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

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0
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3answers
58 views

Password help with coding! [duplicate]

So, I'm terrible with any sort of coding, and I need help with generating a series of possible passwords. I've forgotten the combination of a password I put in for an email - I know the password, just ...
2
votes
3answers
125 views

How does a hash which contains algorithm to choose can be secure?

I was thinking about creating my own hash+salt function, something like sha1(password + md5(login)), then I read here (part 4) that creating it's own hash+salt function is a bad idea, because if the ...
6
votes
0answers
94 views

Which format of secret would be the most efficient for human memory? [closed]

I am talking about something-you-know identification factor. Examples of those formats are passwords, passphrases, pin-s, picture passwords ( ...
1
vote
2answers
126 views

Password Manager use and safety [duplicate]

I just recently read an article advocating the use of password managers, and while I understand why someone might think using these programs might be a good idea, it's my understanding that these ...
0
votes
2answers
68 views

Random characters and letters form obsfuscation

I know that this question has been asked many times, but would JavaScript encryption work if I just added 100 random numbers and letters to the password? That would be hard to reverse engineer, ...
1
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3answers
65 views

How do I allow only app to view/download files from server?

I have an Android app that uploads and downloads pictures from my dedicated server. However, before I go live, I want to know if there is some way I can secure the server to allow only my app to ...
-7
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0answers
54 views

Ask.fm cracking using kali linux [closed]

i was wandering if it is possible to hack my ask.fm account using kali linux cus i forgot my password and the email used in the account and i want to get it back ? Any help
-5
votes
1answer
70 views

Is there a way to hack passwords in kali linux without wordlist [closed]

I am 18 years old and i was searching for a way to hack passwords without a wordlist because it will take forever and may not work so i hope help . (I will not use this to damage anyone but just for ...
4
votes
1answer
213 views

Security of Yahoo's new authentication: On-demand password

Yahoo is trying to remove passwords from authentication and use on-demand password authentication system instead. I wonder how this new system will be secure? Even if somebody steal your mobile can ...
1
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4answers
59 views

Is it safe to use my personal password as my password in work related accounts?

For example I have this complex personal password cary1bondoc21cary2bondoc as my password and because I am forgetful I also want to used that in work related accounts like company email, etc. Is there ...
18
votes
4answers
4k views

Should I implement incorrect password delay in a website or a webservice?

With arguments expressed in this answer, there is a few seconds delay between user enters an incorrect password and when he/she actually learns, that password was incorrect. This security solution is ...
2
votes
3answers
107 views

Use the same password on different (very secure) sites?

I understand that one should not use the same password everywhere, as stated here for instance. Using the same password on several non-valuable sites may be considered acceptable: we simply do not ...
5
votes
5answers
2k views

Salted password + hash - is it really useful? [duplicate]

I am new to the topic and wanted to know the concept of having salted hashes before going down to the technical details. From what I have understand password - plaintext hash password - plaintext ...
1
vote
1answer
61 views

Prevent brute force attacks on web publishing logins

Presumably, if someone tries to brute force into your website's control panel at your web host's site - they will be throttled/locked-out etc. But what about the web publishing logins (Web-Deploy, ...
11
votes
5answers
2k views

Is this idea for a password manager secure? If so, why doesn't anybody use it? [closed]

I've been thinking of a problem with usual password managers: although they do provide better security than manually using passwords, there's a central database that can get lost, get compromised, ...
35
votes
11answers
6k views

Is it good practice to send passwords in separate emails, and why?

I have heard from different people and in different places that if I send an encrypted file to someone else, I should send them the password in a separate email; but why? If someone is sniffing, they ...
0
votes
5answers
935 views

Why do we use passwords on sites? [duplicate]

I don't have passwords for my personal sites. To sign up a user pick their username and enter their email. There is a logout button if the user wishes to log out. To log in you enter your email and ...
2
votes
1answer
97 views

Is it secure to set default value for password field?

