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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3answers
596 views

Is it inconsistent to tell users to “not click on password links in email”, and requiring clicks on “forgot password” links?

On one hand, IT Security shops have been telling users to not click on links in email because they can do damage to your computer, or phish your personal information. Many of those issues are ...
11
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4answers
2k views

Why will Google no longer allow me to end or begin passwords with a space? [closed]

Why won't Google allow me to use a password ending in a space anymore? Backstory: I have memorized a cipher that allows me to generate a different and very strong password across many different ...
11
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2answers
1k views

Requiring regular password change but storing previous paswords?

My bank requires me to change my password regularly but then they can detect if my password was used before. They probably store the old password (possibly hashed) in order to detect it. I think this ...
11
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4answers
1k views

Does it indicate a bad password system to disallow certain characters in passwords?

When creating an account to the game League of Legends, the user's password must comply to a few rules. The one I'm concerned about is the "Must not contain slashes or spaces" one. The others are ...
11
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2answers
2k views

Password auditing

Most password policies require the password to be at least 8 characters long and contain symbols from at least 3 classes (lower case letters, upper case letters, numbers, other). Problem is, that a ...
11
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4answers
684 views

What is the best way to hand out passwords to a widely spread diverse employee base?

I have a problem I need to solve - specifically, how to hand out passwords to people in a variety of locations, and with a wide variety of access. I've thought of some options, but there are ...
11
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3answers
139 views

Reason to ban digits as first character in passwords?

When I sigend up for a service by DHL (German parcel delivery service), they had the strangest password guideline I have seen so far: At least 8 characters but no more than 13. Only usage of “valid” ...
10
votes
5answers
13k views

Regulations that specify password length?

I have read: PCI DSS 1.2 SOX 404 AR 25-2 ISO 27001 But only PCI DSS specifies a minimum password length. Are there any other regulations that dictate password lengths for any industry? NIST ...
10
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11answers
4k views

How to easily remember lots of different passwords?

I know that you shouldn’t use the same password on every site. But, when you log into several dozen sites, keeping track of all the passwords can be pretty hard. What system do you recommend that won’...
10
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3answers
1k views

Logging “password with counter” use

When prompted to update their passwords after they've become stale (whether that's after 30, 60, 90 days — whatever is implemented by policy), many users simply increment the number that they may have ...
10
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2answers
1k views

How can I find out the password hashing schemes used by the specific Unix accounts I log in to?

Every day I ssh in to 3 or 4 independent Unix accounts. I have been regarding them as more or less "equivalently secure" on the grounds that I'm using ssh, but after learning of how much variety ...
10
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3answers
2k views

Requirement to send username and password in distinct email messages

I have an application that sends username and a password by email (random temporary password, mandatory change on first login). A big customer has this policy of "never send username and password in ...
10
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3answers
1k views

An authoritative source for why you should NEVER give your password to anyone?

I know this might be a bit subjective, but it's based on this popular question here. Hopefully this is acceptable. The problem with that question and answer is that I can't send it to my boss and ...
10
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3answers
452 views

Is there any conceivable reason to prevent a password change in an authentication system?

I connect to the VPN of another company with a company-specific username and password (they aren't giving everyone the same password to every company to access it or anything ridiculous like that.) ...
10
votes
2answers
2k views

Are the SS64.com password generators a good approach?

There are two password generators on ss64.com: The standard one The strong one How they work I made standalone versions of them, plus copy of the original HTML/Javascript versions, if you want to ...
10
votes
3answers
664 views

How can I promote good password practices in an organization that doesn't currently care about that?

I work with an organization that uses some very poor practices such as using default user accounts, default passwords (or passwords the same as user accounts), sharing password information between ...
9
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7answers
2k views

How to securely counter users from adding a single digit to their old password upon creating a new one? [duplicate]

Let's say that in the password policy the password history is defined to remember the last 10 passwords. I understand password history exists so that if a password is recovered from a compromised ...
9
votes
3answers
2k 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 ...
9
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2answers
753 views

Banning specific passwords?

There have been a couple of questions about enforcing good passwords, so I thought I'd add my own: In addition to enforcing a minimum Shannon entropy, would it generally be a good practice to ...
9
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2answers
292 views

How to create dictionary to prevent weak passwords?

I've been tasked with adding a "dictionary check" against user's passwords to prevent weak passwords. Unfortunately, that is about as much guidance as I've been given and I need some help deciphering ...
9
votes
3answers
832 views

An alternative to traditional passwords: is there some merit to this idea?

If you've got a website aimed at people that are not necessarily technically proficient, letting new users choose their own password isn't very secure because of the simple fact that a lot of people ...
8
votes
4answers
861 views

Doesn't imposing a minimum password length make the password weaker by reducing the number of possible combinations?

