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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23 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 ...
1
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1answer
49 views

LastPass authentication grid hacked on June 15?

I wonder how safe LastPass's grid authentication is. I take it that they have a copy of the authentication grid on their server. You are supposed to print the grid and carry it with you to any device ...
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1answer
181 views

Publicly Available API + Sensitive ID/Key Transmission Over HTTP

I've run into a predicament... I'm developing a mobile application that utilizes a server for various things. One portion is that it stores an id/key pair related to accessing and processing ...
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1answer
37 views

Staying logged in as a user for remote access (such as Team Viewer) Pros & Cons

This company we newly help have no remote access policy for say, but they allow the users to use Team Viewer. I have noticed some user leave their PC logged in all night and weekends and just shut ...
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1answer
426 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
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0answers
11 views

Requirements Placed on a User of a FIPS 140-2 Validated System

Per customer requirements, I am working with a FIPS 140-2 validated network switch that is actually running in FIPS mode. This guarantees that any cryptographic operations the device performs will be ...
9
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3answers
533 views

Can an attacker “simulate” a private IP address?

I have a SSH server with a rule that does not allow password connections outside the local network. So people already on the local network, either physically or via VPN, are allowed to connect with ...
5
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4answers
440 views

Bad password policy at my bank

I logged in to my bank tonight and was prompted that all customers were being forced to change their passwords for "security reasons". The policy for new passwords is: 6 to 10 characters, no special ...
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0answers
63 views

Password-less authentication using corporate Active Directory on external (internet) site [migrated]

I need to restrict access to an external site so that: users who are in the corporate network have full access to the site's functionality, those who are not - only limited functionality. In the ...
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1answer
87 views

Security protocol for NFC stickers/cards

Lets say I'm using NFC cards for access control. NFC cards/stickers are easily readable and writable, so my worry is that the data on them could easily be cloned onto another card/sticker and bypass ...
1
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1answer
69 views

Why should I include a client_id in an OAUTHv2 password grant request?

Like little red riding hood, you don't know who is knocking on the door... Why even bother accepting a client_id in case of a API <-> Javascript-website or API <-> Android App password grant ...
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1answer
857 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 ...
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2answers
32 views

Public/private key auth and VPN

If a server uses public/private key authentication to access SSH, will there be any advantage of restricting the access of SSH over VPN? This link describes both approaches to solve brute force ...
24
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2answers
1k views

What attacks, if any, are possible against Security Support Provider Interface (SSPI)?

I've been looking at SSPI recently, as it is used for authentication in a variety of Microsoft products. From the looks of it, it's based on GSSAPI and provides an abstraction for wrapping various ...
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1answer
21 views

RADIUS use outside of network AAA

I've seen RADIUS used for wireless authentication, but are there any other use cases that RADIUS works well in? Has anyone had experience with using RADIUS for AAA between two applications? I'm ...
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2answers
68 views

ASP.NET session id strength

After reading this and this, I am wondering if it is considered secure to use the default ASP.NET sessionID as a means to authenticate the user. I know it would be better to implement ASP.Identity, ...
4
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7answers
261 views

Should user IDs be implemented in online banking?

How common is it for a bank to request you to make a user ID as well as password when banking? Should they simply use a pre-determined number such as your credit-card, or are there advantages to have ...
1
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1answer
166 views

Why AJAX is not used to log in?

I'm wondering why AJAX is not used to log in nor register in most of the pages and it's used PHP reloading the whole page. Is it about security, or it's just that it's not practical at all?
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1answer
575 views

Forcing EAP-TLS 1.2 authentication with FreeRadius and OpenSSL

Been working with TLS DHECE certificate based handshake with a FreeRADIUS server and WPA_supplicant - both running OpenSSL 1.0.1j FIPS. Afer watching the Wireshark traffic, I notice that the client ...
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1answer
39 views

vpn and strong authentication, how does the two work as a pair?

Dont know. maybe I was to unprecise.... I basically am asking if a SSL-VPN solution is solving both the encryption and the authentication, like that the user authenticates himself to the vpn-client ...
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5answers
13k views

WiFi deauth attack - Difference between Aireplay and MDK3

I am currently working on some WiFi related security issues, and something appeared to me. I have an Open WiFi network, to which a client connects. I try the Deauth attack from Aireplay ...
2
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2answers
214 views

Using OAuth 2.0 without token storage

I am building a system for a product which requires Authentication and Authorization. Naturally I have chosen using OAuth 2.0 as it is a commonly used protocol and has proven to be useful. I am ...
2
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2answers
76 views

Openssl ciphers: what does Au=ECDH mean?

I am trying to get a grasp on different stages of SSL. I have referred to some fantastic answers about how SSL/TLS works and specifically about authentication mechanisms, and numerous other sources. ...
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1answer
24 views

Signup/Signin with Mobile+PIN

Telegram implements signup/signin with mobile number and a 5-digit one-time password. I believe the flow to be something along the lines of this: Grab the mobile number, generate an OTP, cache it ...
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2answers
93 views

Ways to secure administrative pages of a portable site

I made a CMS (using PHP) that is basically drag and drop to be live (under linux/apache hosts), now I need the communications between the administrative/login pages of said CMS and the client (recent ...
3
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1answer
193 views

Session Management for Private Key Passphrases in a Web Application

Use Case I would like to encrypt data in a database for a Web Application. The following requirements exist: Decryption should only be possible when a user provides a passphrase Encryption should ...
1
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1answer
80 views

Check HMAC after completing decryption or before?

