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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27 views

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 ...
34
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7answers
4k views

I almost searched my password, but didn't press enter. Is my password at risk, because of autocomplete or anything else?

Without even thinking about it, I typed my password into the Google search bar, but I didn't press enter. Since autocomplete is on, does that mean my password has been logged or indexed somewhere? ...
2
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1answer
63 views

How to get around hard coding a PFX password

I've got an application that acts as a SSL server. I've got the pfx file and in code, I've had to hard code the password to use in the following way PKCS12_parse(p12, PFXPassword, &pkey, ...
1
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3answers
41 views

Is there an added benefit to authentication within a part of an application, after authenticated into the main application?

Essentially I have a application that is 2 parts. One part is on the user's machine, which will upload files to my server, and the other part is a web application that works with those files. ...
34
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4answers
4k 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 used by a registered user on a website. So, for instance, when the user asks to reset his password, you ...
0
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0answers
37 views

Does an account with a !! /etc/shadow entry have to still expire?

Currently where I work, our password policy is set at 84 days. This is set in our login.defs on all of our Linux machines. We have policies that are set around PCI DSS 3.1 and the like, this goes for ...
2
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1answer
80 views
+50

Authenticate tracking device with TCP server

I am building a tracking device and am looking for a secure authentication method to use when the device wants to establish a connection to the server. The server is a TCP server that we open a ...
0
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1answer
88 views

Sharing access-tokens in response header?

What's the best way to share my access tokens, I mean, is it okay to share it in the header as plain-text? - Or do I need to look into e.g.: JWT? Current workflow: -> POST /api/login -d {**creds} ...
3
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3answers
104 views

Are login pages with no retry counts/lockouts a security risk?

I found a login page for a city/edu organisation that has no session times, no retry counter/lockout, and no delays if too many tries are made in a certain timeframe. I am able to exploit this to get ...
0
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1answer
53 views

SAML token and service calls

I am working on a tablet application and have come across an interesting issue We have a domain joined tablet that runs a Windows Store Application, we already have user identity and we need to call ...
2
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1answer
47 views

Is installation id secure enough to authenticate device's user against a Web Service API?

...or interactively asking for password / or having some certificate is inevitable? Context My Android app wants to do secure transactions via my Web Service API. However I do not want to bother my ...
2
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1answer
126 views

Enter the password outside the password field

If I press Tab twice after enter my username, I will type my password somewhere outside the password field. Are there any chances for somebody to catch my password when I enter it outside the ...
1
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1answer
78 views

Should VPN passwords be stored in plaintext?

I know nothing about setting up a VPN, but it happens that I use a VPN add-on for Firefox, and that the VPN provider stores the user password in plaintext. Last week I installed a VPN add-on for ...
1
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0answers
23 views

OAuth 2.0 Resource Owner Password Grant - Handling of Access Token Upon Logging Out

I am new to OAuth 2.0. I used BShaffer's OAuth PHP Server on Authorization Code Grant, and I understand that the client application can have its OAuth token separate from its session authentication, ...
0
votes
2answers
72 views

Is open source a good option for cryptography libraries? [on hold]

I am trying to find good cryptography library to use with my project. I found open source options like openSSL and many more and also proprietory options like Intel Integrated Performance Primitives ...
1
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0answers
22 views

SSH Keybased authentication using NitroKey

So I'm fairly new to more secure forms of key management, I've been used to storing my keys inside key files on my computer. Recently I wanted to try and see if I could setup SSH authentication to my ...
1
vote
1answer
41 views

Is it secure to refesh a JSON Web Token (JWT) auth token using the user credentials?

As I understand the answers to this question JWT: Is refresh an expired token is a good strategy?, one should use a refresh token to refresh an expiring auth token. Since my web app should be ...
0
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0answers
28 views

security authentication protocol [duplicate]

I'm "creating" a secure authentication protocol for my system and it is this: C-> S C S-> C N(once) C-> S Kc,aut[N] S-> AUT Ks,aut[C,Kc,aut[N]] AUT-> S Ks,aut[N] the line : X ...
1
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1answer
53 views

Secure WebApp authentication

I know there are many questions about hashing passwords on the client side out there, but none of them, which I found, address my use case. My app will be end-to-end-encrypted and it is not an option ...
0
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3answers
70 views

Is it a good idea to let a database do a password check?

Setup A server running a PostgreSQL database and an Apache with several php applications. Access to db is over the loopback interface. The db contains a table with the username and SHA-512-CRYPT ...
58
votes
9answers
16k views

Generic error message for wrong password or username - is this really helpful?

It is really common (and I would say it is some kind of security basic) to not show on the login page if the username or the password was wrong when a user tries to log in. One should show a generic ...
1
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2answers
80 views

memorable word and answers to security questions when resetting password?

Context We have a situation where we are allowing our users to login using either using Username & password + Memorable word OR Username & Password + answer to Security questions depending on ...
3
votes
2answers
163 views

NFC - Felica / NXP (Desfire EV1) or ACOS3 which is more secure?

I am new to NFC, and just have been researching on security from different manufacturers, trying to find out which system is more secure with their password protected area. I only know that Desfire ...
1
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2answers
91 views

Should users be allowed to reuse/recyle the same login credentials across a network for different systems?

Should users be allowed to reuse/recycle the same login credentials across a network for different systems? Should this be disallowed/discouraged, or are the security implications minimal? If it's ...
26
votes
2answers
7k views

Is there a standard for printing a public key as a barcode?

