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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Can the device seed be recovered from the iPhone/Android RSA SecurID app?

The Windows RSA SecurID app allows the device seed to be determined and cloned from one machine to another (see this blog post). Do either the iPhone or Android RSA SecurID apps suffer from the same ...
3
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2answers
101 views

What's a good time period before refreshing CSRF token of the user session?

I am using a form token to prevent CSRF attacks. Those tokens are stored and tied to a user's session. Now I want to refresh the token only every N minutes or hours so that the user's don't experience ...
0
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1answer
219 views

Use SSH config file with Putty [closed]

I'm using SourceTree (a Git GUI) which uses PuTTY as SSH client. I need to push some code into a repository for which I need to tunnel through SSH to do so. The trouble is, the repository and SSH ...
3
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1answer
684 views

Why is OAuth 2.0 being used for mobile devices, and not OpenID?

Microsoft Azure Mobile services exclusively uses OAuth 2.0 for authentication, and many other providers mention the use of OAuth 2.0 specifically when referring to mobile devices. Question What ...
8
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2answers
420 views

How is an HTTPS login secure when pages use HTTP?

When someone go to eBay's website, they use an unencrypted connection between their PC and eBay's server. If they sign in, they are redirected to a secure site identified by its certificate and may ...
3
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2answers
893 views

How can I implement authentication in my proxy server?

I have a proxy server, it will have a captive portal page. Users will be required to sign in before gaining access to the internet. So far I am aware of IP and/or MAC address based authentication. ...
6
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5answers
1k views

Preventing online voter fraud

As part of a promotional campaign, my company wants to launch a site where users (and potential users) of our product will be required to register and vote for certain choices. Depending on how ...
3
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3answers
404 views

Should email verification links be 'time limited' after user registration?

Regarding web application user management, I understand that password reset links are effectively "password equivalents", and therefore it makes sense to limit them to one use only and also make them ...
3
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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 ...
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3answers
119 views

How can I add a layer of security to cleartext passwords and SSL?

I'm creating a web API in .Net for a web application. I'm wondering what the industry standard for login authentication is. I know that most people believe that sending cleartext username/passwords ...
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1answer
583 views

What happens if you run out of password attempts?

In Samsung Knox, you have 20 password attempts. However, it is never explained what happens if you run out of attempts. Does it delete your Knox data, do you need to enter the recovery PIN or is it ...
8
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3answers
485 views

Why would a website allow answers to security questions to be used interchangeably?

I needed to reset my password on a website that uses security questions for the purpose, and I noticed something strange. My hypothetical security questions are (not the ones I actually use) are: ...
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1answer
85 views

Web Application Authentication Using Computer Properties

Introduction: I am in the process of building a web-based game that requires user authentication. The vast majority of other gaming sites utilize the typical username/password method for ...
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1answer
43 views

Evaluation of cryptosystem for authentication and keyexchange

I'm a masters student in computer science who works part time with my own company as a consultant. My lastest project is based on my bachelor thesis which handles everything except the security. The ...
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2answers
124 views

How to make an efficient bruteforce attack on Windows? [closed]

I've been trying to figure out a way to efficiently bruteforce on Windows, but the method I currently have isn't very efficient. I did some profiling and found out that on average it can go through ...
-4
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3answers
2k views

How do I hack this login page by using SQL injection? [closed]

I'm testing a client's web site vulnerability to SQL injection, which appears to be the case. The web site is hosted in IIS on a Windows server and is using Microsoft's .NET framework with SQL. I'm ...
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0answers
74 views

Login Authentication with SSL and HMAC

My question is pretty similar to : http://stackoverflow.com/questions/5487757/using-hmac-sha1-for-api-authentication-how-to-store-the-client-password-secure. Basically, I want to write an API for my ...
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0answers
76 views

Client-server authentication protocol suggestion

I'm designing an authentication methods for my client/server system consisting of: a windows desktop client application (.NET) windows/linux servers (C++) one "security server" which authorizes the ...
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1answer
119 views

Confused about the most relevant way to secure my APIs

I own a Javascript application (Single Page Application) hitting some apis from my own RESTful backend. What I expect for my authentication/(authorization) mechanism is three things: Preventing ...
16
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5answers
2k views

How many Stack Exchange logins should I have?

On Stack Exchange's Add a login page, one can add logins with Google, Facebook, Yahoo, etc. How many logins should I have to provide the least chance of a hacker gaining access to my Stack Exchange ...
1
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1answer
57 views

Any known protocol for establishing trust between an inherently untrustworthy source and a server without a 3rd party?

Is there any kind of protocol, scheme, or theoretical paper out there that implements or examines the problem of establishing trust between two parties (communicating, listening) where the ...
6
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3answers
1k views

What's wrong with my own authentication scheme?

So I want to write my own authentication scheme for a web-app server, as follows. I assume this is a Bad Idea from either security or cost-effectiveness reasons and I know the conventional wisdom is ...
3
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2answers
777 views

Token authentication and storage / websocket issues

My application is running an API authentication that uses tokens rather than cookies. This leads me to ask a few questions : What is the most secure way to store the token ? By using random ...
4
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3answers
172 views

Why do some websites need time to log you in securely, while others can do it instantly?