I have written a piece of software that symmetrically encrypts big files (multi-megabyte). Plaintext is encrypted, after the encryption the HMAC is calculated and written into the header of the file. ...
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0answers
40 views

Time Based Authentication

I need a way of authenticating that a file was generated by a particular machine that has a unique ID and a unique random secret also known to the authenticator, as an added difficulty the file ...
3
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1answer
357 views

Security Implications of Google's Two Step Authentication’s Backup Codes

Sometimes, when I log in to Google, it asks me to print out some backup codes for the two step verification process. This seems like a big back door that breaks the whole point of two step ...
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1answer
279 views

How to build a secure stateless authentication system for a client-side JavaScript application

i'm building a stateless authentication system for a Dart application (Dart gets compiled to JavaScript, so the whole application is an index.html file which loads JavaScript and runs in the browser) ...
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1answer
51 views

Can a 0800 and 00800 be from different companies in UK [closed]

I recently received a call from a 00800 number, that seemed like a prerecorded message asking me to press some keys to continue. I disconnected. I later googled the number and I noticed that a ...
0
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0answers
15 views

At OpenSSH ssh server side key files has 0 data. I would like to know the reason for it

I am using the Monta Vista Linux. In this recently i have observed the ssh keys files has 0 data due to which the keys were not generating and i am not able to login to machine via ssh because of key ...
2
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1answer
212 views

How secure is a password app that stores both the password and two factor secret in one place?

Take for example 1Password, that now can store your password and one time password secret in a single place (your 1Password vault). I know it isn't truly two-factor anymore, but how much better is it ...
0
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2answers
137 views

Why do I have to use multiple Keys for each direction and purpose?

I'm currently writing an examen about 'Lessons Learned in the IT-Security'. I already found some thing, which shouldn't be done. But right now I'm in trouble finding the reasons why not to do so. ...
2
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2answers
304 views

How does a user get authorized wihtout authentication

I have a back-end (API) and a front-end, eg a web server, and I have users and ID-providers. The web server is provided by a third aprty and it may just as well be a mobile app, but whatever the case ...
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1answer
155 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
68 views

Multiple logins on the same website

If a hacker uses MITM in an open WiFi network, he can easily grab plaintext passwords so that he can login from his PC and change it. Is there any solution for this? I wonder when we log in to ...
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1answer
350 views

secure use of psexec?

As of March 7, 2014 PsExec now "encrypts all communication between local and remote systems, including the transmission of command information such as the user name and password under which the remote ...
0
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2answers
90 views

Should I create one key pair per customer as Service Provider in SAML?

This is more or less the reverse of what's asked in this question. I recently added SSO with SAML to a SaaS Web application making said application the Service Provider (SP). This is done so ...
3
votes
2answers
2k views

Session Authentication vs Token Authentication

I am trying to get a handle on some terms and mechanisms and find out how they relate to each other or how they overlap. Authenticating a theoretical web application and mobile application is the ...
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2answers
72 views

Is it Safe to Send an Invalid Password Back to the Client?

It is common for websites to remember the username input value after an invalid login attempt but not the password input value. Take SE for instance. When I attempt to login with an invalid password: ...
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1answer
37 views

SSL cert vs public-key authentication

If SSL/TLS uses a pre-created certificate why does it also use public-key ciphers such as RSA and ECDSA for authentication (I do not mean MAC integrity)? Are they related?
2
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1answer
108 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 ...
1
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2answers
82 views

SSL/TLS client authentication - practical client cert validation

How do real HTTPS servers validate client certificates? My context is business-to-business rather than regular human clients. I understand basic chain validation to a trusted root CA cert. But do ...
1
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1answer
42 views

Should I show the security answer when the user goes back to edit the field?

So when a user signs up to create an account, they are required to select select questions and enter security answers. Once they do that, they can proceed forward to a review page that shows them the ...
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1answer
77 views

Is this process a secure way for users to login? If so, is there a name for it already?

I thought of this process specifically to stop "man in the middle" attacks and replay attacks: User types their username into the client application. Client application sends the username to the ...
2
votes
1answer
32 views

Saving Authentication Tokens to Third-Party Websites

So Flickr allows you to authenticate users to your app via app_key and secret and returns an authentication token. I want to securely save that authentication token in my database, but also be able to ...
2
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0answers
36 views

Using RSA-SHA as/instead HMAC in OpenVPN?

While reading the manual of OpenVPN 2.3, I came across the --auth alg option. The manual says: Authenticate packets with HMAC using message digest algorithm alg. (The default is SHA1 ). HMAC is a ...
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3answers
1k views

Client Authentication by certificates in Google APP Engine java

I am writing an application in Google APP Engine java which authenticate the user by its certificate. I have created a self signed certificate using keytool at client side. I also enable the HTTPS ...
2
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1answer
132 views

Is it a safe to hardcode my secret key in my iOS app?

Cloudinary iOS SDK configuration suggests to hardcode your api_secret in your iOS app's source code. Isn't that a security vulnerability since string literals can be extracted from the app binary, ...