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

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1answer
44 views

Is digested password safer than salted password?

which scheme is the better one in your opinion? I know that both are secure but which is better one? I know that digested passwords are very difficult or even impossible to decrypt. Thanks for your ...
1
vote
1answer
60 views

Multi hash security [duplicate]

Is md5(sha1(pass)) more secure than md5(pass)? For example in case of sqli when attacker cant get our hashing schema, brute force or dictionary attack would be much less efficient. Am i right or is it ...
3
votes
5answers
314 views

How to deal with password schemes that can produce weak passwords?

Introduction Since the xkcd note on password strength, there has been a lot of attention for password entropy. However, this raised the question: what if you used a strong scheme, but happened to ...
20
votes
9answers
1k views

Is a simple, but very long password a good password?

Is a password like wwwwwwwwwwwwwwwwwwwwwwwww9 (25x 'w' and a number) secure? It would be easy to remember.
9
votes
8answers
1k 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 ...
0
votes
2answers
55 views

What is the solution for handling exceptions in password hashing schemes?

There is a technique called password hashing that describes creating unique passwords based on a unique master key and a static and arbitrary hash value. Using this technique, the user only has to ...
2
votes
2answers
154 views

Should email verification be followed by password-based login? Why?

[This is a duplicate, considered off-topic at http://stackoverflow.com/questions/26564992/should-email-verification-be-followed-by-password-based-login-why] A typical account creation process seems ...
0
votes
0answers
206 views

Is the password “Z” more secure than the password “a”? [duplicate]

Okay, I guess it's not possible to call one-letter-passwords "secure" - so let's compare ZZZZZZZZZZ with aaaaaaaaaa. Both are using the same character pool [A-z], so the number of combinations for a ...
1
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0answers
174 views

How does an attacker authenticate to a service using just the hash of the user (after performing a pth attack)

Let's say the attacker got the username and the password's hash. How can he use it when authenticating to some service in its domain with NTLM , for example? How can he send the request as the ...
0
votes
0answers
127 views

oclHashcat error messag in Kali Linux

I am in the process of learning oclHashcat syntax. Currently, I am working on breaking a file of md5crypt strings with a dictionary file. The dictionary I am using is rockyou.txt from an installation ...
3
votes
3answers
143 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 ...
23
votes
11answers
4k views

One liner to create passwords in linux?

How do you create a readable password using bash with one line? What if i'm looking for 128 bits of entropy? EDIT By readable I mean the 94 printable ascii characters (without space). It can use ...
0
votes
2answers
122 views

Passwords: Symbols and length > 20 disallowed [duplicate]

I'm going through a bunch of accounts at the moment changing my passwords, some of them are looking a little weak and i've reused them, but i keep coming across websites that don't allow you to use ...
1
vote
2answers
80 views

Facebook security

I check my security settings (from my Facebook acc.) from time to time, and sometimes I see there are IP addresses which logged into my account but don't belong to me. When I look in the web who is ...
3
votes
6answers
8k views

Hardware USB Key to Reset Any Windows Password

This tool requires physical access of course, and there are many things you can do once you have physical access, but this peaked my curiosity. The tool in question: ...
5
votes
3answers
229 views

When form submission fails, password field gets blanked, why is that the case?

I've recently asked a question about blanking the password fields in UX for usability purposes, but It seems all the sites use this approach for security reasons. Why is it insecure to post back the ...
42
votes
6answers
3k views

Is the option to jump to blanks in password fields a security risk?

Using Ctrl + ← / →, it's a common behavior across different operating systems to jump from word to word (or from blank to blank) in text input fields. Now I've discovered that this also applies on ...
-1
votes
3answers
263 views

Gmail, Yahoo, Hotmail , and so on; How do they check the content of an attached password-protected archived file like Winrar?

How is it possible that mailing systems like Gmail, Yahoo, and Hotmail are able to check the content of an attached password-protected archived file like WINRAR, if the password cannot be guessed, ...
322
votes
12answers
52k views

What technical reasons are there to have low maximum password lengths?

I have always wondered why so many websites have very firm restrictions on password length (exactly 8 characters, up to 8 characters, etc). These tend to be banks or other sites I actually care about ...
-1
votes
2answers
10k views

Recover Windows Server 2003 admin password through restricted user

OK, so here goes after a lot of trial and error: background: My client recently took over another firm. However, apparently the administrator passwords to the server (along with some other non-IT ...
12
votes
6answers
2k views

What is the simplest safe way to convey a password to another person? [duplicate]

What is the easiest way for two people – neither of whom are computer specialists and cannot meet in person – to send a password for an encrypted file that is attached to an email? The two simplest ...
1
vote
4answers
103 views

Password recovery flow - Send Password recovery to any email?

I am building a new MVC app. Considering this "forgot password" flow: 1)You enter an email. 2)You press "send recovery password". 3)An email awaits in the inbox, pressing the link in it brings you to ...
2
votes
1answer
80 views

How to handle legacy website account login credentials

I have a lot (>1000) of credentials for website logins in my Chrome's password safe. Some of them are quite old (> 10 years) and have weak (dictionary) passwords. Some of the accounts have low value ...
1
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0answers
89 views

Database row level encryption scheme

I am wanting to secure some highly sensitive data in a database. This would mean that the data needs to be encrypted and remain secure for 100 years if it were to fall into adversary hands. I also ...
0
votes
3answers
116 views

One Less Password

I just came across this: https://blog.webmaker.org/one-less-password Basically a technique for eliminating passwords as the primary authentication mechanism for connecting to a website by replacing ...
1
vote
2answers
58 views

Would it better to enforce more complex passwords or passphrases? [duplicate]

I have read in different places that passphrases offer better security and are more user friendly however, I have also read contradictory information thats says longer passwords are not really more ...
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votes
1answer
112 views

I need help on how to hack into a scammer computer via IP/DNS [closed]

I really need your help in this one. Today I got scammed by a "trader" for 100$, but I managed to get his IP, reverse DNS and Hostname but I am unskilled in hacking. I need help here, I just want to ...
3
votes
2answers
2k views

How does Authy's 2FA work, if it doesn't connect to the server?

