Questions tagged [passwords]
Specific to the security of passwords: hashing, entropy, cracking, resets, lockouts, etc.
169 questions with no upvoted or accepted answers
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How does Google Chrome's "Warn you if passwords are exposed in a data breach" feature work?
This feature is enabled by default. It says the usernames and passwords would be encrypted before sending to google. But google would know the encryption keys it used and to compare it with leaked ...
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Maximum password length for user accounts on Ubuntu
I have a VPS hosted at a remote location. Obviously the host can login directly (without SSH or any keys) on this box and I want to make brute force password guessing as hard as possible for a bad ...
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How vulnerable are password managers in the real world?
I'm a senior undergraduate majoring in computer science. I recently took a computer security class where instead of exams we had a final project that could be anything related to computer security.
So ...
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How to mitigate insecure password policy that I am forced to use?
The site in question is the UK regulator for companies at https://ewf.companieshouse.gov.uk. Online access to a company on this site enables the user to file/change various critical things on behalf ...
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Quantify security strength from entropy and lifetime
Entropy or randomness is a quantitative measure of security strength for various types of passcodes, but in current times with digital technology, breaches, and cracking tools it seems that lifetime ...
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GPG: how to encrypt using a keyfile? (symmetric)
In Ubuntu this produces a "filename.txt.gpg" file and works:
$ gpg --symmetric --passphrase-file keyfile.key filename.txt
In debian, I get a popup requesting I enter a password...
How do I encrypt ...
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Saved password store on Android Edge browser
Does anyone have knowledge, or better yet, a reference document showing how and where passwords are stored when using the Edge browser on Android?
I'm assuming it's going to be SQLite, as I ...
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How exactly does "Apache Shiro's" hashing work when using a Desktop-Client
I was looking at this question
How does storing hash passwords work?
and every answer essentially says that Hashing is done via the server, or most of it should, as that is the safest way to do it. I ...
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Can a bad guy ever get access to my gmail account using ONLY the 2fa app or ONLY the recovery phone (plus username)?
Let's say X is a malicious person.
Let's say I have a gmail account with a recovery phone and with 2fa
enabled. Let's say X knows the username but not the password. X doesn't have any other ...
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Security of in-app Forgot Password workflow in Xamarin (Mobile App) without using a website
I decided to implement "forgotten password" functionality, without having to create a website just for that. The usual workflow that I've seen for any app is:
User requests password reset
...
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JTR finishing very quickly with rockyou.txt and not cracking the hash
I've been fumbling through the world of Information Security by going through the HTB challenges, and I've come across an issue I just can't seem to find an answer for. During one of the challenges I'...
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Can I skip any password hashing for localhost authentication?
Setup
I have several services (Postfix, Apache (PHP)) that access a PostgreSQL database on a Debian Linux 10 system.
everyone is on the same host
they use the loopback interface (127.0.0.1) to ...
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Any data on how many users change passwords after a breach notifcation?
Does anyone know of any study or any data whatsoever which might indicate how many users actually change their passwords after they have been notified that their credentials appeared in a breach?
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Add additional rounds on existing SHA-512 salted hashes without knowing clear text password?
Assuming you have a salted SHA-512 password hash with 5000 rounds. For example:
{CRYPT}$6$rounds=5000$6835c5dcf0bb7310$hVod/jy7uONMSa.FVpLHb/2OrWpAj3lB/....
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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”.
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Can we capture security key used in an NFC connection for Mifare Classic?
Millions of NFC Mifare Classic cards are used for public transport, access control and other purposes. These NFC tags use encryption so that the data on NFC tag cannot be read or changed by someone ...
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Security concerns for long-lasting single use access tokens with secondary identity verification?
I have an application that has a user type that "returns as needed" over the course of 22 days to complete action items. The application handles sensitive/confidential information, but > 90% of users ...
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How secure is automatic authentication in Skype?
How secure is checking the automatic authentication option in Skype client? What if I sign in with Microsoft account instead of Skype id? What if both accounts are merged? Is there any documentation ...
user31793
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Securely changing Veracrypt password
How can I change a Veracrypt (master) password efficiently and securely?
Based on the answers here, it is not safe to use system --> change password due to various reasons.
I cannot simply image ...
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How to investigate further the iOS notification "This password has appeared in a data leak"?
On the iPhone managed by my employer, I recently received 3 notifications of “This password has appeared in a data leak”, and they're all related to instances of outside vendors setting up a ...
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I linked an account with Plaid. If I change my username and password, will that mostly protect me in the event of a breach?
This is very similar to this question from 5 years ago, but I didn't see a clear answer: Is Plaid safe if I change the password after deposit?
I've linked an account with Plaid. That account is 2FA ...
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Windows AD - Fake User Account with Multiple Passwords to Detect Password Spray
TL;DR
I'm trying to implement a fake user account that has multiple sets of credentials that can be used. Instead of a specific password, any one password from a list of them could be used to ...
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How are the values of stored firefox credit cards encrypted? And how does one decrypt those?
While researching about the safety of web browsers I made my own program that can decrypt stored credentials, cookies, and other information of different browsers to see for myself how easy it is.
