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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Possibility of using CA as an attack point by governmental organizations under their pressure

I was always concerned about the model of trust behind CA stuff we use . Well, for most of us, it is OK to trust them, since they are reliable organizations with a bunch of solid experience. ...
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0answers
17 views

Considerations for distributed authentication with online/offline app?

I am developing an application that will exist across three groups of machines: 1) A central web server. This is a publicly available site accessible via http. 2) Browser-based clients. Any number ...
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2answers
47 views

Securing login form in a desktop app

I currently have a desktop application which requires the user to have a username and a password. These credentials are stored on a webserver (myserver.com), so when he types the username and the ...
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1answer
32 views

How do I force kill an OWA, Activesync, or Outlook session?

A user with a BYOD is still able to access the email system, even after the user account has been disabled and password changed. Since it's clear that a re-authentication event doesn't continually ...
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2answers
64 views

How to transfer securely a file between servers?

Let's say I have two Linux servers. One containing a desktop app database (running on a local network) and a webserver. I want to automatically transfer each hour a database file (with a size of a ...
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1answer
93 views

Strange name on “shared”, was I hacked?

I use a Macbook Air 2013 and I recently noticed a very strange and long line of digits and letters under my "shared" category in finder. When I click on the name, it just says "failed to connect." It ...
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1answer
43 views

Authentication of temporary worker without a badge (physical security) [on hold]

In our company we have a procedure to verify internal worker but we cannot use it for temporary worker. We cannot use badges and because of privacy reasons we cannot use any photos. Is there any other ...
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2answers
32 views

Browser logs into forum with completely unknown credentials [on hold]

The weirdest thing is happening to me today. I visited a forum for the first time ever and browsed some posts - WITHOUT REGISTERING. A few hours later, I reopened the page (wanting to register) and ...
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1answer
61 views

Why recommend “letters, numbers, and special characters” in a User ID?

Why do some sites recommend "letters, numbers, and special characters" in a username or User ID? When creating a User ID at the www.discovercard.com website, the "User ID Strength" indicator meter ...
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1answer
18 views

Choosing right way to secure access to server access via socket

I have an application running on a server, that has an exposed socket to the Internet to communicate with client that is/are application(s) on a phone. How would one go about properly securing the ...
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41 views

Implementing simple authencation based on random number generated [closed]

I have an application in which, i want make some admin options to be controlled by super Admin's permission. Currently , i have framed a simple flow/expectation how this is to be done. But, for this ...
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0answers
9 views

IdM on apps we host for a client

We're looking at hosting some of a client's existing applications in our environment. My current thinking is we will have an encrypted channel back to the client's network over which authentication ...
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1answer
51 views

Password Storage with Jasypt StrongPasswordEncryptor vs PBKDF2

We are currently working on authentication for a web application. For password storage, we're using Jasypt StrongPasswordEncryptor with SHA-256 and tens of thousands of iterations. Going into the ...
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1answer
55 views

Certificate validation with 802.1x PEAP

I recently learned about how WPA-PSK works. If I understand correctly, the 4-way handshake enables the protocol to ensure mutual possession of the PMK (and therefor, the PSK) without sending the ...
0
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1answer
86 views

ssh always too many authentication failures

No matter on which server I try to connect via password login, I always get the error message Too many authentication failures for If I have exchanged the ssh-keys, I can login without password as ...
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4answers
123 views

Why must every OTP be unique

All OTP systems that I have observed, send a new OTP every time a user requests for an OTP. (for example whatsapp) Only the latest OTP is valid and an OTP can only be used for X hours. I am wondering ...
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0answers
11 views

How to test ldap that authenticates with kerberos

I want to test an ldap directory with ldapsearch. No passwords are stored in the LDAP directory. Account passwords are stored in Kerberos and LDAP contains a pointer to the Kerberos principal. The ...
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2answers
79 views

Where is the identification process when I use a key fob to unlock a door

I can understand that typing my user name on the computer is "identification" and providing the password is "authentication" but when I use a smart card or a key fob I see no identification taking ...
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1answer
70 views

Is it safe to use virtual mobile numbers for verification

Is it safe to use virtual mobile numbers for account verification & authentication for services such as PayPal, Twitter, Gmail, Linkekdin, etc.? And what is the security drawback for this?
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4answers
146 views

Authentication with an untrusted server

I asked a related question earlier, but I want to ask a broader version this time: To simplify things let's say I've developed an application that allows users to send messages in a chat room, and to ...
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2answers
56 views

Are there any flaws in my design for a paper-based OTP grid?

I'm trying to implement two-factor authentication on the cheap for a website of mine. My bank uses this sort of grid-based OTP system, so I wanted to emulate it in my application: Cards are ...
0
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2answers
76 views

Security issues in “Remember Me” function code example

I'm a beginner, and these may be very obvious for you, but I'm trying to understand if there are security issues with this example. Today on Stack Overflow, I saw the following post: PHP Sessions ...
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0answers
18 views

Should Javascript & IFrames be used to refresh sessions when Master Cookie Domains are used?

Suppose I have 3 sites that I want to have SSO in, site1.com, site2.com, and auth.com. SSL is always required. According to how SiteMinder cookies are described here, one of those domains would ...
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3answers
94 views

“Remember me” cookies - did I implement them securely?

I am currently working on a pet project website and I want to implement the "remember me" feature for logins and wanted to know if my procedure is secure. The authentication process basically goes ...
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5answers
146 views

Why after a website password reset am I asked to login again?

