Specific to the security of passwords: hashing, entropy, cracking, resets, lockouts, etc.

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3answers
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Resetting passwords howto

I am currently in the process of designing a registration form for the users to register accounts. The accounts will contain a lot of personal information, so I want to ensure highest possible ...
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3answers
2k views

How important it is to change password regularly? [duplicate]

A WWW-site guided me to change the password regularly. Should I believe what the say, if my current password is long enough random string?
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4answers
8k 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 ...
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2answers
133 views

Simplest way of hashing a password with multiple different hash algorithms [closed]

I have a list of plaintext passwords that I would like to hash with various different hash algorithms (for educational purposes). As a minimum I would like to obtain hashes under MD5, SHA1, SHA256, ...
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1answer
164 views

Should I NOT choose a password of max allowable character length?

Q: Suppose an attacker knows the max allowable character length, n, for a website's passwords. Would it be smart for them to attack passwords of length n BEFORE length n - k (where k is small portion ...
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2answers
7k views

Bypassing the BIOS password

Are there any reliable methods that allow an attacker to bypass a BIOS password, or alter BIOS settings without entering the password? A few ideas come to mind: The old battery trick (remove ...
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2answers
870 views

Appropriate response to 2014 Russian Security Breach (CyberVor)

The report from Hold Security says that 1.2 billion sets of credentials are in the possession of this party. I have a feeling that this report may be a hoax or a partial hoax due to grammatical errors ...
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3answers
205 views

Should I implement my own local password hash?

Having a more-than-elementary knowledge of internet security, I've realized that some web applications and websites I use implement a less-than-ideal password policy. Some examples include: ...
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5answers
328 views

Why after a website password reset am I asked to login again?

I have noticed that every web site has the exact same behavior for their password reset pages. They send a link to your email using which you can reach the password reset page. On that page you enter ...
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38answers
8k views

What is your way to create good passwords that can actually be remembered?

What are the methodologies which can be used to generate "human" good quality password? They have to ensure a good strength and also easy to remember for a human being.
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2answers
103 views

Share passwords between developers [duplicate]

We have a project with 3 remote developers and myself, at the moment passwords (server logins, db passwords etc) are being shared via emails which are cc'ed to everyone, Is there a normal workflow ...
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5answers
6k views

Is Linux really that secure, with only root password denying external access?

While I was searching online for information about Linux security, the most typical explanation was: Linux is secure, because the root password is required to access the kernel and install new ...
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2answers
1k views

Is it bad practice to ask only for individual characters of a password? [duplicate]

Some financial websites that I use use passwords in a peculiar way. Instead of asking me the whole password string, they only ask me to enter e.g. "3rd, 5th and 8th character of your password", i.e. a ...
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2answers
144 views

How to combine a key and a password in practice

Alice wants to encrypt her data. She is not comfortable with using only a password. While she prefers to use a properly random crypto key, she isn't confident she can protect the key file from theft ...
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0answers
28 views

Syncing service passwords during offline installations

Due to very paranoid customer requirements, we have to install several Windows services on two different systems that should run under a shared service account. Each system should each have a copy of ...
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3answers
178 views

User Account Guessing [duplicate]

I'm doing some research on user account guessing, and wanted to ask a question about some "bad practices". My thought is generally this is a trade-off between great user functionality/UX and ...
27
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4answers
5k views

How secure are my passwords in the hands of Firefox using a Master Password?

I'm relying on Firefox to remember my passwords, using a Master Password of more than 25 characters. How secure is this set-up?
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1answer
316 views

Cracking a 6-character alphanumeric password Windows dialog box

To put this problem in context, I have a touch monitor screen whose firmware program is protected by a password. The firmware program is downloaded over RS232 via a Windows utility program provided ...
186
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18answers
14k views

Passwords Being Sent in Clear Text Due to Users' Mistake in Typing it in the Username Field

Upon reviewing the Logs generated by different SIEMs (Splunk, HP Logger Trial and the AlienVault platform’s SIEM) I noticed that for some reason quite a few users tend to make the mistake of typing ...
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5answers
2k views

Can sites which check your password as you type pose a security risk?

Some sites that I use check my password as I type it into the login (not registration) form. So, for example, to begin with I might have: Username: sapi ✓ Password: passw × and by the time I've ...
1
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1answer
468 views

Server + Client certificate vs Server certificate + Client password

There are three different ways how TLS (1.2) can be used: server and client authenticate, only the server authenticates or neither authenticates. If neither server nor client authenticates using a ...
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2answers
2k views

openssl_digest vs hash vs hash_hmac? Difference between SALT & HMAC?

openssl_digest vs hash vs hash_hmac I want to use SHA512 for storing password. Which of the above methods are best to use? Why? What is the difference between SALT & HMAC? I just read ...
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3answers
735 views

Websites Forcing Weak Password Standards (Updated) [duplicate]

Please Note: I am not going to name the websites which have these horrible standards for their clients and users. I have had to change my passwords for my routine update just recently in the last ...
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3answers
2k views

Known characters in passwords?

I generate passwords for everything that requires security using the following method: ksoviero@ksoviero-Latitude-E7440:~$ head -c 16 /dev/urandom | base64 gorv/cp+lSiwiEfKck2dVg== 256^16 ...
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2answers
146 views

Password Cracking Mandarin Words English Character Set

I'll be looking to perform a domain password audit in which the user will be using english characters but may be 40% Mandarin speakers so I anticipate a large number of names, phrases, or words that ...
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1answer
717 views

security in banking app with 4 digit pin code and social security number

The new banking app (for norwegian bank Gjensidige bank) for my android handset allows me to log in using only my social security number, and a 4 digit pin code. The social security number in norway ...
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8answers
478 views

Does it take longer to brute force a password starting with z than one starting with a?

