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

learn more… | top users | synonyms (1)

0
votes
2answers
116 views

Is it safe to rely on text messages as a means on authentication?

Many websites, including banks, use text messages as their primary or secondary means of authentication. In theory, it sounds like a perfect method unless the user loses their phone or has it infected ...
0
votes
0answers
38 views

Algorithm to Transaction Data Signing

Transaction Data Signing I need an idea to develop a very secure algorithm to authenticate online operations using PHP in the server and an Android app in the user's device. What is the idea? The ...
1
vote
1answer
63 views

Are there other ways for a CA to have their certificates included in a browser?

From what I understand, the certificate authorities (CAs) have to get their root certificate included in the browser. What if the root certificate of a particular CA is not included in the web ...
7
votes
3answers
216 views

Limiting the root certificate chain

I'm playing around with the idea of running a mini-CA with my (hobby) website, likely only used internally with a few select developers for internal emails, client authentication, staging/development ...
-1
votes
1answer
76 views

Prevent someone to login to my website from teamviewer

I have my own suspicions that there are blocked users of my website that use Teamviewer to login to my site from their friends' pc. Is there any way to identify if the one who visit a website is using ...
2
votes
1answer
82 views

Does using token-based auth make CSRF checks on login unnecessary?

Based on my understanding, avoiding the use of cookies as an authentication mechanism prevents CSRF vulnerabilities entirely (namely token based authentication in an SPA), when authenticated. Does ...
0
votes
1answer
67 views

Secure end-to-end when part of conversation must be over HTTP

We have a situation where a user's identity can be verified as follows: the network provider knows the identity of the user and injects secure headers into the HTTP request, which our servers can use ...
0
votes
0answers
30 views

Best practices concerning pushing user registrations

Imagine an organization which possesses a lot of personal customer data in their internal databases. This organization creates a web application, and wishes to be able to send a registration link to ...
0
votes
2answers
81 views

RSA for authentication?

Is it possible to use RSA public and private keys to authenticate two computers (or to make sure they're both the right computers)? If so, how? Thanks!
3
votes
4answers
200 views

Ethical brute force demo on a web login when knowing the password complexity requirements

We are currently having accounts compromised at a substantially high rate. Some in the organization believe that our password complexity requirements is enough to thwart brute force attacks. I wanted ...
38
votes
2answers
4k views

Is it good practice to ban an IP address if too many login attempts are made from it?

Since an IP address does not necessarily represent a specific device, but probably a whole network/company/etc. does it at all make sense to block an IP address if there is a significant amount of ...
3
votes
6answers
226 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 ...
7
votes
6answers
788 views

POP3/IMAP Stronger Authentication

We recently deployed a two-factor-authentication solution in order to strength logon to our web applications (one of them is web based mail, Microsoft outlook web access) Most of the users who have ...
0
votes
2answers
82 views

Creating port-specific SSH authentication for the same user

I have a Linux server running SSHD and would like to know if its possible to configure it, such that from within the LAN you only need a RSA key to authenticate (on port X), but from outside the LAN ...
4
votes
3answers
616 views

Two-Factor Authentication: When is it worth it?

I was reading this article, and it triggered the question: Why not use two factor authentication? In his case, it both possibilities were enabled anyway, so this looks to me like it's two attack ...
1
vote
1answer
62 views

How do I migrate users with shared email addresses to an email-based forgotten password process?

I'm migrating users from custom application-level authentication security (built into the app, using username as the unique identifier) to security as a service (using ThinkTecture's Identity Server ...
1
vote
4answers
298 views

How to figure out who is pummeling my WP install with bogus login attempts

I have a WordPress install which uses the plugin Wordfence. I set Wordfence to block the IP of anyone trying to log in with a non-existent username. For several months now, I have been getting many ...
4
votes
3answers
2k views

Safe to expose Active Directory via LDAPS externally?

We currently access Active Directory via LDAPS internally for authentication and user data retrieval. Is it common, or safe, to expose this publicly over LDAPs? Addendum 1: Our business case, ...
4
votes
2answers
163 views

Can the client certificate authentication process treated as a user digitally signed the content(and then get verified on the server)?

The authentication was triggered by certain event (like approving button) on the form. In the process of client certificate authentication (in IIS), user was asked to use their PIN (private key) and ...
1
vote
2answers
77 views

Authenticated sessions and Man in the middle

I see a lot of websites (including Stackoverflow) using this authentication mechanism: Client authenticates under HTTPS and gets back a session id. Client drops back to HTTP and accesses secure ...
10
votes
7answers
5k views

Forgotten password or reset link, which is more secure to email?

I originally posted this as a reply here in this thread but didn't get much feedback on it, and now I'm curious as to what others think is the best approach, or if there is any difference between the ...
35
votes
11answers
5k views

Sending passwords to someone remotely

As someone who usually works with people in other countries it has always been a problem to send login information to each-other. For development login details like debug databases etc sure I can ...
0
votes
3answers
155 views

failed Login attempts logic

I want to add security to the system login. So here's my idea: If a user tries to login with a valid username but invalid password, then count it as a failed login attempt and store it in the users ...
3
votes
3answers
215 views

PHP IP check as security?

Would just like some input on a PHP script I'm writing. It's just a simple script that only myself should be able to access. I don't have a dynamic IP address, so this isn't an issue for me, but I'm ...
1
vote
1answer
57 views

what are security flaws on providing access to users through a unlisted/private/token/signed URL?

