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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5
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2answers
84 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 ...
1
vote
1answer
18 views

Communication between two open endpoints, is this secure enough?

I'm building a (very simple) tool to communicate between two servers. I started by asking if there was a better alternative than making a home made scripts and we came to the conclusion that for ...
156
votes
7answers
26k views

What's the rationale behind Ctrl-Alt-Del for login

Why is Ctrl+Alt+Del required at login on certain Windows systems (I have not seen it elsewhere, but contradict me if I'm wrong) before the password can be typed in? From a usability point of view, ...
27
votes
7answers
2k views

If I include a Forgot Password service, then what's the point of using a password?

I've implemented a Forgot Password service in the following way: User goes to login page, clicks on "Forgot password?" User is presented with a form that asks for their email address. Email is sent ...
0
votes
1answer
58 views

Should I use HMAC in this situation

I need to store a big message encrypted on a server. What I am about to do is: Encrypt the message with a AES key; (Authentication) Hash the message with SHA512 and encrypt the hash with RSA priv ...
18
votes
2answers
514 views

What attacks, if any, are possible against Security Support Provider Interface (SSPI)?

I've been looking at SSPI recently, as it is used for authentication in a variety of Microsoft products. From the looks of it, it's based on GSSAPI and provides an abstraction for wrapping various ...
0
votes
2answers
71 views

Recovery plan in case of lost Android smartphone with Google Authenticator?

So I am using Google Authenticator as my two factor authentication. I'm not a security expert, but I was thinking late last night as I was about to fall asleep: How can I login to my favourite ...
0
votes
1answer
49 views

Understanding Digital Signature

I have just learned Digital Signature and am trying to ensure that I have got my understanding of Digital Signature on the correct track. Assume Alice wants to send a message (M) to Bob where the ...
3
votes
1answer
281 views

Compromised JSON Web Token (JWT) Bearer Token

We are implementing a REST service that requires authentication and authorization. Because of the stateless nature of REST API's, we want to use JWT to make authenticated calls to the API through a ...
0
votes
1answer
68 views

Decoding tunnel bytes in EAP-TLS or EAP-TTLS using Wireshark

I have a few pcaps of traffic for EAP-TTLS conversation, carried by RADIUS. I also have some being carried by EAPoL, but I think the answer to that case might be even less straightforward (though ...
1
vote
1answer
26 views

Using OAuth 2.0 without token storage

I am building a system for a product which requires Authentication and Authorization. Naturally I have chosen using OAuth 2.0 as it is a commonly used protocol and has proven to be useful. I am ...
0
votes
3answers
53 views

How SplashData knows about Worst Passwords used by users annually

It is known that every reputable website stores their user passwords into their database after implementing some hashing algorithm on it, and even they don't know what the actual password of the user ...
3
votes
4answers
84 views

Hardware token to authenticate web application

My company is developing a web application, and I was asked to research how to do hardware-based token authentication to login into our web application. Let me repeat: basically there will be a web ...
1
vote
1answer
58 views

Can Facebook login to my app?

This sounds maybe like a stupid question, but I'm wondering myself if this is theoretically possible. Let's say I'm using Facebook login in my app. If the login is successful I get I get back an ...
2
votes
3answers
147 views

Web site accepting authentication via GET

There is a sign-in form on the website, which submits login/password via POST method. Problem is, that code, which accepts login/password and authenticate user also accepts it via GET method (also, if ...
2
votes
1answer
182 views

Windows Authentication to protect API

One of my colleagues has a web api call that is checking that the user is logged in and his token matches what is in session (thanks to all of you for your help). Let's say this is layer blue. After ...
4
votes
3answers
223 views

How does EAP/PEAP integrate with modern security protocols?

How exactly does Extensible Authentication Protocol (EAP)/Protected EAP integrate into modern security protocols? What I know (or not know) so far... It's used by wireless networks utilizing ...
0
votes
1answer
147 views

What is a AUTH-KEY in the security of the computers?

I don't know if this is the right section to post my question and if it is not I apologize. I'm studying security in computers and in particular the URL Spoofing. I understand that a form of URL ...
1
vote
2answers
56 views

is IPSEC Authentication between local domain hosts a part of normal behaviour in a Windows network?

I am seeing lot of IPSEC Authentication messages in eventlogs of Windows domain hosts. I was wondering if this - setting up IPSEC connections between domain workstations is a part of normal Windows ...
0
votes
1answer
90 views

How does the Dell Sonic wall Authentication works?

My College Router has Dell Sonicwall authentication. We will be automatically redirected to the login page. If the username and password is correct a new popup opens showing that user 'x' has logged ...
2
votes
1answer
486 views

Facebook oAuth2 for Javascript client application

When implementing Facebook login using oAuth2 (the Javascript version), I receive an access token back from the Facebook auth server. So far so good. The problem I have is that I want to implement a ...
-1
votes
1answer
26 views

How do server know the CSR sender is approved client?

Suppose have a server provide a POST url to send CSR. The response certificate then will be used for later SSL client-cert auth connection. The prblem is anyone can POST a CSR to the server and then ...
-2
votes
1answer
51 views

HTTP status code for successful login

I have a web application for testing. It has a login page. For unsuccessful login attempts, the developers have made a custom error page so that the response from the web application shows 200 OK, ...
0
votes
1answer
37 views

How do you log into Amazon Web Services if you lose your phone which has Google 2-factor authentication set up?

And if it is possible, how do you prevent other people from claiming they are you and lost their phone? Amazon only directs you to a page which does not exist. http://aws.amazon.com/iam/faqs/ If ...
6
votes
2answers
645 views

Security concept for Android app with PHP based REST API

I'm trying to build my own PHP based REST Api for my Android app and I'm a litte bit confused by all the different user authentication stuff one can find on the internet. So I want to present my ...
3
votes
2answers
53 views

What is the name for “imperfect” verification options?

