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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What is the difference between authorized_key and known_host file for SSH?

I am learning basics of SSH protocol. I am confused between the contents of the following 2 files: ~/.ssh/authorized_keys: Holds a list of authorized public keys for servers. When the client ...
1
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3answers
1k views

Testing http authentication via netcat

I'm currently trying to track down what I think is a false positive from Nessus, my attempts to netcat into the device are failing, but I believe the service is shut off anyway and Nessus is being ...
10
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4answers
6k views

What are the disadvantages of single sign-on authentication?

We were discussing to implement single on in our web application,right now after analyzing we came to know that the following were the advantages of single sign on authentication. Advantages Users ...
12
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1answer
1k views

When authenticating ciphertexts, what should be HMACed?

Some have argued for using AES-256-CTR with HMAC-SHA-256 for authenticated encryption over AEAD-specific modes like EAX and GCM. However, when doing, this, what should be HMAC'd? And how? ...
2
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1answer
689 views

Can I check if a work colleague logged into my user account on a shared computer?

I think that someone at work has logged onto my user account when I'm not in work and moved some files from my desk top to my work in progress. Can this happen? They may know my user name as this is ...
2
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1answer
210 views

What authentication threat data exists?

I recently read an article that said there was not much data on which authentication threat vectors were actually being exploited in the real world. Eg what percent of password theft was by ...
5
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1answer
710 views

A Secure Cookie Protocol

As title says I'm trying to implement a secure cookie protocol HMAC(username|expiration name|data|session key, sk) It seams that session key is not constant during whole application session ...
-1
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4answers
181 views

How secure is this login page? [closed]

Unfortunately I cant link to the page (it internal). But I can describe it! This is a lightspeed systems policy enforcement login page (content filter). The page is http and there is no iframe with ...
5
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2answers
168 views

Windows Vista user logon integrity

Is it possible to delete some or all user session logon datetime records from Windows Vista? Is there any mechanism to give me confidence that individual records aren't deleted even if there isn't a ...
22
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4answers
6k views

How secure is Windows 8's Picture Password login?

The final Windows 8 build has been released to manufacturing. One of the new features of Windows 8 is "Picture Password", where the end user logs on to Windows by clicking a specific pattern on the ...
5
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4answers
2k views

MDK3 warns about WPA2 downgrade - how do I find the key in Wireshark?

While stress testing my router using MDK3, I got the message "REALLY BIG WARNING!!! Seems like a client connected to your target AP leaks PLAINTEXT data while authenticating!!" I viewed the tool ...
21
votes
5answers
19k views

Preventing deauthentication attacks

I am helpless against some kiddy with backtrack who repeatedly uses aireplay-ng to deauthenticate legitimate users on my Wifi work network. I captured and analyzed the network traffic on my Wifi work ...
7
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1answer
2k views

Store user passwords in NoSQL database?

I am currently coding the backend of a website and I have not come across an article where this is discussed. I want to store all my application data in MongoDB but I'd like to split out my sensitive ...
38
votes
4answers
33k views

How do I secure my REST API?

In Detail here's the problem: I'm building an Android app, which consumes my REST API on the back-end. I need to build a Registration and Login API to begin with. After googling for a while, I feel ...
6
votes
4answers
1k views

Password-free logins using your email address only?

The state of logins is horrendous. With each site having it's own rules for passwords, it can be very hard to remember what variation you used on any given site. Logins are pure pain. One thing I ...
8
votes
4answers
965 views

Are Java applets more secure than regular forms for login?

In Norway we have something called BankID which is a login solution for banks and other stuff. It consists (from a users point of view) of a Java applet where you enter your SSN (person number), a one ...
8
votes
6answers
1k views

POP3/IMAP Stronger Authentication

We recently deployed a two-factor-authentication solution in order to strength logon to our web applications (one of them is web based mail, Microsoft outlook web access) Most of the users who have ...
53
votes
3answers
63k views

Token-based authentication - Securing the token

I have developed a backend REST API for a mobile app and I am now looking to implement token-based authentication for it to avoid having to prompt the user to login on every run of the app. What I ...
2
votes
1answer
203 views

Safe User Login Questions

I need help determining how safe the login is. First of all, I have been reading this: The Definitive Guide To Forms based Website Authentication It's really well written, great information most of ...
2
votes
2answers
136 views

Is this login authentication safe?

I have been thinking of a way to authenticate users so as to pick out the users using cracked versions of my game from the people who have actually bought it. I came up with this idea: The client ...
2
votes
1answer
2k views

Should we block all plaintext authentication and require authentication over an encrypted channel?

Should we configure our servers to require the authentication happen over an encrypted channel and block all methods of unencrypted, plaintext authentication over? I recently configured my servers to ...
7
votes
2answers
4k views

Help understanding basic user authentication with salts and hashing

I for some reason am not understanding how to execute a secure authentication between client and server for a user. I've read many resources, and I understand how to use the hashing and salting tools, ...
17
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6answers
5k views

How to verify that someone is who they say they are online?

I am working on an online job application web app and the question has come up about how we will verify that someone submitting an application is who they say they are. For example, we don't want ...
18
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4answers
1k views

Effectiveness of Security Images

Do security images such as those presented upon logging into banks provide any tangible security benefits, or are they mostly theater? Per my understanding, if somebody is phishing your users, it's ...
3
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1answer
422 views

How strong are google's Application-specific passwords? [duplicate]

Possible Duplicate: Google Account: implications of using application-specific passwords In 2-step verification of google accounts, we need to use the Application-specific passwords ...
1
vote
4answers
173 views

how to identify whether my page is phished or normal page?

