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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154 views

What rules should be enforced for users to create a strong password?

I'm looking for a definitive guide to the rules that determine a "strong" password for website authentication. It seems many websites have many different rules, and I'm not sure what is the best ...
1
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1answer
252 views

How can I allow local pop3 but enforce remote pop3s on my ubuntu/postfix/dovecot OS/MTA/MDA

I would like to allow local clients to access email via any of pop3, pop3s, imap, or imaps if they so choose but restrict remote clients to pop3s and imaps only, simililarly to how I already do for ...
6
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3answers
257 views

What is the value in asking for a second password for sensitive operations?

When a user has logged in to a system using their primary password, is there any value in asking for a distinct second password when performing sensitive functions? Does it provide any benefit over ...
5
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1answer
3k views

Facebook page receiving improbable amount of likes from unknown users

A bit of an odd problem, but I'm not totally sure where to post this. I am an administrator for a facebook page that suddenly began receiving hundreds of likes in the past few days. This trend began ...
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1answer
410 views

What is the origin of the three factors of authentication?

The three factors of authentication - something you have, something you know, something you are - are ubiquitous in security literature, but I have yet to find a reference to the origin of the ...
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3answers
2k views

What do I need to do to secure log-in and registration for my website?

What security features do I need to have in-place to ensure that my website log-in and registration forms are secure?
2
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1answer
418 views

When checking a session variable to see if a user is logged in, is it enough to check to see if the variable is set?

When displaying a page with content only logged in users should see, I simply check if(isset($_SESSION['hasLoggedIn'])) { //show content } else { echo 'you must log in'; } In this article it ...
5
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5answers
473 views

Should an invalid user name be logged?

While authenticating, should attempts with invalid user names be logged? OWASP Logging Cheat Sheet says that authentication failures must always be logged. I can observe several programs doing this, ...
2
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2answers
411 views

Looking for general guidance on securing web API application for client applications and users

I have a web service built with WebAPI that accepts JSON requests and responds accordingly. The core architecture is built but there isn't any authentication/authorization. After a lot of googling ...
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2answers
378 views

Client authentication vs. user authentication

I am currently looking into authentication protocols which work well with REST API, in java. There is something fundamental I don't understand: I read a lot of material about OAuth protocol, SSL, ...
4
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1answer
2k views

Drawbacks of storing an authentication token on the client side?

I am working on an ASP.NET MVC web application, which fetches its data from an API in the back. So authentication is currently done via ASP.NET Forms Authentication, which means the client sends email ...
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2answers
238 views

Preventing Voter Fraud on a Social Media Contest

I'm creating a contest that will allow users to login using their Facebook & Twitter accounts and submit votes on videos. My clients concern is that users will game the system by logging into ...
4
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3answers
206 views

jasypt message integrity

I've been looking into ways to encrypt an authentication token that I need to pass from one site to another. Things i have learned so far are use a high level library. don't use ECB use a HMAC to ...
3
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2answers
88 views

Can a good SSO protocol be built around a server signing tickets rather than validating them on demand?

CAS and its alternatives all seem to require a flow like this when one service is acting as a proxy for a user when accessing a back-end service: Service A makes a request to Service B on behalf of a ...
4
votes
1answer
819 views

How secure is Integrated Windows Authentication for IIS SMTP?

I have a Windows SMTP server that is currently allowing the "AUTH LOGIN" method of authenticating. As I now know, this is simply a base-64 encoding of the username and password, which is basically as ...
0
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2answers
688 views

How to completely password protect login into Ubuntu 12.10?

I am running Ubuntu 12.10 on my laptop and I would like to make a set up such that without a login password, no one would be able to login into my system. Currently it seems that one can, quite ...
3
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2answers
367 views

Is Yahoo SignIn Seal effective at phishing prevention? [duplicate]

Possible Duplicate: Effectiveness of Security Images Information about the efficacy of Yahoo's SignIn Seal is scarce, the best I could find was this section on Wikipedia's entry on ...
6
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4answers
472 views

Banking application login leaks information

My question is regarding the online banking application of a large credit card organisation. The login process for this application works as follows: User visits the homepage of the bank. User ...
26
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3answers
814 views

What is this authentication method/approach called?

Background: I want to implement something like this in our websites, and I'm looking for advice and possibly APIs that allow this out of the box rather than re-inventing the wheel, but I can't even ...
1
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1answer
501 views

Browser cache, cookies, active logins and other data

This question is regarding common browsers, even though I may refer to Firefox settings. Not IE though, I wouldn't expect that to be in any way secure. I'm seeking to know how secure it is to let the ...
7
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1answer
1k views

What possible use does an iFrame have for security?

I'm looking at code for an old login form I'm redesigning. It's a simple table with two input fields for username and password. But just before the end </table> tag there's a blank iFrame which ...
1
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1answer
98 views

Java applet authenticity problem

I implemented an applet in java to authenticate users at my website by the usage of MIFARE cards and everything is working good. However I am concerned about the applet's authenticity, in other words, ...
3
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1answer
6k views

Setting up Windows laptops to require a smartcard for unlocking

I am looking for details on how to secure a windows laptop using smart cards. The scenario is that we have laptops in vehicles, which remotely connect (via https) to an application server over the ...
3
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4answers
2k views

Why do APIs use API Keys instead of Usernames?

