Authentication - establishing the authenticity of a person or other entity. Not to be confused with authorization - defining access rights to resources.

learn more… | top users | synonyms (1)

5
votes
2answers
150 views

Is it common for a One-Time-Password system to become unsynchronized?

One-Time Passwords look like they can play a helpful role in a layered-security system, yet their use, especially paper-based TANs seem like clients could be vulnerable to getting out of sync with the ...
1
vote
1answer
111 views

Secure authentication cookie for web site

Hello i want to know if this auth token is secure enough for a site of millions of logged in users: ...
8
votes
1answer
1k views

Designing single-sign-on with JSONP/CORS?

I like the way that OAuth/OpenID can authenticate/identify a user from another domain, but only if the other domain allows it (presumably on the user's instructions). I would like to do something ...
7
votes
3answers
3k views

Terminology: authentication vs verification

The two words have a similar meaning and I'm having difficulty adequately explaining the difference to someone. You verify a person's identity by having them show a form of identification, such as a ...
5
votes
1answer
220 views

Motorola Human Authentication Pill/Vitamin Security?

This appears to be hot news today, Motorola announced a form of pill that a user can swallow which is activated and powered by stomach acids and transmits a signal back which can be used to ...
1
vote
1answer
165 views

Do I need logging enabled in my rules in IPFW for sshguard-ipfw to work/blacklist ip's?

From the FreeBSD handbook: Even with the logging facility enabled, IPFW will not generate any rule logging on its own. The firewall administrator decides which rules in the ruleset will be ...
6
votes
2answers
354 views

Do keyfiles actually add any meaningful security in the presence of strong passwords?

In the context of protecting access to local encrypted files or devices against a determined (and competent) adversary, is there any reason to believe that the use of a key file actually presents a ...
2
votes
2answers
276 views

Can unencrypted keys & logins be kept out of program memory?

No matter what technique is used to store encryption keys & logins, it seems that all roads lead back to program memory (as far as I know), as an unencrypted version of the keys & logins will ...
1
vote
2answers
1k views

Security benefits of Single Sign-On [duplicate]

What are the benefits of a single sign-on implementation from the point of view of security? From my point of view, if the account is compromised the attacker has access to any resource, so ...
20
votes
1answer
687 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 ...
8
votes
2answers
485 views

How is an HTTPS login secure when pages use HTTP?

When someone go to eBay's website, they use an unencrypted connection between their PC and eBay's server. If they sign in, they are redirected to a secure site identified by its certificate and may ...
2
votes
1answer
520 views

Is TextKey SMS 2 factor authentication secure against cell phone cloning?

I came across this website today that implements SMS based authentication that works "opposite" most SMS authentication methods. In typical SMS authentication, the provider sends you an access code ...
3
votes
2answers
229 views

Does providing OAuth for mobile apps pose a security threat?

Let's take a look at the basic OAuth workflow: The basic idea is that the Consumer (App) asks the user to grant him access to the Service Provider. The service protects the user by asking him each ...
4
votes
3answers
463 views

How can I verify the identity of a US | UK -based person and prevent *fake identities* from being accepted?

Given that it's possible to fake ID cards and fake social security numbers are created, I need to ensure that all users of my site are US or UK based citizens, and don't have more than one account. A ...
3
votes
2answers
374 views

Login with a hash. Is this secure enough?

I need to provide store's clients with a tool to check the status of their repair orders. The clients doesn't have a user or password. They are only a record in the database. Yet I need to give them a ...
5
votes
5answers
3k views

How secure is using CRAM-MD5 for email authentication, when not using an SSL connection?

Background: My current server-provider tells me it's no problem to store the passwords in plain-text in the database, saying he has to do so because they use CRAM-MD5 for email authentication. My ...
2
votes
2answers
2k views

Force SSL/TLS client cert authentication even if server does not request it?

Usually the server specifies in the Server Hello message if a client certificate is needed/wanted. Does anybody know if it is possible to perform an authentication via client cert if the server does ...
10
votes
5answers
2k views

CSRF protection with Session Id

To protect against CSRF, couldn't my page javascript just dynamically insert the session id from the cookie into the body of each HTTP request right before it's sent? The server would then just ...
30
votes
7answers
6k 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 ...
-11
votes
1answer
445 views

Can a cracked antivrus software do the job? [closed]

Some of my friends say that their cracked antivirus software updates regularly, and does the job as same as a legitimate software would do. Is this possible? How do they bypass the activation key ...
5
votes
0answers
564 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 ...
13
votes
2answers
785 views

Is it okay to sign a PGP key without an IRL meeting?

[PGP] can get paralyzed by excessive analness. — Phil Zimmermann Preamble I am in the process of building my own web of trust. That is, I want people (PGP users…) to be—fairly—sure that, by ...
1
vote
5answers
285 views

Should I enforce a password policy on a web site?

For a commercial web site, is it important to impose some restriction on passwords to access the system? Eg. special $char, Upper and lower case, numbers, at least a minimum length... Can a CAPTCHA ...
3
votes
2answers
1k views

How can I implement authentication in my proxy server?

I have a proxy server, it will have a captive portal page. Users will be required to sign in before gaining access to the internet. So far I am aware of IP and/or MAC address based authentication. ...
1
vote
1answer
151 views

Simple and secure remote installation method that accepts input via a web page?

When installing software on a remote server: Is it possible to let the admin (i.e. the user that installs the software) define admin username and password via a HTML page, in a secure manner? ...
6
votes
3answers
329 views

Does prompting for security questions on new computers add any security on banking websites?

