Tagged Questions

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

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4
votes
2answers
1k views

How do Azure ACS 2.0 security features compare to ADFS 2.0?

I'm configuring my relying party (a website) to use either ADFS or Azure ACS 2.0. ADFS 2.0 has some interesting features such as Token Replay prevention (in the SQL version) and may have other SAML ...
41
votes
4answers
12k views

What is the use of a client nonce?

After reading Part I of Ross Anderson's book, Security Engineering, and clarifying some topics on Wikipedia, I came across the idea of Client Nonce (cnonce). Ross never mentions it in his book and I'm ...
13
votes
5answers
1k views

How should passwords be stored if they must be recoverable?

By "encrypting" passwords you are violating CWE-257: Storing Passwords in a Recoverable Format. But this is exactly what the French government wants. They want to be able to obtain the passwords of ...
2
votes
3answers
227 views

Identify client based on computed hash

I'm currently developing a web application which will serve data to iPhone clients. In order to be the owner of the data, I don't want other clients to be able to get it. I thought I could use a ...
27
votes
3answers
3k views

Is there any advantage to splitting a password?

I've been reading about the LANMAN (LM) hash and I'm curious about a particular part of the algorithm. The LM hash is computed as follows: The user’s ASCII password is converted to uppercase. ...
4
votes
3answers
655 views

Is it possible to have authentication without state

In order to login to most websites you need a username and password which is often stored in a SQL database. You are storing per-user information that can change, this is state. Can you prove that ...
1
vote
1answer
437 views

OpenSSO and Basic Auth together

Our project is moving towards OpenSSO, but we have some CGIs that are accessed via web services. For example, one CGI locates files on the server and supplies them to the client. I understand that ...
13
votes
9answers
738 views

Anybody have additional information on the EMC RSA SecurID compromise?

The Security Advisory Press Release here doesn't have much information, the email that alerted me to this didn't help much more, and unfortunately I heard about the two Thursday evening conference ...
4
votes
2answers
881 views

P3P HTTP Headers and Session ID's

Is there any chance that Session ID's can be shared between different websites (one in other IFRAME of others) through P3P Headers?
6
votes
3answers
966 views

Is there a way to accept signed requests without storing client's password in plaintext?

We are developing REST Web service. We will give Identifier and Secret string to each of our REST clients. When doing requests, clients will authenticate themselves using HMAC algorithm (they will ...
12
votes
3answers
340 views

Verifying server software integrity?

I'm trying to brainstorm a security scheme for the problem of verifying server software integrity. The domain of this problem is Game Servers built on Valve's Source Dedicated Servers. These servers ...
19
votes
3answers
1k views

Why do some sites block pasting into username or password input fields?

I use a few websites that prevent me from copying & pasting into the username or password fields. It's quite frustrating when using a password manager, and if anything I'd think it discourages ...
10
votes
9answers
1k views

Why do we authenticate by prompting a user to enter both username and password? Does prompting the password only suffice?

I don't know why do we authenticate by prompting the user to enter both username and password. In my mental model, prompting password only suffices. The reason is as follows: Assume there are x ...
17
votes
11answers
3k views

2 factor authentication - cost effective solution for a web startup

My local bank uses a 2 factor authentication where customers key in password AND a One Time PIN delivered via SMS to mobile phone OR from a security token device. I am doing a web startup in the ...
4
votes
2answers
175 views

What boxed solutions exist for taking care of Authentication? Mostly focused around websites

The Internet is generally plagued by websites that break basic rules of security, then there's a middle tier where website try to secure passwords... but they do it incorrectly. And finally, there's ...
4
votes
1answer
830 views

Blackberry + RIM Bluetooth-based Smart Card Reader

Has anyone used this Bluetooth based smartcard reader? (scroll to bottom) If so, what are your experiences with it? Can you tell me if it's possible to require only the presence of the card + card ...
5
votes
2answers
2k views

Reference implementation of C# password hashing and verification

Does anyone have a reference implementation (ideally 3rd party certified, or government approved) way one-way hash a password for C# and or Java? Ideally,I'd like to see something that includes a ...
3
votes
2answers
519 views

BlackBerry client authenticating to Java Web Service

I already asked this question at StackOverflow here: http://stackoverflow.com/questions/4970681/blackberry-app-security and was directed to this site, can anyone pitch in as to how I can solve this ...
5
votes
3answers
1k views

What authentication system (OpenID, Facebook, etc) permits Javascript-free and/or Cookie-Free operation?

