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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Authentication and Authorization for a simple Web Site [migrated]

I'm struggling with these concepts and having trouble finding good resources on the web. We are looking for ways to switch out custom implementations tightly integrated into our application for ...
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1answer
18 views

Pre-Requisites for Mutual Authentication

For Mutual Authentication, the client must contain the CA certificate of the Server and his own Certificates, and the server must contain the CA certificate of the Client and his own Certificates.In ...
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2answers
90 views

Obscure username input on login forms?

Not (necessarily) a duplicate of: Should both user ID and Password be masked for online banking? Definitely not a duplicate of: Should usernames be kept secret? I can sense your finger on the "mark ...
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2answers
63 views

Is CAPTCHA necessary when I use token?

I wonder is it a good idea using captcha when using token on login page? I think it's impossible for robots to mess with login page because token changes on every request. Thanks.
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6answers
10k views

Could SQRL really be as secure as they say?

I just came across https://www.grc.com/sqrl/sqrl.htm With Secure QR Login, your phone snaps the QR code displayed on a website's login page . . . . and YOU are securely logged in. This ...
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0answers
14 views

Combining Hash Visualisation (VisualHostKey) and SiteKey to prevent MITM

TL;DR Skip to the No SiteKey + Plugin if you don't want to read this whole thing. VisualHostKey shows an SSH hash like this: # Host github.com found: line 53 type RSA 2048 ...
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1answer
17 views

Purpose of Initialization Vector in File Encryption and Authentication (FEA)?

I came across this schematic of FEA implementation using RSA and AES: Suppose that PKB is Bob's public key, PKA is Alice's public key, SKB is Bob's private key, SKA is Alice's private key, Ks is the ...
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1answer
150 views

How can I handle user authentication and sessions in my app?

I'm currently building an authentication module and I've got a question. I have set up a server with an API and want my users to authenticate to this server, but I use AngularJS for the site. ...
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3answers
7k views

What are the dangers of allowing “less secure apps” to access my Google account?

According to https://support.google.com/accounts/answer/6010255: Google may block sign in attempts from some apps or devices that do not use modern security standards. Since these apps and devices ...
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1answer
95 views

Client authentication with a collection of open source distributed servers

With a collection of open source distributed servers, all sharing every users data. How can the user authenticate with any server, without the passwords being compromised by a malicious server? ...
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2answers
72 views

Does the secure attention key really increase security?

Are there any statistics on whether requiring the secure attention key to be pressed on login actually increases security ? I personally don't see the point of that : if you're after credentials, ...
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3answers
135 views

Is it okay to only use username/password to secure an admin page for moderating a website?

Is there a standard practice to securing an admin page for an application written in angular and nodejs or just in general? The admin page would approve/ban users and moderate comments. Should it be ...
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3answers
10k views

How secure is Android's facial recognition?

Android supports using facial recognition for unlocking your phone. How secure is that mechanism? For instance, if someone has a good quality picture of your face, can they defeat the facial ...
2
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2answers
214 views

Temporarily save failed logins password hashes for using against brute force attack

My question is about online brute force attacks, that try to authenticate in the website. 1) For the first case if the requests are coming from the same ip, I think this are relatively easy as after ...
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1answer
69 views

Different password for each login - based on some variable

This might sound a silly question, but I was thinking this as and extra option(which is not required) mainly for advanced users, who want to protect their accounts even more. Lets consider that other ...
232
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7answers
177k views

RSA vs. DSA for SSH authentication keys

When generating SSH authentication keys on a Unix/Linux system with ssh-keygen, you're given the choice of creating a RSA or DSA key pair (using -t type). What is the difference between RSA and DSA ...
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0answers
20 views

Unable to authenticate with Client cert in TLS1.0 [migrated]

I have my own application running in Windows machine (server). I am using a browser as a client to do operations. I have multiple users connecting to the server using client certificates as the ...
3
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1answer
98 views

How can I successfully perform an xss attack on a dummy website? [closed]

in my security course, we were told to practice an xss attack using firefox on this website; http://permalink.co/ No worries, this is a website specifically setup for us to practice ...
3
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2answers
102 views

Is there any point in using two step authentication if you have strong passwords?

If you are in the habit of using strong passwords (randomly generated by password manager) is there any point in using two step authentication? Assuming that 99% of the time that when you enter a ...
2
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1answer
361 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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3answers
702 views

PCI DSS 2.0 and ssh keys

I know the real answer to the auditor. We are a smaller company under 40 total employees that is also PCI level 1 compliant. We've always used ssh keys on internal servers. You can't ssh in from the ...
3
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2answers
63 views

Why would you decouple your resource and login servers?