...
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Can SMB/CIFS credentials be extracted from Linux?
On a penetration test, I have completely compromised a Linux machine and I am now trying to move around the network. The Linux machine has a mounted CIFS share, and I want to get the password used to ...
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Entering password on third party websites to enable integrations
I've got a third party service that I want to integrate with various other websites/applications, the third party service says they support this however rather than using an API key or OAuth to ...
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Authentication in Desktop App
I'm reading the OWASP Authentication Cheat Sheet, but it obviously is focused only on web browser. I'm searching for something similar for a desktop app.
I want users to login to a desktop app. The ...
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Why does firebase encrypt with password hashes instead of storing the hashes?
I am trying to migrate off of firebase, as in doing so, you can export the hashes of user passwords. Looking at their algorithm, they do not store password hashes, but rather, they use the first 32-...
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Making custom wordlists for languages besides English
I'm testing a site whose audience doesn't usually have English as their main language. When it comes to non-English, I consider there to be 3 groups
The target language's alphabet is a subset of the ...
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Password storage/retrieval for local network server
I have an application server, written in C++ and also uses REST API to serve requests. There is no database, just a simple service which returns if the content of request is valid.
Situation
The ...
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If the given key of a Vigenère Cipher has repeated letters, does it make it any easier to break?
I am studying the Vigenère Cipher that given a passphrase uses rotating Caeser Ciphers to encode the plaintext. The ‘classical’ attacks on Vigenère first deduce the length of the passphrase by ...
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Admin able to set new plaintext user password - security problem?
I am working on this application that can be deployed and run by anyone on their server. Most often, it is run as a web service. In our new version, we removed the possibility for admins to set and ...
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Credential Storage for Partner/Vendor Accounts
We work with many other companies to do data exchange. As an example, we might work with COMPANY A to send them sensitive data over SFTP. This would be done by them giving us an SFTP Host/Account/...
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How do biometric password managers work?
Many password managers for mobile offer the option to unlock the password vault with a fingerprint instead of a password. If you never type in your master password, how is it possible to decrypt the ...
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For cloud-based password managers, is it safe to login using public WiFi?
For cloud-based password managers, is it safe to login when using public WiFi?
To help get good answers to this question, let's define 3 terms:
Cloud-based password managers = Password managers such ...
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User has been authenticated. Now what?
I'm trying to create a user authentication system for an application. I can't use a built in library for that such as ASP.NET Identity, but I can use any simple methods in .net.
Not wanting to ...
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WCF WS - Passing passwords through service
I am implementing security on a WCF service from basicHttp to WShttp, the issue is the service sends some passwords for connections to the database that the user can define,test and save.
The ...
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Protecting the password in a PBE scheme for an application
I am currently formulating security best practices and requirements for ongoing Java software development in my department and have settled with a recommendation of using the Jasypt framework for ...
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Native Mobile App Finger Print Authentication and web service.
I have developed many web based applications and focused a lot on authentication LDAP, SAML and in application passwords. Now I am moving to building native mobile application and would like to take ...
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Mimikatz hash dump of logged-off users
If I want to dump hashes of domain users on my computer, do they have to be logged on, or can I dump hashes of logged off users?
When I try mimikatz in my lab, I can only get dumps from others users ...
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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 ...
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What are the security features of the Microsoft PasswordVault class?
There doesn't seem to be much information on the PasswordVault but it seems to provide for local encryption of credentials.
There are references to it in this source code and this blog.
The reason I'm ...
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Syncing service passwords during offline installations
Due to very paranoid customer requirements, we have to install several Windows services on two different systems that should run under a shared service account. Each system should each have a copy of ...
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561
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Digital signature based authentication schema using two passwords
I'm working on an authentication system for a web based Bitcoin-related service. As part of the service, users do some less sensitive operations (mostly reading and sending various types of ...
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Rainbow Tables: Why do we need to store the last value of a chain?
Surely we could just make it so a rainbow table says for each beginning of chain do 10k iterations, and then we wouldn't have to store both values?
Or does by doing it this way stop collisions?
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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 ...
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Admin change user details / account information in admin interface
I'm creating this admin dashboard, and I have a question wich I have been stuck on for a while now.
And I'm starting to question what kind of data the admin should be able edit/view on the other ...
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What is the logic of using numbers for Windows PIN?
Windows 10 and 11 have an authentication method based on entering a lower complexity code under certain circumstances. This is widely referred to as a PIN, indicating that these are widely thought of ...
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John not cracking an NTLM hash
I have been trying to do it with john the ripper as the following:
john --FORMAT=NT --wordlist=~/usr/share/wordlists/rockyou.txt hash.txt
the hash I am trying to crack is:
Computer:1001:...
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Resetting a well-protected Google account password
Situation: a new client came to me because of a torrent of identity theft issues. One of the issues: several of their Google accounts were having their passwords changed every few days. Each time, ...
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Amnesia and death proof master password
I have been thinking about how to store my master passwords (password manager, email and device passwords) for quite a while and I just haven't been able to come up with a satisfying solution yet. I ...
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