I thought the strength of a password depended on the total number of possible combinations. Therefore, allowing longer passwords should be safer because you then have more possibilities. But why do ...
8
votes
8answers
2k views

Sequential password updates

Let's say I have a reasonable KDF, and that I make users change their passwords periodically and keep some old password hashes to prevent password reuse. What's to stop the user from changing the ...
8
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7answers
976 views

How can I prevent users from using bad passwords in my web application?

There is a long discussion on whether it's the responsibility of the user or the system administrator to deal with the strength of the password. Obviously, the password is a very private thing, but ...
8
votes
5answers
3k views

Is forcing users to change passwords useful?

In many places, there's a policy that force the user changing it's password once a few months. The logic here is, that even if the password have leaked somehow, it'll be abused only for a relatively ...
8
votes
3answers
1k 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 ...
8
votes
4answers
370 views

Is autocorrecting typos in passwords secure?

Technology Review's Why Autocorrect for Passwords is a Great Idea says: New research shows those frustrations could be avoided using the same approach used to fix typos in text messages and ...
8
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4answers
3k 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 policy:...
8
votes
5answers
713 views

Are we concentrating too much on password complexity?

As a developer and/or user, do I really need to worry about password strength if the system does not allow brute force attack to be feasible (implements a delay or attempt counter) or implements a two-...
8
votes
4answers
119 views

Secure Memorable Passwords for Older Users

As with many people who work in IT I have found myself in the position of providing technical support for older relatives. Most of these relatives are not technically savvy and hate the idea of ...
8
votes
2answers
142 views

How can I enforce strong password policy with non-technical user base?

I've been using zxcvbn to enforce strong passwords for a service where break-ins would cause considerable problems. However, the service is only viable if many users sign up. We've found that users ...
7
votes
2answers
403 views

Is it a security risk to remind users of the password requirements at login?

I regularly find myself trying to login to websites where I don't remember the password I use. I make some guesses as to what I might have used but usually wind up having to reset it. One thing that ...
7
votes
3answers
751 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 ...
6
votes
3answers
1k 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 ...
6
votes
3answers
582 views

Does it make any sense to alter a hashed password? [duplicate]

I've always wondered if it would make any sense to put fake characters into a hashed password? For example this is my password: 1234 and after hashing the password , this is the result: abcd Then ...
6
votes
6answers
5k views

Does having a minimum number of digits improve password security?

Some password systems will enforce at least X of a type of character - a common one I see is 'minimum 3 numeric characters'. As far as I understand, simply allowing certain character classes, like ...
6
votes
3answers
2k 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 ...
6
votes
2answers
556 views

What does “Change your password everywhere else” e-mail from compromised service mean?

I've recieved an e-mail from ubuntuforums.org a couple of hours ago: [...] the attacker has gained access to read your username, email address and an encrypted copy of your password from the forum ...
6
votes
2answers
435 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 ...
6
votes
3answers
1k views

Do you think it's a good policy to disclose your password encryption method to users? [closed]

Do you think it’s a good idea to disclose your password encryption policies in your privacy policy or terms of service agreement? In other words, would you tell your users - and the world - you don’t ...
6
votes
3answers
434 views

Does prompting for security questions on new computers add any security on banking websites?

When you sign into Bank of America on a computer you haven't used with them before, the site prompts you to answer one of your security questions. How exactly does this make the site more secure? ...
6
votes
1answer
96 views

First X characters of your password cannot be identical to your previous one

The security policy at my employer has a password rotation policy for my workstation. Upon a recent change of password I immediately received an email telling me of an issue: According to our ...
5
votes
7answers
5k views

Pronounceable Password Generator

I am currently looking for a password generator which produces pronounceable passwords. I have used this random password generator a few years ago to generate a 42 characters long password and found ...
5
votes
3answers
10k views

What do I need to do to secure log-in and registration for my website?

What security features do I need to have in-place to ensure that my website log-in and registration forms are secure?
5
votes
4answers
446 views

How to check for duplicate passwords?

Is it possible to check if like 100 people are using the same pasword? without risking anyones password getting out? I heard that Google does this, not allowing the user to set a password 1000 people ...
5
votes
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 ?
5
votes
4answers
2k 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 ...
5
votes
5answers
6k 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 ...
5
votes
3answers
413 views

How secure is this method to remember security questions?

So I found an interesting method of remembering those pesky security questions. Basically, the guy takes a hash of the question (IE what is your mother's maiden name?) and then appends his own ...
5
votes
3answers
608 views

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 ...