A set of requirements regarding password creation, storage, and usage. These requirements often constrain several characteristics of passwords. So, a password policy is a set of rules designed to enhance computer security by encouraging users to employ strong passwords and use them properly.

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Use of rainbow tables with the NY Times hack?

The NY Times recently published a story about how they were hacked during a four month period. The hacks allegedly were carried out by part of the Chinese military. One part of the story that ...
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2answers
624 views

How often should passwords change?

I'm asking two very related questions As an admin what policies should be enforced regarding the frequency of password changing? I have an idea that users should be forced to change their ...
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415 views

Is it a good idea to have a “master” password?

Though I do have a good memory of passwords, it is quite impossible to have one password per application. Yet, it should be... My current way to deal with passwords is to have five passwords and to ...
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652 views

password complexity policy for non “English” passwords

In an internationalized application, what is the best practice for a policy on complexity of passwords? I am not having luck searching for the answer. Wikipedia lists these items for password ...
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3answers
688 views

How often should I reset my salt?

I'm thinking of implementing a salt recycling scheme on my user credentials database. The motivation behind this decision is that even if the attacker manages to get his hands on the database and has ...
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553 views

Insecure to require numbers in passwords?

Earlier, I went to a site that required a number and special character, and it got me thinking – wouldn't that make the password easier to brute force? If you assume most passwords have around 12 ...
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344 views

How to refute “don't use internet if you don't like it” answer?

I hope it is legit question, similar to, for example, Why do law-abiding citizens need strong security?, et al. and it is tightly conected with user's security, privacy, etc. The response I always ...
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822 views

Is Username/Display Name Login more secure than email login?

I recently started playing Star Wars: The Old Republic, which for those of you who don't know, is an MMO. Before playing the game, I would always log in with my email/password combo. However, I got an ...
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220 views

Is there any risk in allowing more more failed login attempts before autobanning for a longer time?

By default most software seems to have rather low "burst" settings, like 3 to 5 login attempts before a temporary autoban for a couple minutes. Especially banks have a very low limit before access is ...
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59 views

Should password recommendations be different for devices, networks, and internet?

I started using a password manager last year and updated nearly all of my internet accounts to super-strong, unique passwords, and that isn't a problem, cause I only access them from web browsers or ...
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242 views

How to prove a password guessing theory from Matt Bishop's book “Introduction to Computer Security”

First, this is not a homework problem. This is a problem from Matt Bishop's book "Introduction to Computer Security" which was used as one of the textbooks for a Computer Security class I took last ...
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231 views

Computer team's password change time different from other users?

We need to determine a password policy for our organization. All users, in general, will have 90 days until they will have to change their passwords, complexity required and passwords need to be at ...
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129 views

What implementations are possible for dual control?

An organization requires employees to use 2 person authentication in some scenarios. That is, when accessing, say, a server, secret knowledge from 2 people should be used for authentication. No one ...
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3answers
165 views

Why is password strength often underestimated and uncertain in the context of password hashing?

An aspect of security has bugged me for a long time: Why is there positive certainty about the importance of hashing algorithms and salts, but password strength is either never mentioned at all or ...
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2answers
124 views

Guidance for “image based” password reset challenge

Thycotic has a Password Reset Server that allows the user to select from several images. What general guidance is there for an image-based password reset challenge question? Examples may include ...
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2answers
560 views

Would a massive blacklist of guessable passwords be useful? [duplicate]

Suggestions to make a good password all focus on creating a string that a computer (or more likely, a network of computers with multiple GPUs) can not guess. Putting a password meter for when users ...
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1answer
312 views

How does the mobile security technology APNS and 3LM work?

APNS is an iPhone technology that assists with mobile push. 3LM is a BIOS-level security technology embedded in certain Android phones. I recently got off the phone with Boxtone and they said they ...
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7answers
1k views

Is it possible to detect password length from hash? Does doubling your password add more security?

Assuming a service doesn't store a plain text password, am I right in saying that the answer to this question depends on the service? On a bad service, the hash length is related to the password ...
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4answers
477 views

Is there any explanation (other than storing plaintext) for case-insensitive passwords?

I've come across a few organisations stating that passwords are case-insensitive. Obviously this is ridiculous, and a gigantic red flag from a security point of view. Is there any explanation for why ...
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4answers
408 views

How to tell if a site is securely storing passwords? [closed]

A site I frequent has a policy to make you change your password every 90 days. That's a cool policy, but I stumbled upon an old xkcd and facepalmed myself, because lots of doxing happens on this site. ...
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4answers
166 views

Generate DB Password from license key - a good idea?

There's this web app which has a SQLServer database, and the connection string it uses to access the database is not stored in any configuration file. Rather, the designers decided it would be a good ...
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8answers
423 views

Generate user a password instead of asking for one?

I'm trying to weigh the benefits of not allowing users to create their own passwords, but must pick out of a generated selection. Are there any examples of sites that use this approach? Workflow ...
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5answers
252 views

Is there any good (or less bad) way to handle a web portal or website with awful security?

Background: I'm facing a situation with an online site I must (for the immediate time being) use for financial and HR-related matters that just sucks. In every sense, but security in particular. As ...
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5answers
2k views

Password reset links: random value or authenticated message?

Which is better? Create tamper-proof encrypted password reset token which contains the user id and the expiration time within the encrypted token. Generate a random token and store it in the ...
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2answers
281 views

How can I store a password history to prevent reuse?