Let's say users log into a system using a voice-print. Software can read the input from the microphone, compare it to the stored sample, and tell the user "There is a 97.5% similarity to the ...
0
votes
1answer
49 views

Securing access tokens?

Preface: I have no experience with securing applications whatsoever. I'm building a web app that uses Google Plus authentication to sign users in. My initial thought is to save the access token that ...
-3
votes
0answers
21 views

What are the differences between ntlm, basic and digest authentication mechanisms in terms of security? [closed]

Can someone give me the major difference between ntlm, basic and digest authentication methods, to be precise, in terms of security?
3
votes
1answer
170 views

How do OTP USB sticks work?

I just discovered the YubiKey NEO which seems like a pretty awesome device for maintaining security for a variety of different things including computer login, SSH private keys, GPG private keys, and ...
0
votes
1answer
29 views

User-friendly public/private manual authentication protocol

I have a remote service which allows users to SSH login to the machine and they're automatically sent to the (command line) application (without access to a bash prompt, for instance). In the course ...
1
vote
1answer
250 views

automatic connection from LSASS to different IPs. Is this the usual behavior?

I'm using windows 7. firefox 22. connecting through a regular residential wifi router. In the last month I've noticed that when I connect to the internet and once in a while my firewall indicates me ...
0
votes
1answer
45 views

Sharing RSA Public Key for decrypting JWT amongst Load Balanced servers

I'm trying to implement a cookie-less authentication mechanism for a web API that is stateless on the server (does not store session tokens) and can be load balanced across several servers. I have ...
0
votes
1answer
50 views

single sign on across two servers

I have been wondering how and what kind of tools are needed to do single sign on in the following scenario: 1) Alice is logged in to site X hosted by server W 2) Alice navigates site Y hosted by ...
-1
votes
0answers
39 views

Broken Authentication and Session Management Challenge [closed]

I'm trying to complete the OWASP Security Shepherd challenges and I'm a bit stuck on the Broken Authentication and Session Management Challenge. The challenge reads: Only administrators of the ...
0
votes
0answers
13 views

How to authenticate user on backend service using OpenId Connect [migrated]

I'm trying to find a way to authenticate user of front web application, who is authenticated by OpenId Connect Code Flow, on backend REST services, which currently support OpenId Connect Code and ...
3
votes
2answers
2k 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 ...
4
votes
0answers
76 views

What to do about “approved” direct banking MITM sites like sofort.com?

Brussels Airlines allows several payment types, only two of which are free: Maestro and Sofort Banking: The second option was new to me, but direct debit is usually a free and practical way to pay: ...
0
votes
2answers
33 views

Ubuntu backup to only specific devices

I am looking into setting up a secure Ubuntu server with daily backups to two different external hard drives that will be swapped with the external hard drive that is stored in a safe deposit box. ...
5
votes
2answers
583 views

Authentication: Username (email) and password hashed together in one database field

I am currently developping a platform with a PHP framework for our client. The head of the client's IT department wants us to handle authentication with one database field containing ...
-2
votes
1answer
83 views

What is “Pass the hash” attack?

The article on Wikipedia doesn't explain how the attacker can authenticate to the remote server using the hash instead of the original password. According to the following article the attack is still ...
0
votes
1answer
83 views

Is the following PayPal Vulnerability a design/implementation flaw?

I am trying to understand the logic behind following vulnerability, I believe this a design flaw not only an implementation. To me the problem with the two-factor authentication service at PayPal is ...
2
votes
1answer
262 views

Facebook iOS SDK Authentication

The Facebook iOS SDK only needs your bundle & app IDs of your iOS app to match those of your Facebook app. If I find out an app's app ID, can't I just create another iOS app with that app's ...
0
votes
2answers
51 views

Detect Different Machine using Browser [closed]

Some web apps like Facebook and Gmail detect the first time we try to login from a device. Assuming that a browser can't read machine name, and MAC ADDRESS. What kind of variables are they collecting ...
19
votes
5answers
5k views

Why is “something you know” the weakest factor of authentication?

Quoting from CompTIA Security+ guide The first factor of authentication (something you know, such as password or PIN) is the weakest factor. Why? it makes sense when we say that humans/users ...
0
votes
2answers
69 views

OTP vs. Keyfile

I have been wondering what are the benefits and cons of using an OTP (one time password) versus a keyfile to, for example, decrypt a keepass database, connect to a server via SSH, or other uses. ...
0
votes
2answers
98 views

future of graphical password authentication [closed]

I'm a student currently pursuing my Engineering in Computers. I'm planning to put all my knowledge in and try to actually implement something related to security. To be more specific I'm more ...
282
votes
20answers
47k views

How does changing your password every 90 days increase security?

Where I work I'm forced to change my password every 90 days. This security measure has been in place in many organizations for as long as I can remember. Is there a specific security vulnerability ...
1
vote
4answers
394 views

Authenticate user without knowing their password

I'm working on a project where each each user will have a public/private RSA key-pair. Users will be able to send encrypted messages to each other using the each target user's public key so that only ...
0
votes
3answers
43 views

How is chase mobile deposit verified? [duplicate]

I read this but it didn't ask the question I want answered. How is Chase Mobile Deposit Secure? What I want to know is how do they avoid accepting a Photoshopped check? When someone gives me a ...
7
votes
4answers
639 views

What are factors in evaluating the fitness of a security questions?

Attempting to understand the key factors in evaluating the fitness of security questions. By security questions, I mean for example: What was the name of your first pet? In what city was [insert ...