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Questions tagged [authentication]

the process of establishing the authenticity of a person or other entity. Not to be confused with authorization - defining access rights to resources.

10
votes
6answers
11k views

One Time Passwords. Using OTP at Windows, Ubuntu and internet sites

my question is this: Is there a way (software,hardware/token or web-ware) to use One Time Passwords in the following scenarios: Logon to my pc/laptop (windows or ubuntu) Logon to sites with OTP (...
11
votes
5answers
1k views

Non-OEM Biometric Software?

Most of us with fingerprint readers and such devices probably use the software provided by the vendor, to enable biometric OS login or single sign-on functionality. However, I've recently wondered if ...
6
votes
2answers
770 views

How can I authenticate a client connection in a secure way?

Let's say I have a server listening on port 1234. I have some client software that needs to be able to connect to this port. But I want to prevent malicious users from bypassing the client software ...
23
votes
5answers
2k views

Why do some websites and programs restrict password characteristics?

There are some websites and even programs that I use that have ridiculous password restrictions. Lots of forums for instance restrict passwords to ~32 characters. Others enforce a restricted charset. ...
5
votes
2answers
5k views

Dealing with expired or revoked signing certificates with Infopath documents

Suppose I have an Infopath form that is digitally signed today by a valid, and active user. When that user leaves the company, we disable the account and revoke the certificate. This causes a problem ...
91
votes
4answers
96k views

What is the difference between an X.509 “client certificate” and a normal SSL certificate?

I am setting up a web service through which my company will talk to a number of business customers' services. We will be exchanging information using SOAP. I would like to handle authentication with ...
8
votes
3answers
9k views

What common products use Public-key cryptography?

I want know what common use products are there that use public key/private key cryptography?
126
votes
10answers
251k views

Where can I find good dictionaries for dictionary attacks?

I’m wondering where I can find good collections of dictionaries which can be used for dictionary attacks? I've found some through Google, but I’m interested in hearing about where you get your ...
8
votes
2answers
2k views

Storing third-party auth info securely

Suppose there's a multi-user web application that requires access to user's mailbox (on third-party service, like gmail, etc.). This access needs to be persistent. Which means we'd have to store user ...
7
votes
4answers
3k views

(SoHo) Multi-Factor Authentication for Remote Desktop Gateway

I am looking at implementing some sort of multi-factor authentication for a Remote Desktop Gateway at a small office (less than 20 users). Where would be a good place to start for a quality, ...
8
votes
1answer
1k views

What were the specific security flaws with OAuth 1.0? How are they being addressed in 2.0?

I read an article documenting Twitter abruptly pulling its OAuth support back in April 2009. The article said it wouldn't specify the hole for security reasons, but mentioned "social engineering" is ...
21
votes
3answers
478 views

Isn't openid with http an issue?

Many openid enabled sites default to http identifiers, even if the openid provider supports https (such as myopenid.com). Does this pose a threat beside the identity being exposed? The second step of ...
271
votes
8answers
154k views

Is BASIC-Auth secure if done over HTTPS?

I'm making a REST-API and it's straight forward to do BASIC auth login. Then let HTTPS secure the connection so the password is protected when the api is used. Can this be considered secure?
22
votes
8answers
2k views

How to protect against brute forcing

How do you properly implement defenses against brute forcing? Is it best to store how many times someone tried to log in and block them after X attempts? And how would "someone" be identified? With ...
21
votes
6answers
24k views

How to set up a single sign-on for multiple domains?

I've set up a single-sign-on for two of our sites that live on the same domain: a.domain.com and b.domain.com I did it through cookies, but they are domain-dependant. And - as it is written in the ...
12
votes
5answers
6k views

How can I securely authenticate the client application sending me data?

We have a web service logging/recording user data sent over https by our client application. Is there a way to securely ensure that the data is getting sent by the client application and not by a fake ...
29
votes
7answers
3k views

How to secure a WiFi network?

What do I have to do to secure a WiFi network? Is there any best practices? I have been recommended to use WPA2 encryption on the router, is that enough? What can I do to improve the security even ...
19
votes
2answers
28k views

How does basic HTTP Auth work?

How does basic HTTP Auth work?
2
votes
2answers
7k views

Is it possible to change the admin user/password remotely on a router without logging in? [closed]

Is it possible to change the admin user/password remotely on a router without logging in? If yes, how so?
17
votes
3answers
2k views

Multi factor authentication on Ubuntu workstations, where to start?

Is it possible to have Ubuntu users log in with multi-factor authentication? I was thinking of a combination of pass(word|code) and smartcard (with screen locks when for example smart-card is removed) ...
3
votes
2answers
260 views

How does LiveID work? Is there any documentation on the LiveID provisioning site msm.live.com?

I'm trying to learn details on how LiveID works, when compared to other federation technologies. To be honest, I'm a bit overwhelmed by all the options at https://msm.live.com/ and want to understand ...
7
votes
2answers
7k views

What is the exact difference between SAMLp and WS-Trust?

They seem to be similar on the surface, but I'm not sure how deep the differences are. Can someone explain to me the difference between SAMLp and WS-Trust? ADFSv2 gives me a choice between these ...
6
votes
2answers
398 views

How is the password prompt going to protect me from ruining my computer?

On Unix based systems, I'm often prompted to enter my password before installing or running a program. Why does this protect me? If I'm running a kiosk, I understand that a password might prevent ...
6
votes
2answers
933 views

How effective is the Mac Open Firmware password protection?

I have used Mac's Open Firmware password protection before and I've always wondered how effective it actually is at protecting my stuff. [assuming a good password] Would does the firmware password ...
10
votes
1answer
371 views

What shell binary should I use for the root account on a Linux system?

Is there a security advantage to using a different shell for the root account, either a hardened shell program, or simply a shell binary stored in a non-standard location?
10
votes
1answer
958 views

How to properly generate and use (m)TANs?

If you have an application that uses transaction authentication numbers (TAN) or mobile TANs, how do you generate them correctly? What are the pitfalls? And should you only allow the next number on ...
11
votes
3answers
1k views

If I am obliged to store a password/certificate on a client side, how can i make sure that it is protected?

In certain cases we need to establish a key/password/certificate as a first timer and then as a client we need to use this key/password/certificate to get authenticated. Therefore the key/password/...
23
votes
4answers
2k views

How does using OpenID affect webapp security?

Using OpenID for authenticating users grows in popularity and, in fact, makes a webapp easier to use. But what are the security considerations one should bear in mind when deciding whether to ...
20
votes
1answer
3k views

Is it secure to connect to a remote Windows Server using Remote Desktop only?

I have a Windows Server that I login to from my home. I only use the pre-installed Remote Desktop. Is this a secure way to remote login or should I improve it in some way? If I should improve it, ...
55
votes
6answers
15k views

How to Securely Implement a “Remember Me” Feature?

Assuming you already have a website that implements all of the standard login stuff, what is the correct and most secure way to allow users to automatically be logged in for a certain time period (let'...
22
votes
5answers
3k views

Good session practices

What are some good practices for ensuring logins, session IDs and session content are secure for a website?