I have an application with a user database. The database stores the password using a bcrypt hash with a randomized salt. How can I implement a password history set (to prevent password reuse) in a ...
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2answers
176 views

Doesn't adding requirements to a password, such as must contain 2 digits, decrease the strength? [duplicate]

Possible Duplicate: Doesn’t imposing a minimum password length make the password weaker by reducing the number of possible combinations? Doesn't any constraints added to a password policy ...
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238 views

How does one make password easily forgettable?

Is there any phycological research that appears relevant to making passwords easily forgettable under adverse circumstances? Circumstances might include when under duress, after some duration of ...
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150 views

What exactly is the impact on security when forcing user passwords to contain a particular character?

Some years ago a sysadmin of large computing centre (on a campus) enforced the password of every single user to contain the character $ at an arbitrary position. They soon dropped this policy but I ...
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3answers
337 views

What to do when asked for a weak password

The guys who made the security for my country's state bank are completely nuts in all senses. Their internet banking password must be between 8 and 10 characters, and contain only letters and digits. ...
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4answers
397 views

Best practice for forgot password form, ok to leak that a given e-mail is invalid

On our forgot password reset form, is it ok to leak that a given e-mail address entered is invalid? Or should we always just return success and check your e-mail, even if the e-mail is not valid. I ...
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2answers
225 views

Is there a site like plaintextoffenders.com that shames companies that force insecure passwords?

I recently came across http://plaintextoffenders.com/ and I liked the idea. I wondered if there was a similar site that shames websites that force insecure passwords? I personally have a list of a ...
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219 views

Home “datacenter” security, where and what to look for?

This is a question to learn more about security management and physical security. I'm running a small serverroom in the basement at home, mainly as testbed for attacks I dont want to try on live ...
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2answers
781 views

Why do some websites force users to come up with difficult passwords?

I can't understand why we commonly force users to come up with difficult to remember passwords. * Your password must contain at least one number, one uppercase character, and one special ...
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1answer
486 views

Updated list of bad/overused passwords [closed]

I am building a website, and I'd like to make sure the users don't put an overused password like password or password1.. or any of these Is there a place that constantly analyzes hacked websites ...
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230 views

When changing a password, does it have to be completely different?

When changing a password how important is it to have a significantly different one? For example is it bad to reverse the sequencing of the old password to make a new one or change a few numbers?
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278 views

Same User, Different Access Points, different passwords?

We have a system (e.g. purchasing) where there are multiple access points. One is a back-end desktop application only accessible by employees within the LAN, the other is an Internet accessible Web ...
3
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1answer
641 views

Why do some large companies still store passwords in plain text/decrypt-able format? [closed]

In the last couple of weeks I've come across two fairly large companies who seem to not have stringent password security: Tesco - they store passwords in an "encrypted" format, yet they can decrypt ...
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3answers
161 views

In what situations are web services required to protect confidentiality of user information?

I know that if a web application needs to be PCI-DSS or HIPAA compliant the user personal identifiable information (e.g. user password, etc) needs to be kept confidential. Under what other situations ...
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1answer
440 views

Best security algorith for storing passwords [duplicate]

Possible Duplicate: Which password hashing method should I use? I want the best cryptography algorithm for storing passwords in database, which one should I use and how can I implement ...
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1answer
222 views

Is a One Time Password Scheme based on Diceware viable and secure?

I recently learned about diceware and was thinking about how it could possibly be used to create a one time password scheme. I'm thinking S/KEY is probably more appropriate, but would a system that ...
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243 views

Similar passwords can't be used again. A sign of unhashed password storage? [duplicate]

In my school everyone must change their password every six months. The new passwords cannot be the exact same as the old one, this make sense, however many of my peers often complain that they need ...
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4answers
411 views

Should user's password strength be assessed at client or at server side?

Now most of big website like Google mail, Twitter, Facebook have a feature that assesses password strength (check number of digit, alphabet, special characters, or check the similarity over already ...
2
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3answers
181 views

Where did common “minimum password length” guidelines originate?

Not long ago, the common wisdom was that passwords should be at least 8 characters long. These days, the most common minimum is 12. Where did these common values originate? Interestingly, 8 is ...
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3answers
131 views

How to make an outbound request to users to update their passwords?

Clearly it works best if the request to update a password happens as a response to an inbound request to access a known system, but how do you make an outbound request to users to update their ...
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5answers
288 views

Is accepting old passwords a bad policy?

This question is inspired by an experience I had today with online banking, as follows. One year ago I opened an online deposit account. (Without naming the bank, I will say the company is currently a ...
2
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3answers
338 views

Account lockout with human interaction required to unlock

I just got locked out yet again from my university's system for typing the wrong password twice, then mistyping the correct one by accident. Now I have to call the helpdesk or go there myself to reset ...
2
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3answers
234 views

At what point is password complexity “safe enough”

Obviously the best passwords will be highly complex randomly generated passwords stored in a password vault. For the average user though, this might be a slight overkill. Assuming that the average ...
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6answers
919 views

Does Username + Password + Pin improve login security?

I've been asked to add a feature to a website to require a pin for users. The site currently uses username and password. If a user wants to change their password they need to supply the current ...
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2answers
231 views

Too many passwords?

Is it necessary to have hard drive and bios passwords if you also have full disk encryption, or maybe at least the hard drive password is unnecessary because there would be two passwords protecting ...
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1answer
70 views

How could someone change a root password without modifying `chage -l root` date?

How could someone change the root password without changing chage -l root Last password change date? I know it was changed because it does not match the value in Keepass. I noticed when I tried to use ...