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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Bluetooth LE 4.0 security issues [duplicate]

How does BLE secure communications between devices? BLE 4.0 supports AES128, and the key exchange is done using DH. However, it is often reported that BLE 4.0 has security issues. What specifically ...
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1answer
67 views

WebCrypto, SOP and Yubikeys

I've been following some discussions on WebApp Security mailing list regarding WebCrypto and SOP policies (100+ messages). One of the things that kind of sprang out was keys held in WebCrypto were not ...
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3answers
327 views

What advantage does the Bloomberg authentication system have over traditional 2 factor?

Bloomberg clients have an interesting way to authenticate to the server. This seems involve some of the following: Logging into a secure website, that displays a flashing square Swiping your finger ...
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3answers
452 views

Message Authentication Codes (MACs)

What is the main difference between Message Authentication Codes (MACs) and hash function? Is there any difference regarding their usage domains?
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2answers
452 views

Storing Seed for TOTP

We have a public website for employees which has access to some sensitive company information. To make the login process more secure we want to implement TOTP. The setup and implementation has been ...
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0answers
73 views

What are the formal methods to analyze Authentication Protocol

I designed an authentication protocol for consumer-producer applications, which barrows features from Kerberos and Tesla. To check the strength of protocol I considered different well known attacks ...
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5answers
7k 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 ...
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5answers
6k views

Is there a reason to protect SIM with PIN?

If the phone would be stolen then the SIM card will be thrown out by thieves just after the theft so that they can't be found. If the phone would be lost then it will be harder to find an owner for ...
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8answers
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On two-step login forms, why is it the login name and not the password that's asked first?

There are several login forms (e.g. Google's) on the internet where you first enter your login name and then, once that's submitted, you get to enter your password. One of the advantages of this is, ...
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3answers
231 views

Can OAuth2 help to authenticate the app?

We have a mobile app that communicates with our server via a RESTful HTTPS API. We also have an attacker pretending to be our app while attempting to communicate with our web services API. We assume ...
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2answers
183 views

Questions about user authentication over REST API

I'm now trying to implement user authentication on my android app. I, however, have a few questions. I use a REST API. How do I safely request and send data to and from the phone? I'm assuming that I ...
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1answer
223 views

Authentication SSO token security - SAML, OpenID Connect

I am trying to understand how works various SSO technologies like SAML 2.0, OpenID Connect 1.0. In general, they work in a similar way providing tokens (XML, JSON) through Identity Provider to ...
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0answers
86 views

Zero Knowledge Proof Password Systems

I am wondering if there is a practical zero-knowledge proof system that can be used by humans to authenticate themselves to a server. Note that even the computer can not be trusted (at least with the ...
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1answer
78 views

How dangerous is reflected request query strings?

I have discovered a possible security flaw in a login for a site that many people rely on. I won't say the site but in the URL there is something similar to /Success?message=Success+please+wait+a+bit+...
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1answer
66 views

Authenticating users by checking if the key can decrypt a phrase vs by checking a password against a database [duplicate]

I'm kind of curious: Why would we store a password in a database when we can just encrypt a phrase such as "unlock me" using that password and then, at login, seeing if the encrypted phrase can be ...
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0answers
29 views

Verify which file a request to the server originated from

In order to make my question clear I will give a practical scenario. Lets say I have a server where I allow people to upload a script and allot them part of my drive, the script can make requests to ...
2
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2answers
109 views

How can Authenticity be achieved in SMS or Text Messaging?

What tools or information is needed to verify the authenticity of a SMS message... or to send one so that such authenticity is intact? This answer describes something as a "message center", but I'm ...
3
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1answer
6k views

How client certificate works for authentication (in Web API)

I have been working on this scenario for a week. I have implemented the code to authenticate client certificate using this link: http://www.asp.net/web-api/overview/security/working-with-ssl-in-web-...
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1answer
96 views

What are the security implications of having login dialog inside of an iframe

I have the page to render some content and I allow it to be embedded at any third party page, so I can't use X-Frame-Options. One of the requirements is to ask user for login/password when content ...
2
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0answers
214 views

Astonishing Recent Belkin Router Auth Bypass Vulnerability: CSRF Used to Exploit?

I was visiting the CERT site main page today for another reason when I glanced at the list of recent vulnerability bulletins and came across some news I had somehow missed before today: a notice that ...
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2answers
58 views

Can a Meta Tag be Spoofed? (Is a Metatag Sufficient to Declare a Page is Protected?)

Background I am working as a front-end developer, and I have very little security experience. We are working with a very obscure backend setup, using a 4D database and WebClerk on top of it. ...
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1answer
243 views

Information Security Thesis idea [closed]

I need advice. Currently I'm doing my Masters in Information Assurance, and I only have my Thesis left to graduate. I chose a topic for my thesis but for some reason I don't feel confident that it's ...
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2answers
1k views

Decoding tunnel bytes in EAP-TLS or EAP-TTLS using Wireshark

I have a few pcaps of traffic for EAP-TTLS conversation, carried by RADIUS. I also have some being carried by EAPoL, but I think the answer to that case might be even less straightforward (though ...
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1answer
155 views

cryptographic session token vs stored random session token [duplicate]

I am building a web API and I have a hard time choosing between cryptographic session token and stored random session token for user authentication. I see several pros & cons for each: stored ...
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3answers
3k views

Determining the accuracy of a biometric system

How is the accuracy of a biometric security system (its ability to minimize false acceptance rate and false rejection rate) determined?
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3answers
2k views

BCrypt's 72-character limit and using it as a general digest algorithm

Goal: have token/cookie-based authentication that doesn't require keeping sessions on the server TL;DR: What, if any, is the accepted mechanism to work around the 72-character limitation of BCrypt? ...
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2answers
3k views

Risks of having SSH private key stolen

I'm afraid this is quite a common question, but searching several times through the questions did not prove useful, and I'm really eager of knowledge here :D I understand that keeping SSH private key ...
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0answers
84 views

Is authentication/authorisation necessary between a web server and an isolated application server?