I noted that on a lot of money-related websites (banks, paypal, etc), you are brought to a page that "logs you in securely". This is an example of one: Meanwhile, websites that also store very ...
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1answer
37 views

Issues of using HOTP w/ iteration window

I am using HOTP to generate OTP to validate a request, in order to prevent replay attacks. I'm thinking about using a window of 10 (or so) iterations to accommodate a possible mismatch in the counter ...
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3answers
45 views

Secure Custom Registration Links

I'm working on a website that allows a current user to invite another individual to be friends by typing in the non-user's email address. The non-user would then receive a custom registration url by ...
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0answers
42 views

Considerations when implementing a key based SSH-like auth scheme

I have a SMTP server where all the users (for an unrelated reason) will have public keys tied to their username and registered with the server. I want to add a non-standard extension that uses these ...
1
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1answer
54 views

Client authentication flaw in old Netscape SSL protocol

Below is a screenshot from the paper "Prudent Engineering Practice for Cryptographic Protocols" by Martin Abadi and Roger Needham. I can't see what's wrong with the protocol and what the fix achieves. ...
20
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4answers
6k views

How secure is Windows 8's Picture Password login?

The final Windows 8 build has been released to manufacturing. One of the new features of Windows 8 is "Picture Password", where the end user logs on to Windows by clicking a specific pattern on the ...
4
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2answers
455 views

Is OATH TOTP and / or Google Authenticator vulnerable if an attacker has (N) previous codes?

I'm not much of a ipsec initiate, so this is a bit over my head ... but I'm always willing to learn more. Are there any known attacks against OATH TOTP (Google Authenticator's / Authy's algorithm) if ...
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0answers
91 views

Can we create custom APDU for non-smart (memory type) contactless card?

I want to implement card-based authentication for the parking system in a university. Currently all students own a Java Card-based student ID card, if they have not broken or lost it. Can we create ...
3
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1answer
94 views

Is there an actual use for OpenPGP authentication keys?

The OpenPGP specification (RFC 4880) describes, page 34, the different capabilities that an OpenPGP key may have; including: 0x20 - This key may be used for authentication. In GnuPG, one of the ...
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2answers
160 views

LastPass login security

If LastPass does not store your master password, then how can you login to use their web app? Surely you must type it in, it is sent over using SSL, and then salted/hashed on the server-side, and ...
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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
81 views

Digital signature based authentication schema using two passwords

I'm working on an authentication system for a web based Bitcoin-related service. As part of the service, users do some less sensitive operations (mostly reading and sending various types of ...
0
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1answer
66 views

is there any 100% secure way for form authentication and sending information from client side to server side over internet pages? [closed]

i think for acquiring 100 % secure data transfer between forms on client side and c# code on server side ? my tools : i use IIS as my server and i wonder how can i reach for latest security that ...
9
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6answers
1k views

What methods can be used to prevent mistyped usernames?

I wanted to log on to my account on my bank's website. The account is protected by a number of security checks. The first one is what really amounts to a username, a confidential one. It's an 8-digit ...
2
votes
4answers
2k views

SQL Injection with pass MD5

I want to know, if in my login form there is any SQL injection possible. If there is, what could the exploit's web form entry look like? I send username and password by html form (POST). The login ...
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1answer
83 views

Using same CSRF Token for Multiple account creation [closed]

While Pentesting through some sites i found that an Multiple account's can be created using same CSRF token which should not allowed.I want to place two scenario's to describe my question. Scenario ...
8
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3answers
11k views

Is there any SQL injection for this PHP login example?

I want to write a login form, and I got one example from the web. I want to know, if there is any SQL injection for this code? If there is, what could the exploit's web form entry look like? This is ...
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2answers
111 views

How can I analyze password recovery tokens?

All websites that support authenticated user interactions have a password recovery feature. Usually they will email the password reset link through which you can easily recover your account by typing ...
1
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1answer
231 views

Hashing the cookie token for persistent login

In a login system I'm doing, I'm using a per-user, per-device randomly generated cookie token. A part of the script looks like this: // Generate current device's token $token = ...
1
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0answers
178 views

I authenticate my users through Facebook's Oauth client and want to secure my own called APIs

My application is divised into two parts: Javascript application as client Server side API's (RESTFUL through Play!2.2 framework) I expect users to be authenticated through Facebook's Oauth 2.0 ...
21
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3answers
2k 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. ...
0
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1answer
90 views

Can I use 2 factor authentication for shared accounts?

Is it possible to use SecurID 2FA for Highly Privileged shared accounts? I am currently using CyberArk to vault passwords for privileged accounts. when I checkout a password, I would like to make sure ...
2
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1answer
188 views

How to use TPM to perform platform authentication?

I am currently looking at TPM (Trusted Platform Module) and wondering how does TPM offer platform authentication. Suppose a legal host is deployed on the cloud. How do I use TPM to assure that the ...
1
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0answers
159 views

What is the preferred way of using AWS (specifically S3) from mobile apps?

Adding the AWS access key and secret key directly in app code is definitely not a good approach, primarily because the app resides on the users device (unlike server side code), and can be reverse ...
2
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4answers
341 views

Is there a way to keep sudoers from editing stuff in /etc/ssh/sshd_config?

I have root login disabled in SSH and I want to be able to eliminate the possibility of a sudo user editing the /etc/ssh/sshd_config file and enabling root ssh login. Is this possible?
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2answers
88 views

Hardware-restricted root login

I was thinking about how security on my Linux server can be increased and came up with this question: If most intrusions are performed by gaining remote access to machines, would it be possible and ...
3
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1answer
378 views

Securing mobile app rest requests

I am using Facebook login in a mobile native app, and I'm trying to figure out if my approach is secure enough. This is the flow (all communication is made over SSL): User logins to Facebook ...