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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3
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2answers
439 views

intrusion detection on own hotspot?

Is it possible to detect failed logins on the hotspots you create with your windows/linux laptops? So you can detect some dumb brute force/guessing attempts? For example, a log like this: TIME DATA - ...
8
votes
3answers
504 views

Location to store an encryption key

I'm building a secure system which stores messages on a server in a Postgresql database. The messages are stored encrypted with PHP's openssl_encrypt() function with the AES-256-CBC method. At the ...
7
votes
2answers
919 views

Kerberos authentication over the public internet

What are the threats to having the KDC accessible via the internet for remote clients? It's my understanding that the authentication is a challenge/response protocol and that the password is never ...
3
votes
2answers
226 views

Disable local/KVM access on a Linux VPS (allow only SSH)

Friends of mine have previously had issues with VPS security. The security was no fault of the operating system/services themselves, but mainly due to the "Control Panel" that gets forced upon you ...
34
votes
6answers
1k views

Is the concept of Authenticated Anonymity possible?

Or is authentication essentially incompatible with anonymity? If we have the idea that authentication is proving that someone is who they say they are and anonymity is essentially having an unknown ...
10
votes
4answers
6k views

Preventing deauthentication attacks

I am helpless against some kiddy with backtrack who repeatedly uses aireplay-ng to deauthenticate legitimate users on my Wifi work network. I captured and analyzed the network traffic on my Wifi work ...
32
votes
2answers
1k views

Why does Google cripple the 2FA Google Authenticator PAM module?

If you enable 2FA for Google Apps the shared secret is 160 bits. The google_authenticator PAM module on the other hand seems to use 80 bits for the shared secret. According to RFC 4226: R6 - The ...
5
votes
3answers
13k views

Four-way Handshake in WPA-Personal (WPA-PSK)

Can someone explain to me in what consists the Four-way Handshake in WPA-Personal (WPA with Pre-Shared Key), which informations are being sent between AP and client, how is it possible to find the AP ...
1
vote
1answer
130 views

Sharing login session from one website to another?

Given two companies managing two separate websites, the client wants the user to be able to log in to one website, and then click a link to navigate to a certain part of the second website. The client ...
3
votes
1answer
107 views

Should an administrator be able to turn off TFA for a user

We use Google Authenticator and SMS for two factor authentication. Should we allow the administrators of the site to turn off TFA for users? Google Auth uses SMS as backup option but SMS does not ...
9
votes
7answers
428 views

Authencity of information displayed on an untrusted device

Suppose I have a (bluetooth/usb) device which needs to displays information on an external pc/phone. Is there a simple and effective method to garantuee that the information displayed hasn't been ...
0
votes
1answer
56 views

Using multiple hash-functions along the line [duplicate]

I was wondering what the effect on strength/security is If I would use an aggregate of multiple hash-functions. For instance, I don't want to sent passwords in plain text (although it's over an ...
2
votes
1answer
125 views

After having confirmed a computer is infected by a Botnet.

And having found a server IP that is controlling it. How can I find out the log-in credentials this client uses to log in to a IRC channel / server webpage / control panel. I have found out a python ...
1
vote
2answers
263 views

How to write a rock solid TOTP implementation?

I am currently writing a TOTP implementation in PHP (but this applies to other languages as well) and of course want it to be as secure as possible, what should be considered? After reading the ...
1
vote
1answer
741 views

Why is a CA certificate required for EAP-TLS clients?

When setting up clients with WPA2 EAP-TLS, most clients (ie: my phone, my computer) require both a client public/private keypair (for obvious reasons) and a certificate authority certificate. It's ...
4
votes
2answers
310 views

Windows Authentication and Session Ids

After a penetration test made upon an intranet application I'm developing, in ASP.NET MVC, one of the concerns raised was that the application supports concurrent user sessions and it is recommended ...
0
votes
2answers
536 views

How does Authy works?

I think I knew how does two-factor authentication works. I enter the password. Server generate random number and send me it me by sms. I enter this number. Server check number I entered with ...
2
votes
5answers
269 views

Is asymmetric encryption vulnerable to man-in-the-middle attacks?

I'm looking for ways to send private messages over a public channel, and in doing this I stumbled in asymmetric encryption, which is just perfect for what I was looking for at first - A and B ...
0
votes
2answers
327 views

mutual authentication between two clients

I understand how mutual authentication works between a client and a server, however I am unsure how I would be able to get mutual authentication between two clients A and B? What would be the best ...
2
votes
1answer
77 views

Does it make sense to use two factor authentication with password protected wp-admin folder?

I've finished building my wordpress website and now, I'm concerned about the security of the website. To improve security, I'm using Google two factor authentication plugin while also ...
3
votes
3answers
118 views

How to make authenticity of text verifiable without third party services?

There is a person who wants to establish a system which allows her/him to publish texts anywhere and make it verifiable that s/he is the true origin of that text. Only the first message is not ...
0
votes
2answers
372 views

Look over my Web API Authentication Scheme

I want some advice on my Authorization/Authentication scheme that I will be using for my Web API that I am writing. Firstly the Authentication : 1) When a user first logs in and they are authorized, ...
0
votes
2answers
97 views

Do I need to password protect [web] services that are only accessible internally?

I have transmission-daemon setup with RPC enabled using a whitelist. The whitelist contains only 127.0.0.1 and my virtual private network range of IP addresses. I connect most of my devices through an ...
3
votes
3answers
326 views

Proper Linux user authentication through PAM aware applications

Currently I'm building an authentication system using Linux PAM for a python daemon process. It will need to authenticate remote users from a variety of front-ends against the local user list. ...
17
votes
4answers
989 views

Disclose to user if account exists?

