Linked Questions

27
votes
10answers
10k views

Can IP address be a component of 2-factor authentication?

I have a bunch of Linux machines that I wish to administer over the Internet. I currently use SSH keys, but have been advised to use 2-factor authentication. SSH Keys are something you know. Is an IP ...
26
votes
14answers
6k 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 world)....
12
votes
5answers
5k views

Confusion: Why isn't a passhrase encrypted SSH key two factor auth?

I'm trying to figure out the best practices for accessing my devbox from a public terminal. Most sources I've found recommend protecting the box with some kind of two factor authentication, such as ...
12
votes
8answers
21k views

Is it possible to steal money directly from the systems of a big bank?

Sometimes I imagine: My money in the bank is just a floating point number in a mainframe's memory... So, if I just change 1 bit, I will win a lot of money... The most common way to steal money in ...
10
votes
7answers
523 views

Aren't permanantly logged in accounts inherently insecure?

The basic premise behind a "keep me logged in until I log out" feature is a cookie is stored with some identifier that is used to log the user in again when returning to the site. While these ...
8
votes
3answers
2k views

How does LastPass' grid multi-factor authentication work behind the scenes?

I understand how to use the Grid multi-factor authentication as a user but how does it work technically? Specifically how can just a few letters from the grid be enough to decrypt any secret defined ...
6
votes
3answers
908 views

What is the value in asking for a second password for sensitive operations?

When a user has logged in to a system using their primary password, is there any value in asking for a distinct second password when performing sensitive functions? Does it provide any benefit over ...
6
votes
2answers
1k 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 ...
4
votes
1answer
1k views

How many authentication factors are there?

The three classes that we all know and love: Something you know. Something you have. Something you are. I've also seen references to "somewhere you are". Is this really a fourth factor? How many ...
2
votes
4answers
3k views

Why does my bank use this verification method?

I hold my business account with Lloyds TSB [UK] and the process for logging in to their online banking service(s) is as follows: Login page Enter customer number Enter password Put debit card into ...
1
vote
1answer
888 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 ...