Is there a standard for storing a public key printed on paper? Say, I want to hand out business cards with my public key pre-printed on them at a key signing party to help build the web of trust. My ...
6
votes
2answers
129 views

Mobile API Authentication

I'm trying to design an Android Analytic service where every user's application who register in this service needs to download our SDK. The SDK itself need to communicate with our API server. The ...
0
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0answers
18 views

PostScript/Jet Direct port TCP 9100 mandatory for printers?

I'm trying to acquire more knowledge on the topic in order to find and fix a few security issues on printer infrastructures to prevent misuse, pranks and secure all data in it. Currently I have a few ...
1
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1answer
49 views

Attack Challenge/Response Authentication by requesting challenges

If a client/server application uses a challenge/response pattern for authentication, e.g. SCRAM or alike, it often involves the usage of nonces (client nonce and server nonce) for preventing replay ...
3
votes
2answers
615 views

Facebook iOS SDK Authentication

The Facebook iOS SDK only needs your bundle & app IDs of your iOS app to match those of your Facebook app. If I find out an app's app ID, can't I just create another iOS app with that app's ...
3
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0answers
56 views

Secure a server on `localhost` such that only the authorized users can connect

Consider an application (such as an IPython notebook) that runs an HTTP server, and that (by design!) allows arbitrary code execution by authenticated users (this is the entire point of IPython, ...
12
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1answer
1k views

MPPE-Send and Receive key derivation from MS-CHAPv2

I am trying to get the MS-MPPE-Send-key and MS-MPPE-Recv-key from the MS-CHAPv2 challenge material. I am able to follow the RFCs 2548 3078 and 3079 to the step of getting the GetNewKeyFromSHA() it is ...
0
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0answers
4 views

How does ssh choose the correct key to use? [migrated]

How does ssh-agent understand which key should it use for which remote server? I've came across different questions and posts that touches this topic somehow, but it still remain unclear to me. What ...
0
votes
3answers
181 views

Is it secure to return a JWT to an already-logged-in user?

I'm using JWT to handle an SSO scheme where two systems (let's call them A and B) both require authentication, but the user datastore is in one system only (let's say A). Everything I've seen about ...
0
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0answers
21 views

Securing device communication with API back-end with no user interaction

We have remote devices programmed in Python that talk to our back-end to update our database with information gathered from sensors connected to our remote devices. The remote devices are not ...
1
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1answer
58 views

Can Passpoint X.509 certificates be used to MITM SSL connections on Passpoint networks?

Passpoint/Hotspot 2.0 public networks like LinkNYC require users to install X.509 certificates, for EAP authentication. Can these certificates be used by the provider to execute man-in-the middle ...
1
vote
1answer
70 views

securities concerns about calling REST API from multiple servers

There is a master web application that needs to call REST APIs from servers of other applications. I can think of two ways to achieve it: a). call APIs on the front-end of the master ...
2
votes
3answers
121 views

Could a spoken (TTS) SMS-based 2FA be intercepted?

In mid-June, Lastpass made news again, and I've since been mowing around the idea of two-factor authentication. After familiarizing myself with SMS and Google Authenticator, I thought the SMS was a ...
-3
votes
3answers
1k views

Two-factor authentication Without Mobile Phone

Two-factor authentication is based on the notion of “something you know” and “something you have”. Is it absolutely necessary for having your mobile phone involved in two-factor authentication, which ...
1
vote
1answer
1k views

What is a AUTH-KEY in the security of the computers?

I'm studying security in computers and in particular the URL Spoofing. I understand that a form of URL spoofing is phishing. Then I read that a countermeasure against phishing is the authentication ...
2
votes
1answer
90 views

Can data coming into my UDP server be sniffed?

I have made a small tracking device. I am trying to reduce the data overhead as much as possible to make the device very cheap to run. We are working on the basis that 1MB = £0.01 (the data price at ...
3
votes
0answers
68 views

Thoughts on my JWT implementation

So I've been trying to learn as much as I can about JWT tokenisation, and auth0 seems to be the defacto JWT information hub. However, the more I read about refresh tokens, the more I cringe - the ...
0
votes
1answer
666 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 ...
0
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2answers
67 views

Challenge authentication without roundtrip

Is it possible to have a secure challenge/response authentication protocol, authenticated immediately? Too slow: a client request -> server challenge -> client response -> server response Fast ...
2
votes
3answers
2k views

CORS & CSRF Prevention for an REST based API

I'm currently trying to wrap my head around how to prevent CSRF. My first solution was to use a token which is suggested everywhere. That would of course fix this problem: <img ...
0
votes
1answer
186 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 ...
0
votes
0answers
49 views

Benefits/negatives of password-less authentication

I am facing the following dilemma: I have a client who has a very basic admin panel, he uses this once or twice a week and cannot do much, mainly update content and add products. Currently, the ...
1
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1answer
130 views

3rd Party Authentication protocol

I have a hardware device (H), phone (P) and web server (S). I would like P to be able to send commands to H, but only if it is authorized to do so. Permissions are stored on server. Technically I ...
2
votes
1answer
330 views

Is there any security risk, if the database with key handles for U2F devices are leaked?

Is there any risk, if a database of U2F device key handles are leaked? Enrolling a key works by: Send Enroll request with "AppID" to U2F device. U2F device answers with "Key Handle, Public Key". ...
2
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1answer
85 views

Email code authentication

I'd like to replace passwords with a temporary code that's emailed to the user. The login flow would go like this: User enters their email address. "If that email belongs to a user, a code will be ...
3
votes
1answer
3k views

SIP Provider stores credentials, is it required for some SIP phones?

My SIP provider stores my SIP call time password as AES encrypted in stead of hashed. I understand that SIP authentication has the capability to NOT store the password, and in stead store a ...