Questions tagged [authentication]

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

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29 views

IAM to IAM federation vs IAM to application federation

Considering two different scenarios: Federating our IAM with individual applications, for example a single SaaS or in house development Federating our IAM with another IAM instance, for example when ...
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How does MariaDB's ed25519 auth scheme work?

Newer versions of MariaDB (a MySQL database server fork) have a new password based auth scheme called "ed25519". The docs are very sparse regarding how it works and what it does. https://mariadb.com/...
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Does Nextcloud installation gives passwordless access to all files by default?

I used this guide to install Nextcloud instance on a Raspberry Pi. The installation went smoothly and in the end I could open the Nextcloud login page which, once presented with the right password, ...
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Authentication handshake between two independent apps

I need help on a solution for below scenario from a security perspective. Scenario: There are two independent web applications App1 and App2. User will log in to App1 by performing authentication ...
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94 views

Website online assistant asked for my password

Sorry if this isn't the right place for this.. I recently joined an online gambling website and clicked on live assist. To verify my identity they asked for my username and password. I did not give ...
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108 views

What should be done if 2FA was turned off in an unexpected manner?

Today when I logged in Facebook, no 2FA was shown. I have been using SMS message as the second authentication factor. When I looked at the security settings, 2FA seemed to be disabled. I immediately ...
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205 views

Two Factor Authentication Multiple Devices

Most websites (that I have seen) that implement two factor authentication don't support multiple two factor authentication devices linked to one account. The biggest reasons I can think of for that ...
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29 views

Security implications of client side authentication with a remote database

I'm developing a desktop app for use internal to my company. The app's installation file is located on our company server and therefore is only accessible to authenticated employees (under the ...
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1k views

Smartcard authentication SSH remote client

I want to use smartcard authentication for my SSH sessions. Now sometimes I want to use a ssh client within a ssh session. So this situation: My desktop computer with smartcard has a ssh session to ...
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143 views

Attack vectors with encrypted SAML assertion response

I'm testing a web application which uses SAML SSO. SAML Response has signature and it is verified correctly if data is tampered. But I noticed that when signature is removed completely authentication ...
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1answer
231 views

Is using WebAuthn alone considered as two factor authentication?

Will using WebAuthn for an application make it two factor? I am specifically interested in using Ondevice biometrics and achieve passwordless authentication. For a true two factor authentication you ...
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Is there any advantage in using Google's IAM on Android?

We are building a few corporate apps for field workers / front office. In most cases each user will have their own device, but there are some shared devices (for example reception). The devices are ...
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How to integrate an Oauth2 based application into a Wordpress plugin?

I'm working on a Wordpress plugin that integrates an external service. This service has an API that authenticates using OAuth 2.0. The plugin is public and can be used by anyone who has an account at ...
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863 views

How to protect WordPress from brute-force attacks?

One of my WordPress sites is being constantly attacked with brute force. I have the WordFence and Clef plugins installed. The number of login attempts is limited to just one. The password is very ...
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83 views

Deeplinks in email that autologin

I'm wondering if a deep link in an e-mail that automatically authenticate even though the session is expired is GDPR compliant. For instance if I send an e-mail to a user with links to the internal ...
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1answer
707 views

SEToolkit Not Cloning Login Page

I am trying to clone a login page with SEToolkit in the latest version of Kali Linux. SEToolkit simply isn't working. I have tried running it with normal user privileges and sudo. I have placed in ...
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2-step authorization (using SMS) less secure than being without 2FA at all?

I've been thinking about a paradoxical but a theoretically possible event: Even though SMS-based 2-step authorization increases security generally, on the other hand, in some cases, it might become ...
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Can I use a JWT for both Authentication & Data Transmission

I think I have a high level understanding of what a JWT is and how it works. I would now like to apply it to a use case, namely that the token would be used for authentication purposes, and passing ...
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Does correcting misspelled usernames create a security risk?

Does correcting a misspelled username and prompting the user with a valid username introduce a security risk? I recently tried logging into facebook and misspelled my email. They prompted me with ...
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What's the risk if I accidently type my password into a username field in a website? [duplicate]

On websites that separate the screens where username and password are entered, such as GMail, it is possible that the users type the password in the username field because the username is sometimes ...
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138 views

Smartphone fingerprint plus iris scanning for login

I have often thought about the fact that when intimate relationship partners live together they eventually tend to sneak over your shoulder and gain access to your password on either your mobile phone ...
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Potential Risks Using Reference Code Based Authentication For Web Based Application Form That Contains SSN [duplicate]

I'm currently building a web based membership application form that will require a user to enter an SSN and other identifiable information. Part of the requirements of the membership application is to ...
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Is this implementation of a bcrypt EtM flawed?

I know that you should never roll your own crypto, but I'm just implementing/combining(?) two highly trusted algorithms into Javascript First, I am using a bcrypt implementation that I did not code. ...
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326 views

​Multi-factor Out of Band Token authentication options suitable as per NIST recommendations 800-63B (published in June, 2017)

In our web application project we are required to establish MF authentication with combination of memorised secret token (password) and Out of Bound token. Earlier we were planning to implement SMS ...
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386 views

In what cases is it ok keep a user logged in or provide auto login if an app starts?

