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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520 views

What user was this spammer trying to authenticate as?

I have a custom application that monitors and logs a user's SMTP session, and came across this spammer trying to use my MTA as a relay. Is it possible to determine what username they are trying to ...
5
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3answers
2k views

Delivery Failure Notification spam protection?

My domain (example.com) has recently been targeted by spammers who are sending email (somewhere) but forging the sender as random-name@example.com. I have been getting flooded by delivery failure ...
1
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1answer
102 views

How to detect suspicious tokens collected by a hacker

I previously asked a question here What's the use of adding a challenge in the otp algorithm? Let's suppose that a hacker has succeeded to collect tokens. Is there a way to detect suspicious ...
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3answers
293 views

Mass account lockout prevention using CSRF tokens

I'm currently working on reducing the risk of mass account lockout on a site that (unfortunately) issues sequential, numeric user IDs. Changing the structure of the userID is not an option at this ...
21
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1answer
4k 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
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2answers
808 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
312 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
94 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 ...
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6answers
13k 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 ...
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4answers
1k 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 ...
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3answers
572 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
380 views

Implementation of Blizzard's Mobile Authenticator

How is the Blizzard Mobile Authenticator implemented? Does it happen to use OATH-TOTP or something similar?
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2answers
132 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 ...
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1answer
1k 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 ...
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4answers
66 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 ...
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2answers
90 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. ...
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1answer
381 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 ...
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2answers
1k 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, ...
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1answer
559 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 ...
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1answer
113k 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?
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4answers
1k 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
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2answers
126 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
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3answers
186 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 ...
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4answers
2k 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 ...
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2answers
129 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
764 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 ...
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3answers
1k 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 ...
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3answers
326 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 ...
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5answers
4k 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 ...
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1answer
497 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? ...
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1answer
176 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 ...
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3answers
1k 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 ...
7
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1answer
3k 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 ...
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4answers
5k 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 ...
40
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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 ...
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2answers
2k 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 ...
2
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1answer
361 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 ...
12
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7answers
22k 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
913 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 ...
8
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6answers
4k 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 ...
4
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2answers
519 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 - ...
5
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4answers
348 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
172 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
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3answers
227 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?
5
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1answer
1k 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 ...
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3answers
445 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
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2answers
351 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?
3
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1answer
433 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
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2answers
226 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 ...
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1answer
221 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 ...