Linked Questions

10
votes
4answers
1k views

Is using a flash drive as a base for security a safe thing to do?

I'm developing some software for schools. I've found severe flaws with the current popular school LAN protection that I feel needs fixing so I plan on releasing my own software. One the those ...
6
votes
4answers
1k views

Why change password? [duplicate]

Why are there recommendations to change passwords with certain intervals? If I have a good password, e.g. a long wrongspelled odd sentence with a couple of special characters thrown in, why is the ...
2
votes
4answers
460 views

Why should we protect access to password hashes?

Why should we protect the access to the password hashes? And under what conditions can this precaution be omitted?
23
votes
3answers
6k views

Why do password creation/login screens hide the typed password?

I realize that the concept behind obscuring a password on a screen is to prevent someone "shoulder surfing" behind a user and seeing the typed in password. As a fairly good typist I have no problems ...
15
votes
3answers
4k 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 password ...
11
votes
3answers
1k views

Do (uncompromised) passwords ever need changing, if I use a password manager?

For instance, my Google account has a 32-character, random character password that I maintain with LastPass. I regularly flash new ROMs on my phone or otherwise need to be able to manually type in my ...
8
votes
3answers
3k views

I found my user details on already old, leaked account information list

I came across an old (>3 years) accounts information list which has been leaked to the web. The list included thousands (>10.000) of account details from a service or services. Apparently the event ...
5
votes
3answers
2k views

Password strength metrics

In the question Source code as password I suggested using a combination of entropy and as @Lawtonfogle put it 'meatspace difficulty'. As suggested in the xkcd comic correct staple horse battery is a ...
4
votes
3answers
3k views

Why require new users to change password?

I have noticed that it is common practice when setting up a user account (Windows users accounts and Google Apps user accounts in my case) to require new users to create their own password immediately ...
0
votes
3answers
1k views

Testing a password for similarity to previous hashes

This question is a follow-up to a comment by Tobias Kienzler to an answer to "What is the purpose of the “Password minimum age” setting?". Consider a password policy that new passwords cannot be ...
28
votes
2answers
4k views

Does password expiry provide any benefit at all (when using randomly generated passwords)?

I have been seeing a shift in password policy, this has been going on for a while (Article from 2017) but I have only just picked up on this. In my organization we expire the user passwords every 90 ...
12
votes
2answers
7k views

After How Much Data Encryption (AES-256) we should change key?

Considering AES-256 encryption, what is the maximum amount of data should be encrypted with one key? Does Block cipher modes/IV/counters also governs the limit? If say the maximum amount is 50GB, ...
12
votes
2answers
2k views

Requiring regular password change but storing previous passwords?

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 ...
8
votes
2answers
11k views

Password expiration and compliance (ISO, NIST, PCI, etc)

I'm quite confused about what is the current state in 2017 for the idea of password expiration/rotation especially related to security certifications as ISO, PCI, etc. I keep reading that password ...
4
votes
2answers
310 views

Storing Old Passwords. Bad Security [duplicate]

I have client who is adamant they want to store the last 4 used passwords for every user and force each user to change their password every 6 months to something not used before (i.e not in the last 4 ...
3
votes
2answers
145 views

Assuming proper creation, encryption, and storage, how is a breach/leak of a hash worriesome?

Let's say I create a pseudo-random password that is secure (24 alhpa numeric, upper lower, special chars...) for a system (say a password manager). Let's assume the password manager encrypts and ...
2
votes
2answers
189 views

Should Administrators regularly change their passwords

CESG state that users should not be forced to undergo regular password changes as it often harms, rather than improves security. Does this logic apply to administrators as well, such as domain admins? ...
2
votes
2answers
802 views

What impact do the frequency of password resets have on password reuse?

Wondering if there's any research behind the most common password reset cycle I've seen of 90-days, and if there's any research that gives any insight into how to optimize password resets to reduce ...
1
vote
2answers
92 views

Can we simply re-salt password on suspected session hijack?

Looking at people complaining about Yahoo forcing users to change their passwords. We can see that people do not particularly like to change passwords (and whether we change them regularly is an ...
0
votes
2answers
141 views

Is there any real security benefit to forced password change intervals? [duplicate]

This question is quite basic, but it bugs me and I'm sure it bugs a lot of other people as well. What is the real security benefit to forcing users to change their password say every 60 days or every ...
4
votes
1answer
294 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 ...
2
votes
1answer
9k views

Best way to encrypt data using php - I am not sure if I doing it correctly [duplicate]

I want to encrypt some data within my php file when I add the stuff to my mysql database. This is how I do it. I create a static key like: $key = md5("pass"); Then I have two functions called ...
1
vote
1answer
1k views

Should cookies expire?

Let's say I have an account on a blog. I'm using https on every single page of that blog through web server rules, so there's no way to visit the page in the clear text. I'm also using a laptop that ...
0
votes
1answer
133 views

Requiring regular password change counterproductive [duplicate]

According to http://www.csoonline.com/article/3195181/data-protection/vendors-approve-of-nist-password-draft.html "There have been multiple studies that have shown requiring frequent password ...
0
votes
1answer
214 views

email on hosting company's site hacked?

I have a friend who's has a site hosted by a company in the states. They think that someone has gotten access to their email account because any requests for support submitted via their website ...
0
votes
1answer
2k 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 system ...
9
votes
0answers
279 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 this ...
3
votes
0answers
725 views

Are enterprises Office 365 accounts overly exposed to brute force attacks?

Earlier this year the Scottish parliament was attacked by what described as a “Brute Force” cyber-attack. It was said that the attack targeted “MSPs and staff with parliamentary email addresses”. ...
3
votes
0answers
283 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 ...
1
vote
0answers
85 views

password aging, advantages and disadvantages [duplicate]

What is the advantages and disadvantages of password aging? Should we apply password aging policies? Thanks a lot.

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