It is now common to use an API Key to identify an agent when dealing with an API. What are the merits of doing that over using a username specified by the developer? Is it simply that the API Key is ...
3
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2answers
9k views

How to use OAuth with Active Directory

I'm creating a REST WCF service and want to use OAuth to authenticate each user's request. The user accounts are stored in Active Directory so I have access to their AD login name on the client ...
4
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1answer
1k views

Comparing the standard HTML form POST for user authentication vs Javascript/AJAX

Are there any security implications with POSTing a authentication request with the use of javascript/ajax, as opposed to POSTing an HTML element by pressing the submit button? thus <form ...
2
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1answer
790 views

Web service HMAC authentication/anti-replay

I am creating a web service, which handles various requests from web clients. The client and server share a big secret key S, and when one part wants to send data, it calculates the token as follows: ...
5
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2answers
621 views

Email instead of username

I am wondering about the security implications of using email as the main identifier via which a user logs in (with an associated password, of course). Can I treat it as I would a normal username or ...
4
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2answers
449 views

user authentication by decrypting a random blob

Normal user authentication is done by comparing "hash"-values. A simple example of this: The user password is hashed with PBKDF2 on the client using a salt (the salt is the hash of the user password ...
3
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4answers
631 views

FireFox's restore previous session restores logins authenticated by server's sessions

In a website I'm building when I login, close FireFox, open FireFox and try to go to the website again I must login again (as expected) BUT if I select "Restore Previous Session" I am logged in again. ...
3
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3answers
1k views

How to use USB-Stick instead of passphrase?

I wanted to know if something exists that would allow the following. Whenever I use my RSA key(when using ssh for example) I'm prompted for my passphrase. I would like to, instead of being prompted ...
0
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2answers
186 views

Where are the private keys stored in Persona/Browser ID?

I'm trying to understand where the private keys are stored in the Persona system, and how they are protected. Can anyone elaborate on where the crypto material is created, stored, and what is ...
7
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4answers
989 views

Why does getting a password wrong takes more time than not

I type my password to login to Win or Linux. Case 1: I get it right. Almost instant reaction. Case 2: I misspelled it. It takes a while, and then rebounds. Why does it takes longer to identify a ...
7
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5answers
316 views

How to support secure creation of a user account over an external API via a queued job?

So this question is delving into security and encryption and the problem potentially hasn't been encountered by many. Answers may be theoretical. Let me outline the scenario... A website frontend is ...
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2answers
208 views

How to guarantee counter synchronisation between client and server for counter in hmac-based one time password implementation?

This is a clone of a question I posted on Stack Exchange. Thought I might catch the eye of some different people who could help here. We are trying to implement a hmac-based one time password ...
6
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2answers
2k views

How can I prevent people from duplicating my barcodes [duplicate]

I would like to manage my inventory using a barcode system, but I am afraid that people will be able to scan or copy my barcode and make duplicates. I would like to offer a discount card that has a ...
33
votes
4answers
4k views

Should I change the default SSH port on linux servers?

Is there any advantage in changing the SSH port, I've seen people do that, but I can't seem to find the reason why. If you have a strong password and/or a certificate, is it useful for anything? ...
3
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2answers
502 views

Is there a reliable way to simulate “Evil Maid Attack” boot path tampering when using bitlocker?

Suppose you have a system whose OS drive is encrypted with bitlocker and uses TPM + PIN authentication to authenticate the boot path against tampering. As I understand it, this setup theoretically ...
0
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2answers
141 views

Senario:SSL Enabled Online Banking Application. Question: Should card numbers be provided back to a user un-masked, when there is a failed login?

For an online banking application with SSL enabled, should card numbers be provided back to the user unmasked, when there is a failed login. Would this be a violation of PCI DSS 3.3 or not as the ...
4
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2answers
489 views

How can the low-water mark property apply to Bell-LaPadula?

I am taking a computer security class, and have a homework problem which has the following setup: Now assume a dynamic version of the Bell-La Padula Confidentiality model that incorporates a ...
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0answers
47 views

Can double encryption with different key increase the security? [duplicate]

Encrypting the file using same encryption algorithm using different Keys can increase the security or not?
0
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1answer
140 views

Is this a secure method for authenticating clients?

I am working with several other people in writing software which requires authentication before it accesses resources. In order to authenticate, we devised the following strategy. Client sends a ...
1
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1answer
4k views

Web Applications (http): Don't get how token based authentication is secure

See something like this: http://stackoverflow.com/questions/10826293/restful-authentication-via-spring/10864088#comment21706215_10864088 Or more specific: Token-based authentication - Securing the ...
11
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3answers
754 views

How much information about the reason for an unsuccessful login should a web application give?

After an unsuccessful login attempt, should I inform the user about its reason? Or more generally, how much information about the reason for an unsuccessful login attempt should a web application ...
2
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2answers
340 views

MySQL Access Control?

I have read somewhere that it is better to have two different MySQL logins in order to prevent hacking. What I mean is having one MySQL login for read access (SELECT permission) and another login for ...
2
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4answers
370 views

When logging out of a website is anything else required then destroying the session?

In PHP, I'm not sure if I should start the session before destroying it when a user wants to log out. session_start(); session_destroy(); Is there anything else that needs to be done? EDIT: I ...
5
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1answer
176 views

Security and authentication problem

We have a sample scenario and we would like to receive some feedback and some solutions regarding possible security schemes. First of all, lets imagine a real world scenario: Imagine that a user ...
5
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3answers
1k views

HMAC What is secure manner to distribute shared secret between client and server?

I am looking at ways to secure http communication using HMAC. My understanding is that in this scenario the client and the server both know a secret. This means the secret must be first generated on ...
3
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2answers
557 views

what is the difference between a mac and a digital signiture

I understand that a MAC algorithm takes a message and a private key as input and hashes them to a value. I understand that senders and receivers often use MACs to authenticate a message and check the ...
2
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1answer
451 views

Improving Digest Authentication using PBKDF2

For a variety of reasons, I need to use digest authentication for a REST server that I have created. I have come up with an "improvement" that I believe strengthens the algorithm against MD5 attacks ...