Questions tagged [passwords]

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

163 questions with no upvoted or accepted answers
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295 views

How to determine the number of characters changed between two passwords as per DISA Application Developer STIG rule SV-84187r1_rule?

The DISA Application Developer STIG specifies: Group ID (Vulid): V-69565 Rule ID: SV-84187r1_rule Rule Version (STIG-ID): APSC-DV-001730 Rule Title: The application must require the change of at ...
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2answers
340 views

Which user authentication measures are used nowadays?

I was reading about Passwords and came across methods used for authenticating client to a server. Since sending password in Plain text to the server isn't the best method for authentication of a user, ...
4
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0answers
272 views

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 ...
4
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0answers
131 views

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 ...
4
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0answers
135 views

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 ...
4
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271 views

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 ...
4
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0answers
1k views

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 ...
3
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0answers
69 views

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?
3
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0answers
863 views

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 ...
3
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0answers
755 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
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3answers
481 views

Secure preshared key 2 way authentication

I have the following setup: A server and a client will be connected over tcp. The server and client both have access to the preshared secret key. When the client connects to the server, the client and ...
3
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0answers
545 views

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 ...
3
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0answers
60 views

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 ...
3
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1answer
1k views

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 ...
2
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0answers
101 views

Why is John returning gibberish for cracked hashes

I've been messing around with John, and when I attempt to crack an SSH hash, I receive this output. Any clue why the cracked hash is displaying the gibberish?? I used ssh2john to convert the key to a ...
2
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0answers
33 views

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 ...
2
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0answers
59 views

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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0answers
87 views

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-...
2
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0answers
904 views

Recovered a 7z password with hashcat, but it's not the right one

I am trying to recover a 7z file, but have forgotten the password. It's completely AES-256 encrypted (i.e. not even the filenames are available). Steps: Generated hash file with 7z2hashcat.pl Ran a ...
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0answers
83 views

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 ...
2
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2answers
244 views

How to improve security of a stored password?

Our application needs to store a password in a database. It‘s not possible to store a hash because the password is needed to access other data that are protected by this password. Currently, the ...
2
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0answers
317 views

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 ...
2
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0answers
120 views

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 ...
2
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0answers
29 views

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/...
2
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0answers
55 views

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 ...
2
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0answers
222 views

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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0answers
355 views

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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0answers
82 views

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 ...
2
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0answers
186 views

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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0answers
107 views

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 ...
2
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0answers
52 views

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 ...
2
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0answers
498 views

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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0answers
93 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 ...
2
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2answers
393 views

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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0answers
40 views

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 ...
2
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0answers
492 views

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 ...
2
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0answers
78 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 ...
2
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3answers
2k views

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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1answer
49 views

Is username + password functionally equivalent to a single login string of the same length?

My intuition is failing me with this. Would it make it easier or harder for an attacker trying to gain access to any of the accounts in a database? I can see that in the case of a single login string, ...
1
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1answer
88 views

Is 2FA based on Google Authenticator Real?

I was reading this response on SE about 2FA: Well, I hate to break this to you, but Google Authenticator plus password isn't really two-factor authentication. Proper 2FA is two separate items out of ...
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0answers
69 views

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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0answers
134 views

Using John the Ripper for Blockchain.info second password

Is there a way to use JtR for Blockchain.info's (v2) secondary password? I already tried the blockchain2john.py file, and it does not ask for primary password (which I know already) so it is going to ...
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0answers
128 views

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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0answers
27 views

Is there record of a pubilc RDS instance with strong password having been hacked?

I am auditing an AWS account and I found a public RDS instance, that is with public DNS, no Security Group IP connection filtering and in a public Subnet However, the instance has a relatively strong ...
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0answers
226 views

John the ripper output formatting

I'm supposed to crack some passwords from a file. I've done john pwlist.lst > passwords.txt which is outputting the files into my txt file. I'd like to make it such that when John is cracking the ...
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0answers
141 views

Hardware for password cracking

I'm planning to extend my pentest services to Password Cracking, to be more precise: Cracking Active Directory Passwords, extracted from the customers Active Directory in order to check users ...
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0answers
54 views

Good use of libsodium?

I am looking to hash user passwords to store in a database that will likely reside on a user's intranet, so I am expecting the database to be classed as open and insecure. I am using libsodium 1.0.18 ...
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0answers
66 views

Strange cyrus/imaps Logins without valid password

I found apparently successful logins from a foreign ip-address to our cyrus-imap server: Nov 24 08:16:20 server-1 cyrus/imaps[12101]: starttls: TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits ...
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1answer
164 views

What is the minimum secure length for gpg -c file.txt?

I want to use gpg -c with a user-generated password that I can easily remember. Are 16 characters enough? for example would a password similar to "I own 32 houses." be bruteforcable?
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29 views

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 ...