I'm looking for an authentication system that relies on 3rd parties (ADFS, OpenID, SAML) but doesn't rely on cookies or Javascript... or at least can make them optional. My intent is to gracefully ...
9
votes
3answers
468 views

Are there any smartcard/hardware-tokens for certificate-based authentication which are easily destroyed?

It's all very well to use multi-factor authentication, but supposing you want to 'destroy a factor' so that in an situation where you are likely to be coerced to provide your passphrase, you can ...
9
votes
4answers
2k views

Is Facebook Connect or Twitter OAuth PCI Compliant?

We have a system that stores credit cards securely on file. We'd love to allow users to sign up using Facebook Connect or Twitter. Obviously this wouldn't be secure if we were trusting just any old ...
0
votes
3answers
2k views

3 way authentication

Can someone please tell me what does 3 way authentication mean? I cannot understand this concept? :( Now if there are two people A and B 1.) A challenges B with a question 2.) B gives the answer and ...
10
votes
3answers
3k views

How does an SSL server prove its identity?

This document says that a challenge response authentication proves the servers identity. But is a man in the middle attack still possible if the client does not verify domain name ? Please help me ...
26
votes
4answers
14k views

How to achieve non-repudiation?

If I have a message that I need to send to another person, how do I achieve non repudiation ? Is digitally signing the message sufficient ?
6
votes
3answers
984 views

Safe implementation of sharing encryption secrets (username, password) in the cloud

I'm building a multi-tenant (cloud) environment that needs to push out (or make available for download) configuration files for agents (background services) that receive this information. One of the ...
46
votes
4answers
11k views

Is posting from HTTP to HTTPS a bad practice?

Working on the assumption that SSL serves both to encrypt data and to provide assurance as to the identity and legitimacy of the website, should the practice of providing a logon form on a page ...
18
votes
4answers
943 views

Biometric versus other Two Factor Authentication Mechanisms

Over the years biometrics is the go-to movie authentication mechanism, but in the real world I'm getting conflicting opinions about it. Everything I've learned shows that biometrics are flawed ...
0
votes
0answers
268 views

Is there software available for two-factor, biometric authentication to the OS?

Many fingerprint readers and other biometric authentication devices come with software for single-factor authentication to the OS. Is there any third-party software (F/OSS or otherwise) available for ...
8
votes
6answers
7k 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
710 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
504 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 ...
19
votes
5answers
1k views

Why do some websites and programs restrict password characteristics?

There are some websites and even programs that I use that have rediculous password restrictions. Lots of forums for instance restrict passwords to ~32 characters. Others enforce a restricted charset. ...
5
votes
2answers
2k 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 ...
45
votes
4answers
33k 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
3k views

What common products use Public-key cryptography?

I want know what common use products are there that use public key/private key cryptography?
59
votes
8answers
96k 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 ...
5
votes
2answers
719 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
2k 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
775 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 ...
19
votes
3answers
383 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 ...
77
votes
7answers
31k 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?
18
votes
8answers
1k 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 ...
15
votes
6answers
8k 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 ...
10
votes
5answers
2k 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 ...
21
votes
6answers
1k 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 ...
5
votes
1answer
9k views

How does basic HTTP Auth work?

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

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

Is it possible to change the admin user/password remotely on a router without logging in? If yes, how so?
16
votes
3answers
1k 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) ...
2
votes
2answers
200 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 ...
3
votes
3answers
2k 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 ...