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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14
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1answer
2k views

Is there a standard for printing a public key as a barcode?

Is there a standard for storing a public key printed on paper? Say, I want to hand out business cards with my public key pre-printed on them at a key signing party to help build the web of trust. My ...
5
votes
2answers
703 views

Could this login form be “hacked” to allow access?

We have this legacy website which has horrendous code in it. I have just been looking through the login form/code and can see un-sanitised sql queries. E.g. in a nutshell: $email=$_POST['email']; ...
5
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2answers
229 views

Authenticating client without hardcoding key?

A basic question, but I'm not a master and this is puzzling me- How is it possible to authenticate a client from the server's perspective? i.e. imagine you're the server, and you want to give the ...
2
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2answers
91 views

Are there any nice info sites dedicated to explaining how and why to (not) store user passwords in the database?

I keep finding various websites that are able to email me back my password. I try to email them every time, telling them about this. But it can be tricky to be taken seriously - it's just a random ...
10
votes
6answers
7k views

Securing an API for mobile access

I've built a nice REST/JSON API that is used by other companies (our clients) as a B2B service. Each of our clients has a username/password pair, and we also do HTTPS and validate the source IP of ...
6
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4answers
784 views

Password hashes should run md5 thousands of time: really?

I skimmed through How Companies Can Beef Up Password Security and I thought that several assertions were completely wrong, in particular: Cryptographic hash (like md5) with salt are bad. It isn't ...
1
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3answers
439 views

Login System Security Suggestions

I am creating a login system and was wondering if anybody had any suggestions. Here is my current setup: nonce to check if the login originated from our login form session and cookie auth mixed - in ...
3
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1answer
298 views

Implementation of Blizzard's Mobile Authenticator

How is the Blizzard Mobile Authenticator implemented? Does it happen to use OATH-TOTP or something similar?
1
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2answers
108 views

How do i use a guessable ID for authentication

This question doesn't fit well in many categories but hopefully someone's run into it before. I'm developing a web api that will interact with a physical device. Each new physical device has it's ...
1
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1answer
885 views

Google custom Search Engine api key: is it confidential?

Normally, I'd say yes, api keys should be kept secret, and Google's api console even says that. However, I'm just making an ajax get call and all the info is in the clear on my page in order to ...
1
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4answers
64 views

When (if ever) should web app force numerical, generated (hence hard to remember) logins?

Some bank sites force me to use system generated numerical login (ie. 8 digit number). Apart from singnificantly decreasing usability and giving impression of security (to some), does it serve any ...
1
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2answers
87 views

How are 2 Open IDs linked on StackExchange?

I have an account with Google & Facebook. Login IDs for them both are same (same gmail id). When logging into StackOverflow using either of Google or Facebook logins would link to same account. ...
1
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1answer
312 views

What makes a secure smartcard secure? Is contactless/RFID better?

In short what security features exist that I should look for in a smart card? What physical features exist, which are important? It appears smart cards may exhibit different levels of wear and ...
1
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2answers
598 views

How does DCOM authentication compare to RPC based authentication/auth?

The following paragraph from MSFT Best Practices for 2003 PKI says Windows 2000 authenticated via RPC vs 2003 that authenticates using DCOM A CA running Windows Server 2003, Enterprise Edition, ...
0
votes
1answer
404 views

How do I constrain Windows Smartcards for AD Authentication so that “anyExtendedKeyUsage” is not implied?

This document describes how there are 3 ways to constrain a SmartCard certificate The Enhanced Key Usage field defines one or more purposes for which the public key may be used. RFC 5280 states ...
12
votes
1answer
62k views

How do I clear cached credentials from my Windows Profile?