Some web applications enable registered users to grant temporal application access to un-registered users sending token/private/unlisted/signed URLs (I ignore the exact terminology for this), which ...
17
votes
2answers
8k views

JSON Web Tokens (JWT) as user identification and authentication tokens

I'm implementing a REST service that requires authentication. I cannot store any per-user state (such as a randomly-generated token) because my service does not have direct access to a database, only ...
2
votes
0answers
109 views

Why is AWS phasing out public/private key authentication? [closed]

I'm working on the authentication strategy for my app (again). My current strategy is a clone of the AWS strategy of issuing public and private keys and using them to sign requests sent to my API. My ...
3
votes
2answers
316 views

Computer-level logging by financial institutions

I am looking for the best approach to recognizing a specific computer and saving that computer as a "safe" login machine. My intuition points me to using cookies, but what value do I store in there to ...
14
votes
4answers
3k views

Three-Factor Authentication for Windows

This HowToGeek article... http://www.howtogeek.com/67556/how-to-unlock-your-pc-by-being-nearby-with-a-bluetooth-phone/ ...got me thinking. Is there any software (or combination of software) that ...
8
votes
2answers
4k views

Difference Between OAUTH, OpenID and OPENID Connect in very simple term?

I am very confused the difficult jargon available in web about OAUTH, OpenID and OPENID Connect. Can anyone tell me the difference in simple words.
0
votes
1answer
59 views

Using encrypted data in session key instead of random

I am writing a service-oriented (REST) application that is (nearly) totally stateless: it can authenticate by API keys, but for web UI it uses the session where it stores nothing but an authenticated ...
3
votes
1answer
594 views

Authenticating users on offline devices such as ipad

We are wanting to authenticate the user inside a webapp (JavaScript/HTML inside browser) running on a tablet, but want to be able to do this when the device is offline from the network. I realize this ...
2
votes
2answers
183 views

Dual Authorization (Social Auth 2.0)

Can you see any obvious challenges to requiring 2+ users to confirm authentication requests using an association such as a friendship type of relationship. A practical application would be an ...
1
vote
1answer
98 views

Challenge-response login without storing a password equivalent

A problem with many challenge-response login systems is that the server has to store a password equivalent. For example, if the server stores SHA1(salt + password), and an attacker captures that hash, ...
52
votes
8answers
80k 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 ...
-1
votes
3answers
53 views

How would authentication when depositing, and withdrawing money from a fund, differ?

I have to do a presentation on developing an authentication plan for a financial services application used to manage an investment portfolio. I have to develop use scenarios for the 2 functions ...
4
votes
1answer
151 views

Is it a security risk for users not to logout of a website?

Is it a security risk to myself that I am not logging out of Twitter, Facebook, StackExchange, and a majority of the sites which I am using? Is there a chance for someone to hijack my session or cause ...
1
vote
4answers
242 views

Log in with email is more secure than a username?

Within the design of my web application, I am trying to now choose the final steps of the members profiles for security. *I need to choose if I should use a system which you login with a username or ...
7
votes
1answer
408 views

Is there a list of phone numbers Facebook uses to send auth tokens?

Up to a few days ago, I always received Facebook auth tokens from numbers +181338477XX, except a few times from +85294985XXX. Problem is that lately I've been receiving codes directly from Italian ...
70
votes
7answers
26k 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?
5
votes
3answers
3k views

Are fingerprint scanners easy to bypass?

Thinking about adding a fingerprint based authentication layer, but then I recalled the MythBusters beat fingerprint security system episode -- is this a common issue, and if not, how do you tell if a ...
0
votes
2answers
143 views

Determining the accuracy of a biometric system

How is the accuracy of a biometric security system (its ability to minimize false acceptance rate and false rejection rate) determined?
60
votes
3answers
15k views

How does Google Authenticator work?

Google Authenticator is an alternative to SMS for 2Step verification, installing an app on Android where the codes will be sent. It works without any connectivity; it even works on plane mode. This ...
0
votes
3answers
48 views

Restrict access to admin area by checking SSH connections

Assuming that the users have dynamic IPs (so I can't whitelist) and that setting up a VPN is not an option, is it a valid approach to restrict access to an administration area by only allowing IPs ...
1
vote
3answers
59 views

Is it ok to use the same password for many services with two-factor authentication?

Let's say that I've a relatively strong password, but I don't want to use many different passwords for each different service, and let's say that those services provide two-factor authentication using ...
13
votes
2answers
639 views

Is it okay to sign a PGP key without an IRL meeting?

[PGP] can get paralyzed by excessive analness. — Phil Zimmermann Preamble I am in the process of building my own web of trust. That is, I want people (PGP users…) to be—fairly—sure that, by ...
6
votes
3answers
2k views

Terminology: authentication vs verification

The two words have a similar meaning and I'm having difficulty adequately explaining the difference to someone. You verify a person's identity by having them show a form of identification, such as a ...
4
votes
2answers
118 views

What's the meaning of the term “ad-hoc MAC” (Message Authentication Code)?

In SSL literature, I've noticed the use of the term "ad-hoc MAC". I understand the meaning of MAC (Message Authentication Code) and how it works, but what does the term Ad-hoc MAC mean? Note: With ...
55
votes
7answers
34k views

Certificate based authentication vs Username and Password authentication

What are the advantages and drawbacks of the certificate based authentication over username and password authentication? I know some, but I would appreciate a structured and detailed answer. UPDATE ...
2
votes
1answer
126 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, ...