I'm looking at an application where admins can "invite" users by email and invited users. Invited users then are sent a unique URL and are inserted into a MySQL database with status pending and an ...
0
votes
2answers
111 views

Saving passwords in database

I have recently been studying a lot on writing secure code and choosing secure methods for saving passwords to a database. I'm wondering if it's secure to use ready made libraries or APIs to do this ...
3
votes
2answers
117 views

Is there any history of a major attack using password reuse? [closed]

While everyone and their favorite webcomic seems to agree that password reuse is a major problem, some quick googling cannot seem to find any cases where it has been used on a large scale in an ...
6
votes
3answers
393 views

Am I in this particular case allowed, to store password in java program?

I have a Java-Server program running on Ubuntu-Server which gets every 5 minutes current location data of my android-smartphone (which I carry with me). My architecture is the following: My smartphone ...
8
votes
2answers
386 views

*NIX shadow file password format

I'm trying to get shell access to a router and have managed to retrieve its /etc/shadow file: root:$1$$N76hdwGfg11g0KdKbtyh21:0:0:root:/root:/bin/bash I've tried to use john to crack it but ...
-1
votes
1answer
76 views

Using Tor browser to use YouTube, account security is the problem

YouTube is not available in my country, but I want to make an account at YouTube and use it. I'm not interested in protecting my identity. It is fine if anyone can monitor it. The thing I'm interested ...
-4
votes
2answers
63 views

How does the password become 30,000 times stronger?

This google support page says: For example, an eight-character password with numbers, symbols and mixed-case letters is harder to guess because it has 30,000 times as many possible combinations ...
75
votes
12answers
14k views

Password rules: Should I disallow “leetspeak” dictionary passwords like XKCD's Tr0ub4dor&3

TLDR: We already require two-factor authentication for some users. I'm hashing, salting, and doing things to encourage long passphrases. I'm not interested in the merits of password complexity rules ...
-3
votes
1answer
78 views

What type of hash is this MD4(MD4(($pass)).(strtolower($username))) [closed]

Can I decrypt this hash? Domain Cached Credentials: MD4(MD4(($pass)).(strtolower($username)))
0
votes
0answers
60 views

Windows Credentials - read password

What is the cipher used by windows Credential Manager to generate credentials backup files (*.crd)? With a backup file from Credential Manager and the password used to created that backup file is it ...
8
votes
1answer
68 views

Is Rfc2898DeriveBytes using HMAC SHA1 still considered “secure enough” for hashing passwords?

I've been told by a CISSP that the .NET class Rfc2898DeriveBytes would not pass a security audit today because it still uses SHA1. It's reliance on SHA1 - even with the iterations - leaves it too ...
3
votes
1answer
88 views

Can OpenVPN monitor my passwords in my browser?

I want to know if I run OpenVPN when I want to log in to websites (like Gmail etc.....) is my username/password in danger? Can they monitor saved passwords in my browser or anything else? I'm new to ...
5
votes
3answers
185 views

Should I set a password for 'root'@'localhost' in MySQL?

The 'root'@'localhost' MySQL account can only be accessed by someone currently on the server hosting the MySQL server. Assuming that only the person or persons who are in charge of the MySQL server ...
1
vote
1answer
747 views

How does a password authentication over a TCP protocol actually work?

When coming up with a password based login protocol, many solutions come in mind: User sends password in plain text. Compute hash on Server, compare to hash in database. - Bad because attacker can ...
2
votes
1answer
98 views

Is it insecure to provide a hash of an AES password?

