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
47 views

With a known secret key, can I determine the response for an authentication challenge?

I am trying to find a response for a 64-bit authentication challenge message (e.g. c055258b829d89bc). Each challenge message is unique. If I know the 512-bit secret key that was used to create the ...
1
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1answer
72 views

Encryption that service provider themselves cannot decrypt?

I recently saw the following message verbatim on an online application I use. The login is simply a login/password combination. There is no oauth, no two factor authentication, etc... This sounds ...
4
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2answers
95 views

Should I worry if I have tried to ssh into a 'fake' dyndns.org site? (with ssh keys)

I often ssh into servers for work and play using dynamic dns with ssh keys that are password protected. Twice now (shame on me!) I have mistyped the dyndns.org part of the address and been greeted ...
22
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13answers
4k views

Why do we even use passwords / passphrases next to biometrics?

In the last couple of days there were a lot of talking about passwords and passphrases, not only here, but on several blogs and forums I follow (especially after XKCD #936 saw the light of this ...
1
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3answers
444 views

Prevent or detect key copy

This question can be classified as somewhat two interrelated questions - or two goals. Main aim is basically to authenticate client to server, but remain secure even if someone steals the key from ...
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1answer
76 views

What type of authentication should I use, basic or digest? [duplicate]

I know that it is strongly recommended to use both basic and digest authentification with https. Many say that if you use SSL, there are no advandages in using digest auth, and basic auth is safe ...
1
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1answer
230 views

Client authentication successful when using a pfx with Java, fails using OpenSSL. Why?

I've been trying to troubleshoot issues with client authentication and am seeing different behaviour when connecting from a Java application vs OpenSSL. A third party has provided me with a pfx, I've ...
5
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1answer
122 views

Connecting via SPNEGO/Kerberos out from domain

Is it possible to authenticate to SPNEGO/Kerberos server in domain A with an account from the same domain (obviously) when the client is connecting from computer in one of the following (quite ...
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3answers
803 views

Do client certificates need to be trusted by the client?

I'm looking for some clarification around the trust requirements (if any) of client certificates. I'm working with a third party to access their services via Mutual TLS. I generate a CSR, send it ...
2
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1answer
85 views

SSH Server Authentication

I know this question was asked several times in several ways, for example: Can an SSH server fingerprint be spoofed? What stops an SSH server from MITMing logins? However, none provided the ...
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2answers
1k views

Improving stateless REST API authentication token - or ditch it for database persistence?

I'm looking to implement stateless REST authentication into an API. I've been reading up on articles here, and have implemented an idea that works, but I was hoping to get some feedback on its ...
2
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1answer
96 views

How to achieve authentication using symmetric cryptography

Here, message authentication is defined as A MAC authenticates a message. If Alice sees a message and a MAC and knows the associated secret key, she can verify that the MAC was produced by a ...
2
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1answer
92 views

Handling Authentication without a unique username or password

Working on a project and I have to authenticate a user that does not have a username ( '' ) or a password ( '' ). There are users and guest_users, but a guest_user won't have to explicitly log-in, ...
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0answers
28 views

fakeauthentication is working when my belkin belkin router f7d2301 mac-address filtering enabled

Actually i have enabled mac-filtering in my belkin router and the security policy is none and the authentication is open authentication. Iam(attacker) using kali linux. when i done a fakeauth attack ...
2
votes
1answer
156 views

Use salt as identifier for crypted session id in database based authentication system for webapp

I have written a database-based authentication framework for webapps I am planning to program in the future. The framework is implemented by using the plpgsql-language of a PostgreSQL-Database and ...
0
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0answers
36 views

Is it appropriate to request a bounty for finding exploit on major site? [duplicate]

Long story short, I found an easily reproducible, very easy, and honestly embarrassing exploit on a major (yes, major) financial institution's online banking site today. It's not directly tied to ...
2
votes
2answers
108 views

Log User In Automatically After Clicking Account Activation Email

Scenario: Forum account registrations, user must click an activation email after they sign up e.g. they create an account with username, email, password, and an email is sent to the email they select. ...
3
votes
1answer
79 views

Using the password, among other values, as key data in two-factor authentication

I'm writing an implementation and a thesis about two-factor authentication, and am currently doing some research. I'm currently looking at an implementation for deterministically generating a ...
52
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6answers
6k views

Has a benefit been demonstrated for credit card machines asking for ZIP code?

In the U.S., many credit card machines at places like gas stations have started asking for your ZIP (postal) code to use a credit card ostensibly to help verify that you really are the cardholder, ...
1
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1answer
40 views

Authentication system for a web service

I am building a web service which i will be launching in near future. Service is more or less like online classifieds. Now, i need to build a mechanism to collect user's information, enough to trace ...
3
votes
1answer
2k views

How to supply HTTP Basic Authentication details in OWASP ZAP proxy?

I am using Basic HTTP Authentication to log into my Web Application. The credentials are Base64 encoded and sent to the Server. OWASP ZAP Proxy is intercepting the request and I can see the ...
1
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0answers
33 views

Is our internal SSO design secure? [duplicate]

We use one primary web app that was built internally and 3 other web apps that we did not build but that we do host. I want users to only have to sign into the primary web app, which uses Google auth. ...
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1answer
57 views

When I visit a site using HTTPS is it exposed to sniffers? [duplicate]

Say for example I visit https://foo.com. Could someone that is sniffing the network determine that I am going there? At what level does the https encrypt the request? I know that data is secured ...
2
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0answers
39 views

How does Adobe Pass Auto-Authentication work?