Windows seems to be saving my credentials for a variety of applications (terminal servers, etc) and I'd like to purge this data. How can I backup and purge this data?
2
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4answers
730 views

Using only password to authenticate user (no “username” field)

I am creating a client access system, to allow manage invoices, make payments, access information about their products and information/functionality alike. Supposedly there are less than 1000 ...
2
votes
2answers
95 views

Using External Certificates on a network that doesn't permit outbound HTTP/S access

Some highly secure networks and DMZs prevent all communication to outside hosts. This can cause issues with validating externally signed data I can guess that issues with signature validation occur ...
2
votes
3answers
142 views

Whether certificates can be used for regulating access

I am thinking of a mechanism where I need to authenticate the client and control the access. I am thinking of using SSL for this purpose. I want to know whether using SSL solves my purpose. My ...
2
votes
4answers
1k views

Why does my bank use this verification method?

I hold my business account with Lloyds TSB [UK] and the process for logging in to their online banking service(s) is as follows: Login page Enter customer number Enter password Put debit card into ...
1
vote
2answers
119 views

Does Convergence solve the problem of hacked CAs?

My question is about the Firefox AddOn Convergence. So my question is if it is possible for convergence to observe that a phishing-site which is verified by fake Certificate because a hacker of a CA ...
3
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2answers
576 views

failed login attempts analysis

Is there any open source project that logs all the failed login attempts over a period of time and gives me analysis of the same, the login failure is at windows or unix or mac user authentication ...
7
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3answers
708 views

Getting started with SmartCards; what equipment do I need, what do I need to know?

I have an unused SmartCard slot on my laptop and I want to learn how companies take advantage of it. Are all SmartCard slots capable of reading and writing a blank card? Are there compatibility ...
2
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3answers
231 views

How should one manage authentication on custom line of business software

I am writing line of business software for a company, and we want to authenticate users, so we can manage workflow and do some auditing. Basically my employers don't want me to piggyback off of ...
4
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5answers
2k views

How secure are “mobile authenticators” versus traditional key fobs?

Two-factor authentication, password + device, seems to be increasingly mainstream among consumers with products like Activision Blizzard's Battle.NET authenticators. However, I am curious what the ...
1
vote
1answer
324 views

Using Tokens to Keep Users Logged In

I'm a PHP web developer who has been reading up on security recently and consequently this question entered my mind: How to properly and securely authenticate already-logged in users with a token? ...
-1
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1answer
170 views

About important hacks in history [closed]

I would like to know how important hacks happened, because I can figure out how they hacked a website but I can't figure out how did they hacked into NASA International Space Station source code. Or ...
8
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2answers
751 views

HMAC Based Request Signing - Storing the Salt

I'm working on a (non high security) project that currently isn't live but might go live at some point. We have a REST API (implemented using Restlet and Neo4j) running on a server and an Android ...
6
votes
1answer
2k views

Does NIST really recommend PBKDF2 for password hashing?

We hesitated between BCrypt and PBKDF2 for password hashing. In many forums and blogs people say something like "In their Special Publication SP 800-132 NIST basically recommends using PBKDF2 for ...
3
votes
4answers
3k views

Two-factor authentication w/certificate and username & password?

Example scenario: ActiveSync Authentication method: certificate-based authentication AND Active Directory domain username-password Encrypted on device: public & private key AD username ...
29
votes
1answer
2k views

What's the risk if I accidently type my password into a username field (Windows logon)?

I'm used to logging into my personal Mac which is a password-only field (like waking from sleep mode). Sometimes I have to use a Windows network on which I have an account, but of course I have to ...
4
votes
2answers
979 views

MAC vs Encryption

I understand the difference between MAC (eg. hmac_sha256, etc.) and Symmetrical Encryption (eg. rc4, etc.), but my question is what advantage does MAC solve that using encryption doesn't? I know that ...
1
vote
1answer
250 views

Authentication for a batch script

It seems amazing that there is no industry accepted best practice for this problem yet (or maybe just one I'm not aware of): What is the most secure way for a batch script, a program needing to ...
11
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7answers
15k views

Can my email account be accessed without the password? How secure is it?