When you sign into Bank of America on a computer you haven't used with them before, the site prompts you to answer one of your security questions. How exactly does this make the site more secure? ...
2
votes
2answers
1k views

How can Bank of America tell that I'm logging in on a computer I haven't used with them before?

When you sign into Bank of America for the first time on a computer that you haven't used with them before, they detect this and force you to answer one of your security questions. I think I've seen ...
2
votes
1answer
118 views

Send credentials by sms [duplicate]

If a user forgets his login credentials for a web site, is it secure enough to send users credentials by sms?
3
votes
1answer
175 views

How do you evaluate and audit Central Authentication Service (CAS)?

This is in reference to Jasig's CAS software and I'm looking for a checklist to audit the state of security of a CAS implementation. While the Jasig site has a lot of documentation and their mailing ...
8
votes
3answers
520 views

Why would a website allow answers to security questions to be used interchangeably?

I needed to reset my password on a website that uses security questions for the purpose, and I noticed something strange. My hypothetical security questions are (not the ones I actually use) are: ...
63
votes
3answers
18k views

How does Google Authenticator work?

Google Authenticator is an alternative to SMS for 2Step verification, installing an app on Android where the codes will be sent. It works without any connectivity; it even works on plane mode. This ...
0
votes
2answers
160 views

How to allow only the public key owner to submit requests to my site? And what is this type of security called?

This was probably asked many times here, but I'm not finding any because I'm not sure what to look for. I'm developing a simple payment gateway, where partners (consumers) can submit requests so ...
2
votes
3answers
277 views

How good is validating source with request.referer than checksum?

I have 2 portals(both are under my control & domain names are different) In 1st portal, there is a link on click of which User can directly get logged into 2nd portal. Link which will be hit in ...
158
votes
7answers
27k views

What's the rationale behind Ctrl-Alt-Del for login

Why is Ctrl+Alt+Del required at login on certain Windows systems (I have not seen it elsewhere, but contradict me if I'm wrong) before the password can be typed in? From a usability point of view, ...
3
votes
1answer
142 views

Are there any uses of having a non-deterministic salt value for hashes?

So I've been toying with the idea of having non-deterministic salt values for hashes. Let me explain what I mean: Basically, I applied some properties from Bitcoin including a "difficulty" (ie, ...
15
votes
1answer
11k views

Configure SSL Mutual (Two-way) Authentication

A lot of tutorials, a lot of pages, a lot of question and they differ in implementation of this issue "Configure SSL Mutual (Two-way) Authentication". I have to do it with Linux, and I don't know from ...
3
votes
4answers
3k views

Is it safe to allow users multiple login at different browsers & computers?

We are currently developing a web application. The developers have allowed multiple login. e.g an user can log-in to multiple computers at the same time. They are quoting Gmail account as an example ...
7
votes
4answers
329 views

Candidate authentication in large scale assessment

First of all, I'd like to apologize beforehand if the questions I am about to ask are not really suitable for this site. I could not think of any other category to post under. Right, here goes. We're ...
2
votes
1answer
92 views

Authenticating a ciphertext

what can be considered as a downside of authenticating a ciphertext? For example, can we say drawback of authenticating a ciphertext is that we lose repudiation, for example, we can't prove to the ...
3
votes
2answers
203 views

Are there any serious problems with this method for generating single-use tokens?

I need your advice on the security of this design. I have a scenario whereby a server application and a smart card application need to share a value e.g. 52, which has been encoded in a long decimal ...
1
vote
1answer
153 views

What manufacturers create OATH HOTP cards now that InCard Technologies is no longer in business?

I purchased the following OAUTH HOTP card from Verisign. I'm intrigued by the security possibilities that this form factor provides and what customizations to the circuit logic are possible. On ...
4
votes
2answers
534 views

How Secure are Authenticity Token in Rails

I came across a website which uses Rails Authenticity token to prevent CSRF attacks. My concern here is that I can see the authenticity token in the source code of the web page. If any other service ...
0
votes
1answer
351 views

Facebook Login for Intranet

How safe is Facebook Login? I'm currently building an intranet, for my small company. We're 10 employees, and no risk of them messing up from inside. But is using Facebook Login safe for this? How ...
8
votes
3answers
13k views

Is there any SQL injection for this PHP login example?

I want to write a login form, and I got one example from the web. I want to know, if there is any SQL injection for this code? If there is, what could the exploit's web form entry look like? This is ...
2
votes
4answers
779 views

If someone steals my laptop while I'm logged in, how can I protect my browser?

My question has its roots in an xkcd from this week: http://xkcd.com/1200/ Isn't this true and ironic? We place so much emphasis on browser security and OS security -- and rightly so -- yet if I ...
5
votes
1answer
1k views

How do I make or get computer certificates to use with IPSEC user authentication on Windows?

I am having trouble and need some direction using computer certificates with Windows 7 firewall IP Security rules, using certificates only for user authentication. I can get everything to work ...
6
votes
3answers
190 views

Is there any sense in using two-step authentication for personal email address?

There is two-step authentication available at gmail and outlook as well. There are some using it, but the majority doesn't. In what cases it is recommended? If I have a strong password what are the ...
5
votes
1answer
172 views

Authentication concept for sites served to another site

We are going to serve content to a Content Management System that embeds it through an iframe (yuck). Some pages that we serve need to be authenticated before – only a valid user should be able to see ...
2
votes
1answer
242 views

User Authentication API

I'm developing a web API for a user database that will be used to verify a given username / password combination is valid. I'm just looking for comments / criticism on the following method that I'm ...
8
votes
5answers
4k views

What are the ways to implement two factor authentication?

We have devices that can generate tokens. So we can use tokens with passwords to perform two factor authentication. There are many ways to implement such systems to enhance security. One of two I ...