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

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3
votes
2answers
211 views

Is there known statistics of passwords used during brute force password attacks?

I have been reading quite a bit about brute force attacks and I am wondering whether the passwords that are used in such attacks should be kept around so as to later prevent my users from having those ...
9
votes
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 ...
28
votes
2answers
3k views

Is it possible for my password to have more than one password combination?

Can my password have more than one password combination? I read up on physical combination locks (the lock you open with numbers) and I learned that a combination lock can have about 40 or more ...
1
vote
1answer
264 views

Windows passwords: Blank/non-blank, admin/non-admin

What are the security concerns of the following user account setups on a normal Windows 7/8/10 desktop machine compared to: Using a non-privileged account with a password and having an admin account ...
2
votes
3answers
463 views

Why PHP password_hash does use blowfish intstead threefish?

I was wondering why PHP's hash_password function use blowfish instead of threefish. According to Bruce Schneider blowfish is outdated and He is recommending twofish or threefish. Is blowfish enough ...
5
votes
1answer
126 views

How to implement a password change policy when user's centralized password is in a lot of places?

I would like to implement password changing in an organization but they have the domain controller/LDAP passwords "all over the place". They have the passwords in a lot of places, for example, in ...
1
vote
1answer
53 views

Is Windows 10 [Password protection on wakeup] set to 'Required' relevant when machine is asleep?

I like to just hit the spacebar and have the machine ready without the extra fuss (many times a day.) No one untrusted has physical access to the machine, but it wakes up at ~3am and does updates and ...
-2
votes
1answer
77 views

How can you set a wireless router password that nobody (including yourself) knows? [closed]

Consider the following hypothetical situation: On a Macbook, A hacker can view the screen of your machine (and may have a keylogger installed). It is impossible to remove them even by reinstalling ...
10
votes
1answer
674 views

Is disabling sudo password prompt a security risk?

I was reading the this question over on Ask Ubuntu and they suggest adding the following line to etc/sudoers so that you're not prompted to enter your password each time you run sudo %admin ALL=(ALL)...
14
votes
2answers
15k views

How can I find if my password has been posted online?

I have just received this email from AbeBooks.com: Hello AbeBooks Customer, This is an important message from AbeBooks.com. As part of our routine security monitoring, we have learned ...
4
votes
2answers
240 views

Storing server generated passwords

There are some applications that generate passwords for you. Consider a case where you sign in via Facebook, the application (let's call it NEWAPP) verifies your sign in on the server using FB tokens ...
1
vote
1answer
72 views

Storing credentials for desktop app

I have desktop application written in C# with three user roles and some predefined users. It is also possible to create another users or change passwords to predefined users. App has to work offline ...
5
votes
3answers
170 views

How to mitigate heartbleed like attacks prior to zero day

Whenever sensitive data such as a password is used on a server it resides in memory for a short time. Given that security flaws like heartbleed exist which have the ability to 'bleed' memory for their ...
400
votes
5answers
139k views

Do any security experts recommend bcrypt for password storage?

On the surface bcrypt, an 11 year old security algorithm designed for hashing passwords by Niels Provos and David Mazieres, which is based on the initialization function used in the NIST approved ...
23
votes
4answers
5k views

Why did Richard Stallman recommend not to use passwords for wireless networks? [closed]

In a short interview, Richard Stallman recommends not to put passwords on your wireless network. In the OS Revolution documentary he also mentions how he's disliked passwords ever since his job at MIT ...
1
vote
0answers
37 views

Under what conditions does Safari have access to the Keychain?

The Keychain is shared among many different apple products and includes asymmetric, symmetric, and other types of security data. People who use iCloud, and also enable the keychain synchronization ...
16
votes
7answers
7k views

My IP address (with a NAS) is targeted by a hacker. What to do? Should I be worried?