Can my email account be accessed without the password, and how secure is email if I store my personal documents on it? And how come Yahoo Mail asks me to tell them my friends and folders names to ...
3
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4answers
688 views

Can we prevent a man-in-the-middle attack with symmetric-key cryptography?

Suppose that Alice signs the message M = "I love security" and then encrypts it with Bob's public key before sending it to Bob. As well known, Bob can decrypt this to obtain the signed message and ...
7
votes
6answers
2k views

Is tokenless (specifically SMS) 2FA a security compromise over OTP tokens?

I've been looking into the various pros/cons of tokenless (particularly SMS based) and traditional token based two-factor authentication (think RSA SecurID). After doing some research, I think I have ...
3
votes
2answers
437 views

intrusion detection on own hotspot?

Is it possible to detect failed logins on the hotspots you create with your windows/linux laptops? So you can detect some dumb brute force/guessing attempts? For example, a log like this: TIME DATA - ...
4
votes
4answers
301 views

Voting System, is there a hole here?

I had this idea a few years ago and improved it today as I notice a hole or two. I believe I have the system down right but If there was a hole the first time there may be a hole this time. I believe ...
5
votes
2answers
157 views

What are the risk tradeoffs of all-in-one “smart” IDs vs. using a separate hardware authenticator?

In many organizations these days, employee IDs are very mutli-functional. They can serve as: Visual identitiy verification. (Including employee photo, name, ID number, and other details on the ...
2
votes
3answers
194 views

Emerging Standards for file transfer and integrity check?

What are the emerging standards for file transfers (including online transactions)? How about for file integrity checks?
4
votes
1answer
673 views

Is this admin area secure enough? V2

This is a response to my previous question, Is this admin area secure enough?. There were some very helpful answers there, for which I am very grateful. So I went back to the drawing board and here ...
3
votes
3answers
369 views

Is this admin area secure enough?

EDIT: Please view the revised question instead The admin area has special access to the database (modifying orders, etc). To help explain, I drew a diagram, so here is my process: Notes: I ...
2
votes
2answers
316 views

Why superuser or administrator account should never locked?

Why should administrator or superuser account never locked regardless how many incorrect login attempts are made? What should be done instead to alert the staff to the attempted instrusion?
2
votes
1answer
360 views

Cookie based session variables

I have a situation in which I cannot use a server-side session, but must allow users to log in, and for their logged in state to be persistent between queries. As with anything that involves crypto ...
1
vote
2answers
167 views

X509 mutual authentication: is there a security flaw?

On the client side, my application accepts the server's certificate in case of the client certificate being signed by this server cert. Is this correct or may it be dangerous? Is it better to ask a ...
0
votes
1answer
174 views

Authentication methods without trusting 3rd parties unless explicitly indicated

The plan is to have a situation in which no third parties have to be trusted unless you explicitly indicate so. For example CA's are only used when the contact explicitly added the CA as a trusted ...
1
vote
1answer
109 views

Viable way to authenticate certificate without a web of trust?

For SSL certificates we have a web-of-trust principle. If we are allowed to make alterations to the certificate format, are there viable ways to automatically or semi-automatically authenticate the ...
5
votes
2answers
3k views

Full disk encryption and multi-factor authentication

All serious full disk encryption schemes I have looked into use a static password for authentication. For example, TrueCrypt supports two-factor authentication with keyfiles, but not for system ...
2
votes
1answer
536 views

Implementing 2-step verification via email for web apps?

I was thinking of applying 2-step verification to my web apps that will work similarly to Gmail's SMS/voice 2-step verification, except my web app will just email the verification code each time a ...
1
vote
1answer
251 views

How can a SAML Relying Party redirect to one of two IDPs?

We need to support the following Authentication flows User 1 logs into Salesforce using Salesforce Credentials User 2 logs into Salesforce using Arcot +Ping + Siteminder credentials User 2 logs into ...