At time marker 2:05 of this video, he describes that Adobe Pass can automatically identify you based on your broadband provider, and sign you in/authorize you for media content. Can anyone describe ...
2
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0answers
103 views

Security token in android and embedded system

I have an embedded board with a very limited processing and memory resource. I would like to control the board using an android app. The users are categorized into 3 groups: owner of the board. ...
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3answers
1k views

Do we still need to encrypt/decrypt data in Application Layer, despite using TLS/SSL?

Actually I got some projects from my ex-colleagues. These are App-Server TCP socket based applications. I noticed that some of auth/login interactions are using RSA/AES encrypt/decrypt as I know, if ...
3
votes
3answers
1k views

failed login attempts analysis

Is there any open source project that logs all the failed login attempts over a period of time and gives me analysis of the same, the login failure is at windows or unix or mac user authentication ...
2
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1answer
76 views

SSL Client Authentication Failure

I have a setup where the client wants to make https call to the server. The client has a certificate installed on the machine The trust chain of the cert: Root CA      ...
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2answers
145 views

What are some Linux commands for genrating and verifying digital signatures?

I am attempting a workflow to exemplify the process of digital signature using asymmetric cryptography. If I understand correctly then the public key and the private key in an asymmetric ...
3
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1answer
107 views

Public Key Certificate Pinning and MITM attack

So I was looking at an example of how to implement public key pinning for when your app connects to your web service and you want to have your app ensure it's really talking to your server. ...
5
votes
1answer
117 views

If I obtained a username and the salted password pairs from a server, can I login?

I am studying Salted Challenge Response Authentication Mechanism (SCRAM). According to the description at https://tools.ietf.org/html/rfc5802#page-8 it seems that the Client does not have to know ...
3
votes
4answers
81 views

How to Protect Webservice on Private Network?

We are building a webservice that will only be queried by other servers on our private network. I was suggesting that we put that webservice over https and use either client ssl authentication or a ...
1
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1answer
23 views

Auto log-out sequence based on inactivity on desktop devices

Applications that monitor user activity may log out of the app if there is no user activity in the app for more than kLogoutInterval period. This value could be 1 or 5 or 10 15 minutes based on the ...
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3answers
254 views

Vulnerabilities despite FIDO U2F?

FIDO U2F seems much more secure than one-time-passwords (OTP), especially TOTP, because of the challenge-response architecture. In what ways is a U2F user still vulnerable? I presume if a user's ...
2
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1answer
102 views

OTP on the same device being used to login

I've seen mobile apps use two factor authentication by sending an SMS to the mobile phone. However, if I've stolen someone's phone, where is the security advantage? I can understand it if it's used in ...
1
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0answers
51 views

How are FIDO and NSA (Natural Security Alliance) different in biometric security? [closed]

Fido Alliance and Natural Security Alliance both work on certifications of biometric authentication. How are those different / complementary? What are their targets for making business for themselves? ...
3
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1answer
66 views

Does providing non existant users with fake salts prevent user enumeration?

Background I'm currently setting up a basic username & hash based login process for a web application. The process consist of the following steps: User submits their username. Server responds ...
69
votes
7answers
24k views

How hard is it to intercept SMS (two-factor authentication)?

A lot of two-factor authentication mechanisms use SMS to deliver single-use passphrase to the user. So how secure is it? Is it hard to intercept the SMS message containing the passphrase? Do mobile ...
6
votes
1answer
945 views

Message signing disabled (dangerous, but default)

Over the last couple of years, I've developed a fairly keen interest in Penetration Testing & Information Security. Throughout this time, I've acquired (and accumulated) a range of different ...
15
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4answers
8k views

SSH key auth, but still need password for sudo?

SSH with public-private key authentication comes enabled by default with most Linux distributions. This is great because when I create accounts for remote users I don't have to email them sensitive ...
4
votes
1answer
452 views

How is JWT implemented?

I'm using django-rest-framework-jwt in one of my APIs. As you might know, the concept is simple: you send username and password and you get a token back. The token is not stored anywhere on the ...
4
votes
1answer
876 views

Randomly generated token vs JSON web token

I'm trying to secure access to my web server. I have been implementing a JSON web token authentication where I randomly generate a secretkey and associate it with that user. The secretkey will then ...
1
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0answers
126 views

Peer Entity Authentication and Data Origin Authentication services in OSI layers

What kind of Peer Entity Authentication and Data Origin Authentication services are provided in network layer(L3), Transport layer(L4) and application layer(L7) ?
2
votes
4answers
123 views

What is the risk of different responses when a login username matches or not?

I am responsible for a website that allows a user to reset the password, as usual. However, the response of the website is different whether the entered username matches or not. This would allow an ...
4
votes
2answers
127 views

How much data should I store on a user's computer about their login info?

I'm currently saving a user's "login" information (not their raw password, of course!). Every device/browser gets its own secure ID from the server, all well and good. However, should I verify more ...
2
votes
1answer
98 views

Why is the 2nd step in two-step authentication not a single click? [closed]

The case I'm using Google 2-Step Verification. The question Why does Google use a code as second step? Why not just an android app where you can click "It's me"?
3
votes
2answers
158 views

How to 'pair' a client/server application securely?

Please forgive me if my question is a rephrasing of a common problem, but I am not sure what to search for! My use-case is a client-server program. The server runs on a user's PC and the client runs ...
7
votes
1answer
209 views

“Fix” man in the middle

I've just tried to ssh connect to a server (auth via ssh key), and get the well-known message WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!. I'm the server administrator (but I'm not really a good ...
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4answers
2k 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 ...
6
votes
7answers
1k views

How do I secure my login page?

The login page is the starting point to any web site and the most important thing to authenticate the user. When I begin to build any web application, I take a lot of time to think about how to ...