I've noticed, based on the logging of my NAS, that my IP address is targeted by a hacker. I already took action by automaticly ban the IP address permanently after five unsuccesful login attemps. ...
1
vote
1answer
148 views

Copy-and-pasting plaintext data from encrypted container

Suppose we have sensitive information stored in plaintext within a dm-crypt/VeraCrypt encrypted file and this information is copy-and-pasted by a user into a web browser after decrypting (this could ...
12
votes
2answers
3k views

Benefits and drawbacks of giving an Administrator two accounts for elevated rights and another for daily use, such as email

Microsoft has long promoted the need to separate administrative accounts from regular use accounts, as shown with this guidance MSFT even went to far as create ADMINSDUser rights to put ...
1
vote
1answer
321 views

custom input format for hashcat

I am doing a password strength audit (I have permission). I'm using Hashcat. It supports formats like sha-256(password.salt) and sha-256(salt.password) but my hashes are generated by sha-256(username+...
-2
votes
1answer
76 views

Password complexity policy and practicality [closed]

If you are a user and your company implements a password policy that says your password must have at least 8 characters, at least 1 number, at least one alphabet and at least 1 special character, ...
0
votes
2answers
280 views

Is this hash function safe?

Below is the hash function implementation of the roguewave library. It returns a 32 bit hash. The core operation is A = B ^ ((C << 5) | (C >> 27)). Is this hash safe to use as a password check ...
31
votes
8answers
5k views

Do non-keyboard characters make my password less susceptible to brute forcing?

I can put characters in my password for which there are no keys on a keyboard. On Windows, Alt+#### (with the numpad) inserts the character for whatever code you type in. When I put this in a ...
6
votes
4answers
773 views

Can't brute force password cracking somehow be throttled?

Online articles mention the importance of a strong password and suggest that hacking tools allows bad guys to attempt millions of passwords per second. I am wondering why OSes and websites and such ...
-1
votes
2answers
57 views

What could be a suitable solution to single factor authorization worksheet bank password circulation with no control?

Passwords for various banks are written in an excel sheet and this excel sheet is password protected. However, there is no control on circulation of this sheet, for many banks only single factor ...
5
votes
1answer
210 views

Router sends password plaintext: is this a serious vulnerability?

Today I went to go & reset my router, but forgot the account password for the ISP. On the (extremely) off-chance of the password being present in the 'Password' field, I went to the appropriate ...
3
votes
1answer
79 views

Security problems with password-less SSH

Is there any downside of configuring password-less SSH authentication? Although it is very handy and secure, if someone gets access to my system with my account and there is password-less ...
4
votes
1answer
1k views

How to read the key3.db file?

The file key3.db contains the key that is used to encrypt the Firefox passwords stored in logins.json file. I don't use master password in Firefox, but according to this article, my passwords are ...
22
votes
1answer
1k views

How does Firefox encrypt passwords without selecting Master Password?

I know that the file logins.json contains all my encrypted passwords in Firefox browser. How does Firefox encrypt these passwords if I don't use the 'Master Password' option? Does this mean key3.db ...
48
votes
5answers
9k views

How can I know that developers will be ethical and not record my password in plaintext

I am not asking why hashing should be done. Instead, I want to know how to prevent that developers record user passwords to hack their user's other accounts, especially their email. Couldn't they ...
1
vote
1answer
88 views

Is it secure to allow an account to use `test123!` as their password?

I'm working on tightening up security for the auth layer of my app and I'm currently making a call on the complexity I'll require for passwords. Is there a 'standard' recommendation for complexity? ...
5
votes
1answer
606 views

Is it bad to add a guessable password to a random password?

Let's say a person has a password they used before they knew about how to make good passwords, like peter123. Let's also say that when they were thinking of a better password, they found they could ...
76
votes
14answers
8k views

How to store passwords written on a physical notebook?