I thought I knew how two-factor authentication works: I enter the password. Server generates a random number (token) and sends it to me via SMS. I enter this token. Server checks that the token I ...
12
votes
4answers
3k views

Is an 80 bit password good enough for all practical purposes?

I know that asking how many bits of entropy comprise a strong password is rather like asking the length of a piece of string. But assuming the NSA is not on to you, and that it is hardly worthwhile ...
5
votes
1answer
494 views

Chinese or “pinyin” wordlists for dictionary attacks

Background: I am currently trying to crack a salted md5 hash which I have recovered from an embedded device running busybox and manufactured in china. I have tried john the ripper using all of the ...
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votes
3answers
141 views

My friend hashes passwords with SHA512 algorithm without salt. How do I convince him that he needs to add salt?

Today I discovered something incredibly stupid - my friend hashes user passwords with sha512 algorithm without a salt. I immediately raised this issue to him but he said he wants to see anyone crack a ...
11
votes
6answers
595 views

Security of carrying passwords on person

While in college I decided to have a randomly generated 16 character password. I used parts of that password in various sites. However, one of the sites was compromised so I had to change my password. ...
299
votes
20answers
50k views

How does changing your password every 90 days increase security?

Where I work I'm forced to change my password every 90 days. This security measure has been in place in many organizations for as long as I can remember. Is there a specific security vulnerability ...
2
votes
1answer
230 views

Is there more risk in changing administrator password locally vs from a centralized location?

I'm working on a mechanism to better handle group policy passwords in response to MS14-025. We formerly used this mechanism for setting the local admin account passwords on our workstations (primarily ...
1
vote
4answers
439 views

Authenticate user without knowing their password

I'm working on a project where each each user will have a public/private RSA key-pair. Users will be able to send encrypted messages to each other using the each target user's public key so that only ...
1
vote
1answer
1k views

Due to which reason might a windows 7 password been reset to empty?

A user reports on monday he cannot access his windows 7 account anymore due to a "wrong password", which perfectly worked on friday. It turns out the password has been reset to empty for that account. ...
0
votes
1answer
47 views

Securely map random string to a custom charset

I'm writing a Python script to generate custom passwords based on a HMAC. I want the passwords to support various websites requirements so I want to map the HMAC output (ex: hex format) to an array of ...
5
votes
4answers
1k views

How can hackers guess passwords (using dictionary attack or brute force) without being locked out?

Nowadays almost every website you want to register in; is asking you to create a complicated password...But why cant we use simple passwords? I am just wondering because in case of multiple wrong ...
3
votes
4answers
9k views

A low tech yet secure way to keep track of passwords?

I use LastPass and love it. My girlfriend creates her own long, complex, unique, and thus difficult to remember passwords for every site. She frequently forgets them and has to rest the password. ...
0
votes
3answers
125 views

Can you have Secure encryption with a backdoor, and still be secure?

Is it possible to have an encryption algorithm/implementation that has a "backdoor", that also wouldn't introduce flaws into the encryption? For instance, if you have a master password, once that ...
3
votes
1answer
136 views

Windows system password hashed - see which hash is used

How can I know / see if my windows is using NTML, LM, NTML2 for its user account passwords? What is the standard today, in windows systems?
2
votes
1answer
179 views

Storing a user's password in a retrievable manner

I currently store my users passwords as PBKDF2 hashes, for the authentication part of my web application. Each user also has their own private key and public key (also stored in their user profile in ...
13
votes
5answers
3k views

What is a good practical (and sane) way to manage all your passwords for online sites?

I am just a mere mortal that wants to have a somewhat secure way of managing all my passwords. This is something that I have been putting off, but since LinkedIn decided to give away one of my ...
63
votes
4answers
13k views

Recommended # of iterations when using PKBDF2-SHA256?

I'm curious if anyone has any advice or points of reference when it comes to determining how many iterations is 'good enough' when using PBKDF2 (specifically with SHA-256). Certainly, 'good enough' is ...
0
votes
0answers
197 views

Hydra sometimes fails against my own router known password

Hydra sometimes fails against my own router known password. Sometimes confirms it was found, and sometimes returns unusual error code (empty). What does this means? dione@saturno:~/misc$ hydra -l ...
6
votes
5answers
27k views

How to generete dictionary for brute force attack?

I need to crack my own password. Advantage is that I know possible characters and maximum length. What I need is to create dictionary for brute force attack. Dictionary should contain all the combos ...
1
vote
0answers
372 views

John the Ripper - Calculating brute force time to crack password

I'm using incremental mode (brute force) mode in John the Ripper to crack Linux MD5 passwords. I'm trying to calculate the time it will take to run through all combinations of 12 passwords (with 12 ...
7
votes
7answers
1k views

Facebook account keeps getting hacked, can't seem to figure out why or how?

One of my mate, she has a lot of friends on Facebook, uses it for marketing. Her account keeps getting broken into. Her password gets reset and/or gets locked for changing resetting password too many ...
0
votes
1answer
235 views

How compromised should I assume my computer is?

I had turned ssh on a while ago to do some remote work. I was just looking over some netstat info when I noticed someone had established an ssh session with me D: I turned ssh off immediately and ...
3
votes
3answers
237 views

Is it ok for software to store passwords locally in plain-text?

There are already plenty of questions about what to do when websites store plain-text passwords. But this one is a little different. I use a piece of open-source (see below) software for playing ...