Usually I differentiate phished page and normal web pages by seeing https before the address of the web page, as the lock symbol will help us to identify. Are there any other methods to differentiate ...
6
votes
3answers
403 views

How can Microsoft validate a shorter password on Microsoft accounts (MSDN)?

I recently ran across this when logging into MSDN. (I saw this screen after typing my initial credentials.) I have a 20+ digit password, however there's apparently a new requirement for Microsoft ...
21
votes
4answers
7k views

Are there technical disadvantages in using free ssl certificates?

Note this question is related, except this one is about free SSL certs. There are providers who are offering totally free entry-level SSL certs (like StartSSL). I was wondering if they are ...
8
votes
5answers
1k views

How do RSA fingerprints protect from MITM attacks?

I understand that RSA fingerprints are used to verify that you are really connecting directly to who you want to connect to, and not someone else posing as that site. Like when you do a git push, it ...
6
votes
5answers
3k views

Is there a reason to protect SIM with PIN?

If phone would be stolen then SIM card will be thrown out by thiefs just after the theft so that they can't be found. If phone would be losed then it will be harder to find an owner for people that ...
4
votes
3answers
5k views

Do you need to encrypt session data?

I came across a session management class in PHP which encrypts session data in the session storage folder (i.e., /tmp) and can be decrypted later in your script using a key. I was wondering if it's ...
7
votes
4answers
492 views

Should SMS systems warn users of possible spoofing attacks?

The author of this blog post Never trust SMS: iOS text spoofing says that: The sender of an SMS message may provide arbitrary sender information using low level protocol features. Furthermore the ...
-1
votes
2answers
125 views

Should I use salt to authenticate data?

I have a client and a server. The client makes a request containing userId, cardId, position (on the card) A hacker could just do the same http request with the next position. So I think about ...
5
votes
4answers
389 views

Automating Social Engineering Prevention

Being an advocate for DIO (defensive information operations), I have always been concerned about social engineering and its relation to server security. Giving administrative access to staff members ...
2
votes
1answer
141 views

Is Creating a Restricted Database User in Microsoft SQL Server Decent Protocol

Forgive me for the heavy metaphor but it's a situation's complexity kind of goes over my head. Assume I'm Leonard Shelby (My short term memory only lasts 5 minutes). I'm a freelancer that reads ...
9
votes
4answers
5k views

HTTP Basic auth password storage more secure than Digest auth

If you are using SSL already, it appears Basic auth is the way to go since you can perform bcrypt with the password when you store it in the database, where as Digest auth only allows md5. As we know, ...
8
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4answers
4k views

Is it okay for API secret to be stored in plain text or decrypt-able?

Aren't API keys considered usernames and API secrets considered passwords? Why is it that API servers like Amazon Web Services allow you to view your API secret in plain text? It makes me think they ...
3
votes
5answers
2k views

How to secure a server backend

I am developing a server which serves two purposes: it is a CMS for people to use and maintain some data, and a Web Service for a mobile app to get this data. It runs on a Debian server running Tomcat ...
1
vote
2answers
1k views

Signed request vs HTTP digest auth for API authentication?

By signed request I mean something like this (simplified example): Client creates a sig in his request: $sig = hash('sha256', $api_key.$data); which generates 7409ur0k0asidjko2j for example. He then ...
20
votes
4answers
7k views

Google Account: implications of using application-specific passwords

In the wake of the recent Mat Honan story I decided to try out two-factor authentication on my Google account. But in order to keep using it with Exchange, the Android OS, Google Talk and Google ...
7
votes
4answers
409 views

Isn't OpenID over HTTP (not HTTPS) fatally flawed when delegates are used?

First, I have a private delegate set up on my web site for OpenID and pointed my SE account at the URL on my web site; SE has no knowledge of the actual OpenID provider endpoint until my delegate ...
7
votes
2answers
746 views

Replacement for One Time Passwords (OTP)

OTP may known as new generation of password security techniques, but I want to know does it still safe enough after several years of appearance or it will deprecate soon? & what would be the ...
5
votes
2answers
852 views

Encrypting/decrypting information in database

So, let's say I have a secret message I want to encrypt and store in my database, from where an authenticated user can retrieve, decrypt, read, update the message. EDIT: the issue I'm encountering is ...
18
votes
4answers
6k views

Password resets - what practices should web services follow?

Many of you may have seen How Apple and Amazon Security Flaws Led to My Epic Hacking, where a Wired reporter's Amazon, Apple, Gmail, and Twitter accounts were successfully hacked. The hacker followed ...
4
votes
1answer
511 views

How to verify the authenticity of Facebook users?

While I was not surprised at all by Facebook stating that "8.7 percent of accounts belonging to its 955 million monthly active users are fake"; link is a news story that providers a summary of their ...
0
votes
1answer
282 views

Can I export my digital certificate to this emtec usb

It is said here http://www.emtec-international.com/sites/default/files/s530_aes_en_0.pdf 2048 bit RSA module: ready for PKI application SHA256 data hashing: ready for digital signature Does it ...
8
votes
2answers
10k views

Creating user specific authentication methods in SSH

I have configured sshd on an Ubuntu server to use key authentication and it is working fine. I had to disable password authentication for key authentication to work. Server is always accessed via ...
15
votes
4answers
515 views

Why aren't digital signatures the standard way to authenticate web clients?

The web is a mess of incompatible cookie schemes, asinine requirements ("your password must contain letters, numbers, and at least one symbol from !()-_., and must begin with a letter, and once you ...
2
votes
1answer
451 views

How can passwords be stolen from Yahoo?

I always understood that servers don't actually store user passwords. Instead, they store hashes of passwords and then they validate the user input by applying the hash function, then compare the ...
2
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3answers
269 views

Why would it be a good idea for someone to get or not to get a Yubi key [closed]

In what uses would it be smart to get a Yubi key?