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

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What is the most secure way to recover password online? [duplicate]

Possible Duplicate: Can anyone provide references for implementing web application self password reset mechanisms properly? I have website which sends generated password to any person who ...
28
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4answers
7k views

Why is using salt more secure?

Storing the hash of users' passwords, e.g. in a database, is insecure since human passwords are vulnerable to dictionary attacks. Everyone suggests that this is mitigated via the use of salts, but the ...
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7answers
3k views

“Real” Salt and “Fake” Salt

During a Q&A period at DEFCON this year, one member of the audience mentioned that we're using "fake salt" when concatenating a random value and a password before hashing. He defined "real salt" ...
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1answer
1k views

Would it make sense to use Bcrypt and PBKDF2 together?

I've read various opinions about whether Bcrypt or PDBKF2 is a better key derivation hashing method. The answer seems to depend on a lot of complicated factors that are not easy to analyze. Would ...
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3answers
2k views

What is a good enough salt for a SaltedHash?

Since I'm hashing all passwords with each their own salt, is there a benefit to the salt being really random, or would an incremental counter or a guid be good enough? Also, is there a benefit of ...
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1answer
671 views

website hacked and all its content erased despite the protections

i was hacked by a guy who erased everything. I spent the day to put everything in order, and i would like to find a solution for this : he erased all the files, and also changed the title for "www" in ...
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1answer
4k 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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2answers
551 views

Hash, encryption of file… key? Need help [closed]

So my previous question was with some help on pcap files as I am doing a security course and we have a challenge to figure out what was going on in our network. Now one of the files I retrieved is an ...
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3answers
303 views

Password security : complexity and length [duplicate]

Possible Duplicate: XKCD #936: Short complex password, or long dictionary passphrase? I've read that there is many solutions available to crack passwords. Reading these tips, I can understand ...
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1answer
662 views

What encryption hash function I should use for password securing? [duplicate]

Possible Duplicate: How to securely hash passwords? What is the best encryption algorithm? MD5, SHA1, SHA2 or maybe something else? Can you explain me why?
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3answers
310 views

Does this kind of hashing exist?

Let's say you have two user defined strings, X, Y and you want to hash them into the hash Z. That is what most websites would do, X is the user's password and Y is the salt. It takes a lot of time to ...
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4answers
719 views

How should I tell an organisation that they are vulnerable when I wasn't given permission to check?

I was recently at a village hall (in the UK), some distance from where I live, for a party. I noticed that they had unsecured wi-fi with an SSID of NETGEAR. I assumed it was free wi-fi for users of ...
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3answers
520 views

Is it advisable to have a web browser remember login credentials?

I have a really long random password for my cellphone account and have it written down in a safe place. I only use it once a month and am considering having my browser remember it. Would there be any ...
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4answers
533 views

Are there vunerabilities with this authentication mechanism?

I am trying to come up with a way to implement token-based authentication for a REST API without the need for SSL. The goal here is to avoid sending any sensitive information across the wire. I was ...
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2answers
2k views

Long Passwords: How are they more secure? [duplicate]

Possible Duplicate: XKCD #936: Short complex password, or long dictionary passphrase? How are long passwords more secure? The only situation in which I can accept long passwords are more ...
7
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2answers
6k views

How expensive is it to guess a 15 character password, and should I be worried?

I'm currently using AES encryption (at home) on GNU/Linux (one of LUKS AES-256 variants with xts) and on Windows 7 (Truecrypt) with a 15 characters password (alphanumeric lowercase only plus _). ...
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5answers
2k views

What password cracking software is commonly used?

I am curious to know how secure my passwords are. What password cracking software is commonly used? Preferably open source. EDIT: I am actually looking to crack my passwords used on services I don'...
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2answers
6k views

Pre-hash password before applying bcrypt to avoid restricting password length

Good practice is not to unnecessarily restrict password length, so that appropriately-long passphrases (perhaps 35-45 chars for 6/7 dicewords) can be used. (See e.g. Should I have a maximum password ...
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4answers
3k views

Send new password by email is bad practice but what to do if user forgot his password?

According to http://plaintextoffenders.com/post/7006690494/whats-so-wrong-about-sending-a-new-password-in it's bad so what to do ? Just ask him to set a new one ?
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3answers
2k views

Why would you do a password audit

I was thinking last night after reading an article about pen testing and security audits, why would you get a list of all the passwords for the company you are auditing and put them through a piece of ...
3
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3answers
606 views

What pros and cons are there to a one-time random salt between client and server?

In researching on best practices in hashing passwords using a salt I came across a presentation on slideshare. The approach outlined is as follows Client requests login page Server-side code ...
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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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5answers
422 views

Tool to grab sensitive information from command lines [closed]

Of the information entered on the command line (command name and arguments) have to be considered public (everyone can access it using commands like ps). Is there a known tool to automate this kind ...
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6answers
2k views

Online password managers

Can online password managers be used for storing and managing passwords? I mean from the security point of view. I understand that those systems can be different and some deserves more trust than the ...
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1answer
1k views

What's the idea behind requiring users to change password periodically? [duplicate]

Possible Duplicate: How does changing your password every 90 days increase security? Some sites require users to change their password every x days. For example, at least 3 online banking ...
4
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1answer
982 views

Reasonable (BruteForce) Attempts/Second Estimate?

