to China over the weekend. Whilst there, she was able to use Gmail on her Android phone without logging in again, but she had to re-login on her ...
3
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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 ...
2
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2answers
69 views

HOTP/similar - how about standard backups of mobile devices?

I was considering adding HOTP as an option to my website (alongside things such as SMSed one time tokens which I already have). But I was considering one issue that HOTP inherently has: Things such ...
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1answer
266 views

How can I succesfully pentest site with two factor authentication? [closed]

I want to use a commercial, automated tool but it cannot login successfully because the website requires a two factor authentication process using SMS. For testing, the SMS message is sent to another ...
4
votes
3answers
440 views

Does Google/Dropbox/Github Two-Step Verification count as Two-Factor?

This considers the route where somebody does not use the SMS option, but rather using TOTP, and the site offers a generated seed to input. Two factors questionably at use: password: something KNOWN ...
0
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4answers
203 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 ...
0
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1answer
152 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 ...
32
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2answers
2k views

Why does Google cripple the 2FA Google Authenticator PAM module?

If you enable 2FA for Google Apps the shared secret is 160 bits. The google_authenticator PAM module on the other hand seems to use 80 bits for the shared secret. According to RFC 4226: R6 - The ...
0
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1answer
56 views

Securing data on a mobile device (even from the user/owner)?

I am writing an application to generate OTP codes for two factor authentication where I need to securely store data locally. This data must be secure from both the owner/user as well as intruders. I ...