I was wondering about the following: If someone tries to get my password with Brute Force, will a password starting with "a" guessed faster than one starting with "z" ? In this case assume the ...
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1answer
322 views

PDF.zip file password forgotten and need to reset [duplicate]

I have an old PDF.zip file that is password secured. Naturally I can't remember it. Is there a way to change it or disable it?
146
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18answers
15k views

What is a good analogy to explain to a layman why passwords should be hashed?

Note: This is not an actual situation I'm currently in. Assume your boss is one of those old-fashioned computer-illiterate managers and wants to store the passwords in plaintext to simplify ...
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5answers
302 views

Secure login feature with low CPU power

I'm developing a program that contains a login function in C++. The problem is that I don't know how to develop it in my situation. I want to run the software on a raspberry pi, it only has a CPU ...
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2answers
343 views

Is it really “Time to add a word” if there are no tools to crack passphrases of 3 words and up?

It's "time to add a word" says Arnold Reinhold, the creator of Diceware, in his blog (3/2014). He advices to use 6 word sentences (or 5 words with one extra character chosen and placed at random) from ...
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2answers
145 views

Database compromised and some passwords cracked

I run an MMORPG game and today while moving from one server to another, apache failed and listed some of the data on the server including a back-up of all the source code + database which a few people ...
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1answer
75 views

Importance of password strength with secure element?

Greetings SE security community. Background: I have a number of items like certificates, databases, and encrypted file systems that require private keys. In order to avoid having duplicates of these ...
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2answers
360 views

Does cPanel store my login password as plaintext

On attempt to change my cPanel password I was warned that: Your password could not be changed because the new password failed with the following reason : (is too similar to the old one), please try ...
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1answer
72 views

Running an Open Server (contents are visible)

I'm considering the possibility of running an Open Server, as I would call it, that is, a server where as much of its contents are publicly visible as possible. I would like to give read access to ...
12
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6answers
1k views

Are password complexity rules counterproductive?

In creating a login for this site I chose a nondictionary password that would be extremely hard to guess, but easy to remember. I was told that it did not meet complexity rules. After several ...
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3answers
91 views

Can I safely use my own statistics to assess password strength on number of times a password is used?

Lets assume I want to give my hypothetic 10mio users userbase a good feedback on their password strength. Besides the classical entropy tests and top500 list of bad passwords, I might want it to be ...
7
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4answers
1k views

Should the password of a password protected channel be hashed?

Let's take a chat system, where any user can create a channel with a password protection. Thus, other users may only join using the channel password. This password is therefore known to every person ...
2
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1answer
116 views

Would it be possible to add additional files to a password protected zip 2.0 file

So the scenario is this: I don't have the ability to determine/recover the master password for a production system that uses zip 2 archives. However, I need to be able to add new files to existing ...
4
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1answer
573 views

PUT vs. POST for password update

I am writing a User Management system that has to include a change of password utility. We don't front end hash passwords (hopefully we will soon). As a result passwords are passed over https in the ...
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0answers
28 views

Is there a repository of credentials used in training materials/samples and SDKs?

Similar to a default password list for network appliances, it's conceivable that application layer passwords are default from training materials given to a developer. In fact, I have discovered ...
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1answer
3k views

Why use an authentication token instead of the username/password per request?

The author of http://stackoverflow.com/a/477578/14731 recommends: DO NOT STORE THE PERSISTENT LOGIN COOKIE (TOKEN) IN YOUR DATABASE, ONLY A HASH OF IT! [...] use strong salted hashing (bcrypt / ...
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2answers
775 views

How secure is the PwdHash algorithm and system?

I use the PwdHash service (http://crypto.stanford.edu/PwdHash/) and plugins for pretty much all of my passwords. I believe this is safer because: No service gets the same password as another, so if ...
3
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1answer
173 views

Is BSI’s process good? (Informing email address owners that their address/password (of unknown/different accounts) was stolen)

The German BSI (Federal Office for Information Security) claims to have got a list of 18 million email addresses and passwords – supposed to be the result of identity theft. They allow to check if ...
4
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1answer
98 views

How to help users manage password portfolios based on risks of compromise?

A framework for modeling password management risks and costs, and the beginnings of a good strategy for users to help them manage passwords for their often large portfolios of accounts is outlined in ...
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3answers
819 views

Time Memory Trade-Off Attacks

Given, we want to crack a password. With Time Memory Trade-Off Attacks one tries to find the right balance between time to compute hashes for all possible passwords. And the used memory to store all ...
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2answers
117 views

How Empathy - a messaging program, is storing my passwords

I am connected to my chat accounts via Empathy, a messaging program, and it has my password stored in it. I am really curious to know how it is storing the passwords, and if there is any they can ...
3
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1answer
100 views

How secure is choosing one out of N generated passwords?

I'm looking to generate some new passwords for myself that are easy to remember, but hard to crack. By choosing a generation algorithm and generating one random password with it, I can be relatively ...
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2answers
127 views

On password change in a web application, should it log users out

When a user is logged into a web-based application in multiple tabs, and changes their password should it automatically log them out of the other tabs? The use case is an account is compromised, the ...
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9answers
3k views

Why do password strength requirements exist?

Password strength is now everything, and they force you to come up with passwords with digits, special characters, upper-case letters and whatnot. Apart from being a usability nightmare (even I as a ...