If I have a system that consists of an application server which responds to requests made only from the web server. a web server that responds to client requests over the internet. Is it necessary ...
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3answers
2k views

Strategy for updating stored passwords to more secure hash? [duplicate]

I know that we cannot update our hashed passwords without having the plain text password to re-hash. When a member logs in with login/password, we have the plain text, so that gives us an opportunity ...
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1answer
2k views

How can a system verify an online password using a phone keypad?

I phoned into a financial company's website, and it prompted me to key in my password on the phone keypad, converting the alphabetic characters to the corresponding digit, and special symbols to '*'. ...
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2answers
228 views

Difference between KMS and PKI

While the PKI System deal with digital certificates life cycle and Key Management System (KMS) deal with keys life cycle. What is the the fundamental difference between them? Is it possible to ...
16
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4answers
365 views

Are malicious relying parties able to abuse OpenID logins?

if I logon with OpenID into a website (crafted by attackers/hackers) I want to know how much damage can they do to me? Are they able to steal my contact info, name, etc (assuming I'm using Gmail ...
3
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1answer
172 views

OAuth2 Client Credentials & Native Apps

The OAuth2 spec seems to consider native (Android & iOS) apps as "public clients", ultimately meaning that they can't use the "client credentials" flow. That being said, how does one go about ...
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215 views

SimpleWebRTC Server Side Authentication for Room Access

I am trying to do some sort of server side authentication to allow only specific clients to join a SimpleWebRTC Room. Right now, any client that goes to the SimpleWebRTC "demo" page can join the room....
335
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8answers
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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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1answer
88 views

The difference between authentication protocols and authentications rules

ISO 25023 divides the authenticity into authentication protocols and establishment of authentication rules. I understand that the authentication protocols aim to authenticate the user using different ...
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0answers
74 views

How to secure a service with Mutual SSL Authentication and Intermediary CA?

Given: A working SSL mutual authentication setup (a WCF service hosted in IIS) No Intermediary CA In the current setup any client in the world having a certificate signed be one of the well known ...
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6answers
401 views

Authorization before Authentication?

From a conceptual point of view, can authorization occurs without authentication taking place first? I'm thinking about few cases where authorization seems to occur without authentication taking place ...
6
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1answer
543 views

Deal with number changes in a phone number based authentication/login system

Twitter Digits (https://get.fabric.io/digits) provides an authentication/login system based on phone numbers for mobile apps, and several other mobile apps (e.g. Square Cash, https://squareup.com/help/...
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5answers
3k views

What is the difference between login throttling and temporary account lockout?

I am currently working on the redesign of a login page. I have initially suggested that login be throttled whereby pauses (incremental - in number of seconds) are introduced between each failed login ...
11
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5answers
2k views

Are case-insensitive passwords a bad idea?

I recently discovered a service where the password was not case sensitive. I understand basic principles of encryption and hashing so I am a bit worried, is this service storing my password in plain ...
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1answer
1k views

Best way to deal with cross-domain authentication in intranet

Firstly, I'm not sure if this is valid board to ask this question - maybe it should be asked on StackOverflow? Overview on use-case, what we trying to achieve: Two servers, on two different domains; ...
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1answer
106 views

What happens when authenticating through a phishing attack with FIDO U2F tokens

So I have looked around and haven't found this anywhere. What happens when the response server is a phishing site with FIDO U2F tokens? Basically, if login just fails, I would assume that the user ...
0
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1answer
92 views

Google account 2FA only with HW security key?

Is it possible to configure 2FA access to a Google account using only HW security key (e.g. Yubikey) without verification SMS code option ? It seems that SMS confirmation code is still primary 2FA ...
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1answer
74 views

How does a public key authenticator work? (as opposed to public key signatures)

In the documentation for djbs library NaCl under the headline Security model you can read that the library provides public key authentication without non-repudiability (http://nacl.cr.yp.to/box.html). ...
12
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1answer
158 views

How can mobile sign-on be secured from imposter authentication screens?

History seems to have come almost full circle where old issues are shown in new/emerging technologies. Background If you trust the operating system, Windows originally had the Control - Alt - Delete ...
3
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1answer
157 views

How can storing a userId as client-side-sessions be safe?

The documentation for session handling in ninjaFramework states: [...] Ninja uses so called client-side sessions. The cookie itself stores the information you want to attach to that session. [....
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3answers
846 views

Securing REST API with HMAC and basic auth

I was wondering if giving users choice of a method for securing their access to API would be a good idea. Background: We are creating and deploying applications for our customers, which help them do ...
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7answers
2k views

Taking password letters not whole one, is this secure? [duplicate]

I found a site which is taking password letters from their users not the whole password. Is this secure? Or do they have saved password as salted hash (MD5)?
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1answer
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Authentication on remote, unmanned, unconnected machines/devices

What proven methods exist for authentication of a user on remote, unconnected machines/devices where establishing unique login credentials for the users isn't practical due to the number of machines/...