I have noticed that every web site has the exact same behavior for their password reset pages. They send a link to your email using which you can reach the password reset page. On that page you enter ...
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1answer
27 views

Are AWS security groups sufficient to authenticate communication between instances? (HIPAA)

Say I have a private service that exposes sensitive information (PHI) via a REST API, and that I want to permit access to it from only one other service. Is it enough to partition these services ...
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1answer
64 views

Native app, token authentication without login/password

I'm working on a always online mobile game (native android/iOS app with Unity) and i would like to be able to authenticate the player without requiring any login/password at the beginning. For those ...
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0answers
72 views

Secure login procedure

I have implemented a login, and session, procedure for a web app and I am wondering whether what I have implemented is secure enough. The authentication is based on login password on https. If the ...
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1answer
40 views

Basis Authentication Protocol: a concrete attack

Below is an informal protocol narration of a simple authentication protocol. A sends to B a signed hash of message M, B's name and a nonce N. B knows that the message M is intended for him, that it ...
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3answers
106 views

Would this authentication method prevent MiTMs getting the password?

Assuming SSL/TLS cannot be used in this context, is this method secure enough to authenticate someone without someone listening to be able to retrieve the password from the information transmitted. ...
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1answer
42 views

Securing fingerprint templates stored on web authentication server

I have a multi-factor web authentication server, that in addition to regular passwords uses fingerprints for user authentication. Can anyone think of a security flaw in the following scenario: I ...
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2answers
89 views

Is a Windows AD credential combined with AD group membership 2 factor authentication?

We have a requirement for 2-factor authentication for our internal WiFi SSID's. Currently we use PEAP w/ MS-CHAPv2 to pass windows creds through the AP to a RADIUS server (A Domain Controller running ...
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3answers
90 views

User Account Guessing [duplicate]

I'm doing some research on user account guessing, and wanted to ask a question about some "bad practices". My thought is generally this is a trade-off between great user functionality/UX and ...
0
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1answer
18 views

Secure automatic authentication to samba share

I need to pull some data from network storage to a publicly available laptop that is running Linux. The network storage used to be provided via a server that could be connected to via ssh, but it has ...
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0answers
73 views

Compromised JSON Web Token (JWT) Bearer Token

We are implementing a REST service that requires authentication and authorization. Because of the stateless nature of REST API's, we want to use JWT to make authenticated calls to the API through a ...
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1answer
35 views

Server + Client certificate vs Server certificate + Client password

There are three different ways how TLS (1.2) can be used: server and client authenticate, only the server authenticates or neither authenticates. If neither server nor client authenticates using a ...
0
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1answer
55 views

How can LastPass enforce 2-factor authentication

I've recently started using LastPass and one of the things you can set as a policy for you password vault is Prevent offline access when using Google Authenticator. The local cache can be ...
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1answer
54 views

Auth / Login token schema

According to this answer, a valid login token schema would consist of the username (U) the time of issuance (T) and secret key K owned by the server only The suggestion then is to concatenate the ...
43
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1answer
3k views

How does a SIM card prevent cloning?

I have read a few articles about SIM cards, stating that the chip inside them uses some cryptographic magic to prevent people from cloning your number. This to me seems borderline impossible, given ...
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1answer
40 views

Better way to store user authentication on phone app

We are creating an app and registration of user happens in following way. User sends via app: email-id/phone and username. Server sends a pin to enter in app via phone/email. User enters the pin in ...
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3answers
619 views

Websites Forcing Weak Password Standards (Updated) [duplicate]

Please Note: I am not going to name the websites which have these horrible standards for their clients and users. I have had to change my passwords for my routine update just recently in the last ...
4
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0answers
96 views

Security concept for Android app with PHP based REST API

I'm trying to build my own PHP based REST Api for my Android app and I'm a litte bit confused by all the different user authentication stuff one can find on the internet. So I want to present my ...
6
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1answer
84 views

4 bytes authentication problem

I have a classic security problem where Alice needs to prove its identity to Bob but with quite unusual requirements and constraints due to a M2M context. EDITs in bold The communication channel ...
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3answers
147 views

What are the (practical) dangers of writing your own login method?

I have always been told that writing your own login method (e.g. validate user given the username and password) is bad practice, and that one should reuse existing libraries for that. I have always ...
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1answer
102 views

security in banking app with 4 digit pin code and social security number

The new banking app (for norwegian bank Gjensidige bank) for my android handset allows me to log in using only my social security number, and a 4 digit pin code. The social security number in norway ...
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2answers
66 views

OAuth2 - Resource Owner Password Credentials grant

The OAuth2 spec describes the Resource Owner Password Credentials grant type and authorisation flow here. I understand that only 'trusted' client applications would be allowed to use this grant, for ...
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0answers
24 views

Secure access of web application on a newly created AWS instance using the associated keypair

I create an AWS instance using a private AMI (Linux) with an embedded web application (Jetty) which is activated on instance start. As soon as the instance is launched first time, I want the ...
0
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2answers
57 views

client SSL authentication .pem file and .crt files

So I have minimal knowledge of security really but I'm a primary developer on an application which handles some sensitive data that we want to be secure. The application communicates with one other ...
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2answers
71 views

Encryption mechanism

I want to send data over the Internet securely. For that, I am using an public key of the receiver to encrypt the data. In this case, if an intruder in the network modifies the data, like placing the ...
0
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1answer
75 views

Single sign on - is this a secure way to log in?

I am fiddling about with a sort of single sign on procedure. Let's say there is site1 and site2 and both use an SSL certificate. Users are signed in on site1. I was wondering what the experts think ...