I have made some software that encrypts and decrypts files using AES. I was wondering if it is safe to write a hash of the password to the file so that the program can check if a password is correct. ...
-2
votes
1answer
73 views

Is a ZIP file password easy to break? [duplicate]

I thought that ZIP file passwords were a fairly decent protection. I came across this video, that seems to indicate otherwise. https://www.youtube.com/watch?v=SqRSNuJSm4o [12 minutes view time] ...
4
votes
2answers
99 views

Reset links in password expiration emails

Our organization is rolling out yearly password expiration to our 40,000+ users this fall and we have been socializing this change for some time now. However being such a large organization, our users ...
-5
votes
1answer
70 views

Make really personalised wordlist file

i want to make a really customised wordfile with: 4 letters first + 2 numbers example: divo11 or yeve11 And not like this: p0oiw1 or u4hf3e This wordfile is really important. How can I do it?
5
votes
5answers
593 views

How much is the entropy of a randomly generated password reduced if I regenerate until I get a password I like? [duplicate]

In many of the answers and comments on the well-known XKCD #936: Short complex password, or long dictionary passphrase? question, the importance was stressed of generating the password randomly, and ...
20
votes
4answers
3k views

How secure is Snowden's MargaretThatcheris110%SEXY password?

In an extra from Edward Snowden's interview with John Oliver, Snowdon advises that a good password to use is one such as MargaretThatcheris110%SEXY.. Also, on the Errata Security blog, Robert Graham ...
2
votes
1answer
55 views

How to securely derive a second password specific to an user

I'm giving each of my users an unique Blocktrail wallet that is protected by two API keys (which the server knows) and one passphrase (unique to each wallet). I want the wallet's passphrase to be ...
5
votes
1answer
164 views

Is Django's approach to password reset tokens secure?

I am implementing a password reset feature for a web application and am contemplating adopting an implementation similar to Django. In a nutshell, Django creates a token who is comprised of a ...
1
vote
0answers
81 views

WifiPhisher not creating a fake access point

I recently came to know about WifiPhisher. To test it, I set up an access point using my Windows laptop and tried to obtain its password using this tool in my Ubuntu machine. So, when I run the ...
2
votes
1answer
101 views

How much does knowing the zxcvbn password strength help an attacker?

On an answer to the question How critical is it to keep your password length secret?, Mike Ounsworth commented that by storing the zxcvbn-calculated entropy of a password you make it easier for an ...
4
votes
1answer
109 views

How to detect a database leak

Website keep getting hacked every day and every now and then we hear website owners react and tell "affected users that their password might had been compromised". Most sites that disclose such leaks ...
2
votes
1answer
75 views

Save Password length after hash to minimize calculation

Reading this topic How critical is it to keep your password length secret? following scenario comes to my mind: Assume I've a web application (PHP written using password_hash()) using salted password ...
7
votes
3answers
2k views

How are leaked government credentials possible and what's the point?

In the wake of all these leaked/stolen/hacked government login/passwords being stolen it got me thinking. How is the leaking of these passwords even possible? Or are they of any real use? Aren't all ...
2
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1answer
146 views

Dump linux password in clear text

Is it possible to dump a Linux password in clear text format? In Windows it is possible to do so using "Windows Credential Editor".
3
votes
1answer
100 views

Bash scripting and password input

I am writing a bash script and prompt the user for his password. This password is supplied for either a local or domain account to query a MS SQL Server (using sqsh and freetds). How secure is the ...
2
votes
2answers
218 views

My Virgin Media account password is visible in plaintext to call center staff. What do I do?

Whilst on the phone to support staff (about billing) to Virgin Media, perhaps the largest ISP and telecoms company in the UK, I was asked to confirm my password over the phone. I asked the advisor ...
83
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11answers
12k views

How critical is it to keep your password length secret?

Is keeping your password length secret critical to security? Does someone knowing that you have a password length of say 17 make the password drastically easier to brute force?
6
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1answer
185 views

What are the pros and cons of using sha256 to hash a password before passing it to bcrypt?

My apologies if this has already been asked. I recently became aware of the fact that bcrypt truncates passwords to 72 characters. Practically speaking my intuition is that this does not pose any ...
7
votes
2answers
277 views

Odd password scrambling algorithm

I'm researching an application that has password scrambling algorithm that I've not seen before. I generated a few passwords (the max. length allowed is 8 chars), and got the following results: ...