As described on this link, OAuth specifies that a login server and a resource server should be decoupled. The idea is that if one of your resource servers gets hacked, no password data is lost. All ...
3
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1answer
83 views

Smart lock protocol

I made an Arduino project to lock and unlock my door via my phone (with Bluetooth). It works well but it’s unsafe since I just send the lock and unlock command in cleartext, without authentication or ...
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1answer
43 views

MD5 before PBKDF2 on legacy software

I am mantaining a legacy software that uses MD5 in the following way: The client asks for a 16 byte salt when authenticating an account. The server generates a 16 byte salt, links it to the account ...
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0answers
14 views

Is OpenID Connect (OAuth2) appropriate for standard login + social login + single sign on? [migrated]

I have to implement authentication in a group of websites. The solution will have to support standard login (user & password), social login (facebook, google+, twitter) and single sign on (once ...
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1answer
59 views

Security tradeoffs while designing a mobile Web Service API

I'm not a security expert but I want to ask about tradeoffs in a web service API I'm designing for mobile apps. It is an API which tracks users' locations so yes, the data is reasonably sensitive. ...
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3answers
1k views

Login required before SQLmap

I have a multipart form data where I am suspecting one of the multipart form fields (parameter named htmlbevt_id), to be vulnerable to SQLi. To test for the same I captured the request using Burp and ...
22
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4answers
7k views

How secure is Windows 8's Picture Password login?

The final Windows 8 build has been released to manufacturing. One of the new features of Windows 8 is "Picture Password", where the end user logs on to Windows by clicking a specific pattern on the ...
99
votes
8answers
39k views

Is BASIC-Auth secure if done over HTTPS?

I'm making a REST-API and it's straight forward to do BASIC auth login. Then let HTTPS secure the connection so the password is protected when the api is used. Can this be considered secure?
3
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2answers
158 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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0answers
17 views

Difference between Kerberos and GDOI?

What is the difference between Kerberos and GDOI, I know first is more toward authentication and latter is more toward multicast key management, can I use Kerberose protocol in GDOI for server and ...
0
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1answer
117 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 ...
1
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1answer
299 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 ...
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1answer
91 views

Risk of keeping OAuth2 client_secret in application

As an exercise, I'm developing a desktop application with which users need to log in to a web service. A logical use-case for OAuth2 one would say, but I'm beginning to doubt its usefulness. I am ...
21
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1answer
941 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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0answers
14 views

Difference between Kerberos and GDOI

What is the difference between Kerberos and GDOI, I know first is more toward authentication and latter is more toward multicast key management, can I use Kerberose protocol in GDOI for server and ...
1
vote
1answer
29 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
616 views

Untrusted connection visiting https://www.opensource.apple.com/

Somebody on Stackoverflow posted some code from https://www.opensource.apple.com/ When I click this link in Firefox (36.0) it says "This Connection is Untrusted". But other people on that thread on ...
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1answer
618 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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1answer
192 views

Is this a good approach to secure my REST API?

My application consists of a nodejs back end API but I am also developing a "reference" implementation of a JavaScript client, which is a backbone SPA. First of all; the API accepts only HTTPS ...
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1answer
72 views

SSO software – where is symmetric key stored?

In SSO software (Oracle E-SSO …), I heard about (primary) key encrypting user’s credentials, but I can’t read anything about how this key is managed ? When using smartcard, I can understand that ...
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0answers
8 views

Tomcat client certificate authentication, client certificate not sent [migrated]

I've add client certificate based authentication on our Tomcat servers. Both client and server are tomcat servers with internal CA issued certificates. Each tomcat has its own keystore (PKCS12) ...
4
votes
3answers
2k 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 ...
34
votes
7answers
7k views

Why isn't open WiFi encrypted?

As far as I understand, WiFi networks that require no password send traffic through the air unencrypted. Those that require a password encrypt each connection uniquely, even if they're all using the ...
9
votes
2answers
881 views

How does Google detect new devices for two factor authentication

When you enable two step verification for google accounts, you get sent a code by SMS to enter in addition to your username and password the first time you log in with a new device. How do they ...
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1answer
68 views

Limiting Login Attempts [duplicate]

I have to set up a server that will allow remote logins. Obviously security is an issue. In this first pass we are discussing:- Locking a person for 15 minutes if they fail to login correctly three ...
1
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0answers
28 views

Spring-MVC : Encryption/Decryption with user password [migrated]

I am working on a Spring-MVC application which uses Hibernate as the ORM and PostgreSQL as the database, in which I am looking for on-the-fly encryption decryption solution, but only for 2 columns in ...
0
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1answer
59 views

Why first kerberos message is not ciphered

When analysing Kerberos exchange (and other similars as Needham, Denning, etc.) I wonder why the first message where the identities of the client and remote are not encrypted. In case not encrypted I ...
3
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1answer
852 views

OAuth2 with client credentials v/s other auth mechanisms

For a REST API against which clients would be writing non-browser based, non-interactive applications, if OAuth2 is the authentication mechanism to be followed, then we would use the client ...
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1answer
91 views

OTP for syncing mobile device

Scenario: a web app with two-factor authentication using username/password and hardware OTP. Once logged into the app, one of the app modules should be used in a tablet or any mobile device without a ...