Answers to the question "How safe are password managers like LastPass?" suggest that storing personal passwords on a physical notebook might be a reasonable option: I know someone who won't use ...
0
votes
0answers
145 views

Generate password list with specific keywords and length

I need to generate a list of passwords to try penetrating into a wi-fi network. I have a pretty big list of keywords and I want to use them to generate as many possible passwords as possible, which ...
44
votes
4answers
7k views

Is it good practice to ban an IP address if too many login attempts are made from it?

Since an IP address does not necessarily represent a specific device, but probably a whole network/company/etc. does it at all make sense to block an IP address if there is a significant amount of ...
0
votes
1answer
82 views

Could there be any implementations where the pw is truncated after “space”

A good human memorable password could be: My 1st passw%%%%%!!!!!rd But could there be any password storing implementations that cut off the password after the first space, so the password will be ...
27
votes
8answers
3k views

Best way to administer all my passwords

I am trying to figure out what the best solution is to store different types of passwords: Personal passwords (my personal email, my company's email, all the services I use to buy things like ...
1
vote
1answer
47 views

Is there a PAKE algorithm where the passwords can be tested in the first round?

I want to use PAKE for key exchange between two parties (Alice and Bob) which share a low entropy secret (a password they exchanged on a piece of papers). Alice and Bob use a software on there ...
6
votes
1answer
199 views

Password security when connecting to ldap with rails application

How do you store a username/password securely in a rails app when using it for many ldap searches? The connection in the app requires ldap_bind_authenticate(Net::LDAP.new, username, password) ...
2
votes
2answers
198 views

Why are there places that still advises to use complex-only passwords? [closed]

Why are there organizations, websites that still, in 2015 advises that people should use complex, at least 8 character long passwords? Why doesn't they advise to use password-managers, long ...
9
votes
6answers
36k views

Modern high quality password dictionary

Has anyone come across any good password dictionary lately? Some of the lists I found dated back to 90's! Some are simply too big that I doubt their quality. There appears to be some work by someone ...
5
votes
1answer
126 views

Fido: trusting user-agent

As I went through Fido specifications: the server (providing web app/services) need to trust user agent for local fido authentication and if needed can enforce certain policies" I am not sure ...
2
votes
0answers
71 views

Creating New Acc in Mac Mail 1st Connect to Server not SSL is uname & pw tx secure?

It appears that whenever you set up a new mail account on Mac Mail on OS X (or iPhone, iPad etc), that as soon as you enter the server and the mail account user name and password, Mac Apple-Mail tries ...
4
votes
3answers
155 views

Is there more to consider than just keyspace when determining a password's strength?

Please consider the following passwords: CO/l37)[Ou It contains characters taken from a pool that contains [a-zA-Z0-9] and 32 'special' characters. That makes 94 characters in total. And this one: ...
0
votes
1answer
98 views

LastPass website requests Master Password when creating the account

When I wanted to tryout out LastPass today, I was stunned that the webpage form for creating the account at LastPass actually requested the "Master Password", which is the same "Master Password" that ...
1
vote
4answers
211 views

How different should passwords be?

It seems to be generally accepted the same password should not be used for different sites or devices. How different should passwords be? For example +_^gum<JW1 and +_^gum<JW2 are very similar. ...
13
votes
3answers
3k views

Is it safe to generate passwords online?

I usually generate strong passwords using various online tools. Some time ago I mentioned it to a friend of mine and he was shocked that I do such dangerous thing. Is it really so unsafe to generate ...
6
votes
2answers
133 views

If no maximum length is placed on a password, can't collisions occur?

As I was thinking about storing password hashes in a database, it dawned on me that there might be hash collisions if there is no set maximum length for the password being hashed. My understanding is ...
2
votes
3answers
1k views

Key stretching a hash

If I implement a function which hashes the first half of my password with MD5 and the second half with SHA-2 and MD5, is there a security issue when I put these two hashes together to create a 64 ...
1
vote
3answers
649 views

Need a word-list generator from a few words and numbers

I have an old rar backup and I am trying to recover the password. I remember the words in the password, but I usually add some numbers and cap some characters (don't know which ones though). I have ...