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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1answer
249 views

SAML and OpenID, centralized and decentralized

I'm learning SAML, which is said to be centralized. To understand the difference with decentralized, I'm reading about OpenID. I find it difficult to understand the difference between the two, ...
9
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1answer
600 views

How to stop password recovery attempts on accounts?

I am using social networking services such as My Banking GMail PayPal Facebook Twitter Google+ LinkedIn All of these services text messages me a six digit code to login from anywhere, even a ...
5
votes
5answers
1k views

What is the most credible timestamp I can create for a digital file?

Is it possible to create a timestamp that is so hard to fake, that it could be used as proof or simply strong evidence in a court of law, that something was not created after a certain point in time? ...
2
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4answers
660 views

how secure is rsa encryption for a web login without https?

I have a server running rstudio. This is basically a web application, and it is currently only accessible over the local network. The web app takes your Linux username/password in order to log you ...
0
votes
2answers
138 views

Is it safe to use a ECDSA public key as a password seed for GCM/AES?

Two peers already exchanged their ECDSA (curve secp256k1) public keys using a secure channel. They want to establish an authenticated encrypted channel between them. They will use CCM mode and with ...
1
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2answers
131 views

Forced to use using 2-Step Authentication to keep online profiles safe?

I am starting to see a majority of services, websites, and social networks offering the 2-step Authentication like crazy now to protect their users. Also, after reading how the Twitter Account N was ...
10
votes
2answers
2k views

LastPass Grid Authentication vs Google Authenticator which one is more secure?

[Being a LastPass user] recently I moved to Google Authenticator instead of using Grid Authentication as a 2-factor security. For me, finding and filling letters from such a dense matrix is a rather ...
2
votes
1answer
721 views

How do application specific passwords work in Google accounts? [duplicate]

I turned on 2-step verification and had to setup an application specific password for Outlook. I noticed the password generated is actually weaker than the one I had before turning on 2-step ...
1
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1answer
168 views

Securing Javascript plugin

My company offers a Javascript plugin that is meant to be embedded with websites. It works in a similar fashion to Google Analytics, in which you add a bit of Javascript and then it does some magic on ...
0
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2answers
128 views

Can session data be manipulated without access to source code

When implementing a web-based application, how secure are any session variables against manual manipulation beyond the scope of my code? i.e. when a user is authenticated, if I were to initialise a ...
1
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1answer
515 views

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

I'm studying security in computers and in particular the URL Spoofing. I understand that a form of URL spoofing is phishing. Then I read that a countermeasure against phishing is the authentication ...
1
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1answer
317 views

SSL Handshake random number?

I realized all of the phase of the handshake but I do not understand how it does that from the two randomly generated numbers are unable to generate a session key that the client and the server uses ...
1
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1answer
96 views

Amazon Turk - How secure is it? Strange behavior

I just had this really strange experience with Amazon Turk, where suddenly I was logged into someone else's account. I was logged into the company's Turk account, left my computer for a while, ...
1
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0answers
191 views

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
votes
2answers
267 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 ...
5
votes
3answers
2k views

Is it good idea to rely on Mifare UID for security/authorization reasons?

Several systems rely on using UID of smart card for identification/authorization. For example database stores list of smart card UIDs and corresponding privileges. Given that today there exist cards ...
0
votes
1answer
3k 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 ...
1
vote
3answers
241 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 ...
3
votes
2answers
438 views

Random token and email confirmation key of 10 chars sufficient?

I have a function that returns random unguessable keys with the following characters: a-z A-Z 0-9. I have set the key length to 10 and I am using that for my form tokens to prevent CRSF and I will be ...
1
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2answers
341 views

How to avoid DDOS against Kerberos Authentication Server

I have a school project where i am supposed to implement a Kerberos based infrastructure (AS, TGS and resource server). It is already done and working, but i started thinking about how to protect the ...
1
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1answer
164 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 ...
1
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1answer
65 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 ...
1
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2answers
317 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 ...
1
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0answers
171 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 ...
1
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0answers
204 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 ...
-5
votes
3answers
14k 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 ...
1
vote
1answer
235 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 ...
1
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1answer
93 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 ...
16
votes
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 ...
2
votes
2answers
167 views

How to build a secure affiliate network

I'm going to build a demo affiliate network, which needs to be secured. Let say I have a web application called Affiliate Network Manager that manages all affiliates associated with my online book ...
6
votes
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 ...
4
votes
3answers
227 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 ...
1
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1answer
68 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 ...
2
votes
2answers
145 views

Save application autostart login token on computer

I need to login desktop application while autostart on server (like skype does). What is the best practice to save authentication token (password)? Should I use something like RSA encryption (which ...
1
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0answers
82 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
vote
3answers
68 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 ...
1
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1answer
182 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. ...
4
votes
1answer
194 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 ...
0
votes
1answer
145 views

Api authorization basic concepts in detail

I am trying to write an application is rails. Which is more like a api application so that when a user gets redirected from his application into mine I would like to authorize him and start a session ...
4
votes
1answer
1k views

Using client certificates for website authentication

I was wondering if there currently exists a Content Management System that supports PKI and client certificates for website authentication instead of username/passwords. If not, what's a good place to ...
1
vote
0answers
189 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
votes
7answers
364 views

Why not ask for a password and 2-factor token at the same time?

I have observed a number of web-based login forms that offer 2-factor authentication do token entry on a second form after validating your username and password. Is there a reason not to ask people ...
4
votes
2answers
379 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 ...
12
votes
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 ...
1
vote
0answers
229 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 ...
9
votes
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 ...
0
votes
1answer
139 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 ...
-5
votes
1answer
144 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 ...
1
vote
2answers
181 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 ...
2
votes
2answers
127 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 ...