Someone told me it shouldn't be possible for someone to detect if a certain email address is a registered user on a Website. So, for instance, when the user asks to reset his password, you should say ...
2
votes
2answers
117 views

How bad is exposing valid user names?

Today like many other times in the past, signed for a new service and got a common error message: Your user name or password is invalid This time I am wondering how useful it is to notify ...
3
votes
1answer
2k 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.
2
votes
4answers
461 views

Does using WPA2-Enterprise just change the attack model vs WPA2-PSK?

As far as I can tell based on the reading I've done so far, WPA2-Enterprise uses the same encryption and security algorithms and methods as WPA2-PSK, with the addition of using another service for ...
7
votes
2answers
272 views

What's wrong with this authentication system?

I'm a software developer with an interest in and basic level of knowledge about security. I've come across an authentication system that "smells bad" to me however I lack the expertise to know what if ...
3
votes
3answers
261 views

Does Google/Dropbox/Github Two-Step Verification count as Two-Factor?

This considers the route where somebody does not use the SMS option, but rather using TOTP, and the site offers a generated seed to input. Two factors questionably at use: password: something KNOWN ...
4
votes
1answer
167 views

'Remember Me' combined with Auth Token

I've developed a client application which talks over a REST API to a server. The way the application works is to send the username/pwd pair in the initial login to the server and then respond with an ...
3
votes
2answers
289 views

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?
1
vote
1answer
75 views

When is it appropriate to challenge with a secret word?

Lets say a secret word is say, the name of your first pet. Mother's maiden name is also a common one. When does it make sense to challenge the user with this? Or, what actions should be secured by a ...
2
votes
3answers
192 views

Can a zero knowledge proof of voting be made using a trusted auth server (without client side crypto)?

Questions: Can one implement a secure voting system having all the features described below? e.g. without disclosing any individual's vote to the government server (or the third party), preserving ...
0
votes
2answers
57 views

Challenges in authentications

I have a case where I have a set of low compute capable processors connected to a gateway processor. I need a way of authenticating these processors to gateway processor. The main things are: I need ...
1
vote
2answers
106 views

Securely passing critical data to other domain

My company owns a domain A.com , and subsdiary is on B.com B.com redirects their users to A.com for accounts registrations. Post successfull registration , A.com logins that user ( User doesnt get to ...
0
votes
3answers
113 views

Isn't it less secure to use something you are for authentication?

I have to think of this everyday when I close the doors of the shop I work in, a year ago we used to close the shop and arm the alarm using a key fob this means the worst case scenario was that I get ...
2
votes
0answers
1k views

How are “security levels” of identities in TeamSpeak 3 implemented?

TeamSpeak 3 VoIP communication system uses a concept of so called identities to identify the client to the server. These identities are basically public/private key pairs. In order to prevent people ...
7
votes
3answers
497 views

Why is there a minimum username length?

In some (web) applications there is a minimum length for usernames, usually there is a restriction for a minimum of 6 characteres length. For example, free gmail accounts and miiverse (Nintendo ...
0
votes
2answers
138 views

How to detect authenticity Of Client and Server Certificate?

How its possible to detect authenticity Of Client and Server Certificate. For example, If server A has certificate and someone C stolen its certificate and send it to B then How we decide that it's ...
6
votes
1answer
646 views

What does chacha20-poly1305@openssh.com mean for me?

OpenSSH just introduced a new protocol, chacha20-poly1305@openssh.com, which combines the two algorithms from DJB: ChaCha20 and Poly1305-AES. It was inspired by a similar proposal for TLS, which ...
1
vote
2answers
57 views

Associate guest orders with account if email matches?

A web shop allows orders from guests. When checking out, the guest has to provide an email address (in addition to shipping address and payment data). When this email address is already in use by a ...
2
votes
0answers
164 views

How to verify a message?

I have a 192 bit data string and a 384 bit signature calculated with curve ANSIp192r1 as well as the public key. These readings originate from a SYM2 electricity meter and I would like to ...
-1
votes
1answer
1k views

How can I avoid sending passwords in plain text when logging into a website?

Suppose that I login to a website. When I type my personal data, aka, password and email, the password is sent in clear text to the server, correct? Then, a network card in promiscuous mode can ...
1
vote
3answers
215 views

Should I trust my bank after this [closed]

I have just discovered that I can login to my bank with passwords that is not mine. Example: My password is "1234" but I am authorized with all possible post characters. For example "12345" or ...
1
vote
0answers
47 views

Putty Event Log

Can anyone explain me the Step by step process of Key Exchange that takes place while accessing Linux machine using Putty ? I found the Event Log of Putty but the Various Key Exchange didn't make very ...
1
vote
1answer
57 views

Transport Layer Security for multiple persons

I know that TLS protocol is used to authenticate two persons and when a secure channel is established we can perform a key exchange. My question is if TLS can be used to establish a secure channel ...
3
votes
4answers
250 views

Key-agreement protocol in a REST API

I have a C# REST API which exposes some methods over the HTTP protocol. The API is intended to be used my my Android applocation (Java) which is currently in the makings. Since the app is in an early ...
0
votes
3answers
266 views

Authenticate user without knowing their password

I'm working on a project where each each user will have a public/private RSA key-pair. Users will be able to send encrypted messages to each other using the each target user's public key so that only ...
1
vote
2answers
206 views

Token based authentication under http

I am doing a token based authentication but facing some security problems. In the system, a user will login as follows: Type username and password to login in a https login page If the login is ...