I've read various articles on password strength and passwords vs pass phrases (including the one from XKCD and its thread here), but most of those articles seem to be focused on online passwords, and ...
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1answer
3k views

Which cross-platform password managers support encryption using a hardware token?

I am looking for a really secure password manager and I really like the fact that Password Safe supports encryption/decryption using a Yubikey programmed in challenge-response mode. Read more here: ...
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8answers
5k views

Is it safe to use leakedin.org?

leakedin.org claims to offer a service checking if your LinkedIn password has been stolen and whether it has been cracked. The website claims that it's pure Javascript, that is your password won't ...
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3answers
16k views

Database field type for password storage?

In the past I used varchar(255) for storing hashed passwords (no salt). Is this still enough? Or are longer fields required?
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4answers
67 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 ...
6
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3answers
416 views

Is my sons' school portal in violation of any Password/UserID rules?

My sons' school sends both ID and PW for a portal through USPS at various times during the year, (e.g. class registration) whether I need it or not. If I change the password, it sends a confirmation ...
2
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3answers
517 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
177 views

Are there any academic articles on how people handle their passwords?

Are there any academic articles on how people handle their passwords - how many they use in total, how often they change it, whether they commonly store it somewhere or just remember them and so forth?...
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1answer
398 views

For what malicious activity can one use a computer with a high-end GPU?

I'm currently researching what malicious activities can one do with a computer containing a high-end GPU. So far the only uses I found were Bitcoin mining and password cracking. Are there any other ...
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6answers
1k views

Is putting every username and password for our organization in a giant Google spreadsheet a spectacularly bad idea?

Our startup has something like 100 usernames and passwords to keep track of, and we can't keep track of all of them. Would putting all of them in a Google spreadsheet shared amongst ourselves be a ...
8
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0answers
86 views

What do studies show are best practices for password expiration policies? [duplicate]

Possible Duplicate: How does changing your password every 90 days increase security? What are best practices for password expiration policies? There are some questions that already address ...
6
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1answer
5k views

Is BCrypt enough when saving a password into a database?

In order to allow users to connect to my website, I encrypt their password using BCrypt since it is one of the slowest algorithms to decrypt (making a compromised database longer to be decrypted). ...
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2answers
347 views

Are more passwords breached via dictionary/bf attacks or via packet-sniffers/key-loggers?

This question has always intrigued me whenever the subject of passwords is brought up. Does anyone have direct experience or a reputable source to answer what percentage of password breaches are ...
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1answer
579 views

Academic papers on GPU password cracking?

Are there any scientific papers or publications on GPU password cracking?
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1answer
875 views

How to download PHI PDF from a secure website to a secure, encrypted folder on Windows 7?

Objective: HIPAA compliance. Here is the process: Receive PDF File through secure website Open the PDF (Which involves downloading to some folder) No longer need PDF The Question: Is there any ...
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1answer
201 views

Stripping / appending characters from user password before hashing to conceal it forever?

I had this idea to permanently conceal user password by requiring minimum length then stripping certain characters. For example if the user password is secret123, the system will strip it down to ...
4
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2answers
834 views

Can key files be brute-forced like passwords?

Let's say you use a program like Truecrypt or Keepass which allows you to have a password + key file. I understand that passwords can be brute-forced/dictionary-attacked but is the same true for key ...
18
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3answers
9k views

Password in file .php

My connection.php file stores the credentials to connect to the database. <?php $objConnect = mysql_connect("localhost","username","password"); mysql_select_db("selectDB", $objConnect); ?...
8
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4answers
420 views

Will passphrases always be secure?

In a world where most people used passphrases instead of passwords, wouldn't an attack that generates a random string of words (alternating between word delimiters) be similarly effective to a brute ...
2
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2answers
739 views

Using a tabula recta to store passwords

Reading an answer to another question ("Is there a method of generating site-specific passwords which can be executed in my own head?") I came across this link, describing a way to use a physical ...
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4answers
172 views

pesudo random password

I post a question before about one password repeating to make it longer, now its a new way want to ask about, if take the word 'secure' and instead of repeating it put somenumbers between it, exp: ...
8
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3answers
3k views

Can ssh keyfile security be broken in a few hours if the file is exposed?

At this link there is a claim that if an RSA key has a strong passphrase security might be broken in a few hours if an attacker has the private key. Is there something weak about the security of RSA ...
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11answers
6k views

Best practice for password distribution

I am about to set up a new account on my Linux server for a user that lives in another state in the U.S. I can't think of a good way to get them this user their password. There must be a standard ...
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1answer
289 views

Securing communication

The problem: I have an open-source client (a Firefox add-on written in JavaScript) and a server containing somewhat sensible user information: username and user history (all from YouTube). The client ...
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4answers
6k views

How to implement a “Remember me” on a mobile app?

I would like to implement a "Remember Me" time-limited auto-login type feature on a mobile application (on Android). To start the app, the user must type in a username and password. For convenience, ...