I am wondering what the difference is between WhatsApp and my Bank application, and what considerations determine what is the right approach to handle user authentication. WhatsApp: I create my ...
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Authorize transitive communication between applications on behalf of the user

I'm trying to wrap my head around to following web security question for a while now. Say we have a system set up as depicted in the picture below. There is one main application with which the user ...
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iCloud Security Concern: browser session authentication storage after 2-factor?

Does anyone know how Safari or Chrome stores a www.icloud.com session authentication after logging in and passing 2-factor authentication? Is it stored in an encrypted cookie? My concern is, if ...
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399 views

Is this login flow via an authenticated email account safe?

I want to have users log in by entering an email, and then proving that they control that email. I only care that they do control the email, and so want to avoid add another password to the process if ...
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974 views

Using Fido U2F or similar as primary authentication method?

I've been wondering about this for a while, but couldn't find much on the web, so I hope that someone could point me in the right direction for better understanding about this topic. Would it be ...
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What is the difference between authorized_keys and known_hosts file for SSH?

I am learning the basics of SSH protocol. I am confused between the contents of the following 2 files: ~/.ssh/authorized_keys: Holds a list of authorized public keys for servers. When the client ...
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52 views

Reasonable security measures for unvalidated “login”

Sorry, kind of a long question. I am hoping that someone smarter about InfoSec than I am will read what I'm doing and give me guidance... Background My website allows psychiatrists to track their ...
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272 views

Remember me feature: do we need a server side token if the cookie is signed by the server?

Every resource I find (I, II, III) about how to implement in a secure way the typical "remember me" login feature, recommends storing a user identifier and an associated unique token in the cookie, ...
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274 views

Is it safe to help a stranger login to gmail using my phone number?

I was assisting a man at the public library who was unable to login to his gmail account. He typed in his password and was prompted for a phone number, presumably so a code to be sent which would then ...
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Why does ssh `known_hosts` file need server name?

When I push/pull repos on GitHub over SSH, sometimes there will a message about unidentified server and asks if I want to trust and add it to known_hosts. Apparently this is because GitHub has ...
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authentication file sharing with qr code

I want to share a file for viewing purposes to customers. The qr code will be imprinted on the product, so the customer will be the only one with access to it. The file should not be accessible to ...
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359 views

Secure preshared key 2 way authentication

I have the following setup: A server and a client will be connected over tcp. The server and client both have access to the preshared secret key. When the client connects to the server, the client and ...
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692 views

Are Authy's tokens insecure?

I've been trying out Authy, a Google Authenticator alternative with an optional feature of being able to back up your tokens. They have two types of tokens: Authy-generated tokens and the regular OTP ...
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2answers
127 views

Authentication using a digital signiture

I'm new to the world of digital signatures and encryption and I'm trying to learn more. I was wondering, how or if an authentication process (login or sign-in) can be performed using a digital ...
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Non Confidential OAuth2 flow

I've been going through some documents regarding OAuth2 confidential and non-confidential authorisation flows, namely this and the RFC. From my understanding, the non-confidential flow does not ...
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Does word store my passwords in plaintext? [closed]

I have a document which I wrote my passwords in and saved it to my disk, and I have been hearing a lot about programs storing passwords in plaintext Did word store my password I saved in plaintext??? ...
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1answer
131 views

Malicious Google Drive Links

Curious about a new form of spam I've noticed in my inbox. Someone seems to be using my email address to fill-out forms on sites, so that I receive the bounce back message. In this message there is a ...
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Why do we ask for a user's existing password when changing their password?

In a web applications context, when a user wants to change their current password, generally they would have to enter their current password first. However at this point, the user has already been ...
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Could SQRL really be as secure as they say?

I just came across https://www.grc.com/sqrl/sqrl.htm With Secure QR Login, your phone snaps the QR code displayed on a website's login page . . . . and YOU are securely logged in. This seems ...
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191 views

Kerberos composite authentication that reflects user's origin

I'm experimenting with Kerberos and was wondering if some sort of composite authentication that identifies both a user and the origin of the users request was a) possible and b) implemented anywhere....
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OAuth access token/API key patterns for large web sites

First off, let me preface this post by saying I'm not a security expert. I'm trying to build regular expressions to find OAuth 2.0 access tokens and API Keys for common web sites such as Google, ...
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Is there any privacy- or security-relevant difference between FIDO2 and SQRL

I just learned about FIDO2 (WebAuthn) and try to make a comparison to the lesser-known novel SQRL authentication scheme. Both seem to use the same key elements: a private, user-resident "master key" ...
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Is a web app vulnerable if it only uses session token in cookie to authenticate a user

I am new to bug hunting and i came across this website, so i came across this bug or atleast what i think is a bug so help me understand and tell me if i should consider it a vulnerability. The ...
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Is it possible to crack a CRC value for short text validation when someone tries to change a readable text?

I'd like to validate message texts with CRC-8/16/32 but I'm afraid that they could be changed to another one (for example, adding a "No" at the beginning). There will be no special characters besides ...
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How does a server validate the Certificate Verify message in SSL/TLS?

Client authentication may be used in a SSL/TLS negotiation. For this, the client will send a Certificate Verify Message after the server requested it. The Certificate Verify Message contains the ...
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868 views

When is it okay not to use anti-forgery token in login page?

In this post, there is a paragraph that mentions a scenario where there is no need to validate anti-forgery token in login page: When is it OK to leave off the anti-forgery token? In general, if ...