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Questions tagged [passwords]

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

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77 views

WinSCP :: Percent-encoding in SFTP password, why?

I recently discovered the problem with Percent-encoding. It makes perfectly sense when we are dealing with such problem in a browser scenario. But I don't get why a software like WinSCP can be ...
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1answer
57 views

Not the same password for AWS (root user) and Amazon.com shopping, because that is not secure in my eyes

I use the same email address for the AWS root user and my Amazon shopping account. Unfortunately the password for both parts of Amazon is also the same, when I change the AWS password I automatically ...
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What is the maximum practical limit for secret storage in the human brain? [closed]

I understand this question is more for a psychologist or a linguist to answer, but I'd imagine having a thread on the security section of stackexchange for known password entropies practically used ...
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1answer
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Crack 7Z password if I also have the original file

Some of my files have been encrypted by ransomware. I can find some backup of files (unfortunately not all of them). Can I find the password of the 7Z zipped+encrypted files if I also have some of the ...
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3answers
115 views

Is using random salt to pbkdf2 for every request to Rest API good/bad?

Here are my conditions: My Rest API must accept username and plain password. But, that's very bad. That's why the client must encrypt the password first and my rest API will decrypt it to get the ...
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1answer
65 views

VeraCrypt: Is it possible to change the master key?

The password in VeraCrypt is used to en-/decrypt a header, that contains a master key, that is used to en-/decrypt the data. I know, that I can change the password, which will not change the master ...
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44 views

Reset linux user password with ssh key based access [migrated]

I'm not sure if what I'm trying to do is possible, so I wanted to see opinions of security people. I have a remote nvidia device left with default credentials and someone brute-forced the device and ...
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How to use scrypt or Argon for Openldap version < 2.4.5 [migrated]

I know that support for Argon2 was released with OpenLdap 2.4.5 according to this link https://bugs.openldap.org/show_bug.cgi?id=8575, but what if I want to use it with a previous version like 2.4.4 ...
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1answer
37 views

ncrack ssl option

There is the following option in ncrack (from the man page): Misc options: ssl: enable SSL over this service ssl (Enable/Disable SSL over service) By enabling SSL, Ncrack will try to open a TCP ...
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1answer
238 views

John the ripper not able to crack the password

I generated two hashes from this site: Plaintext 1 (p1): world Salt 1 (s1): hello Hash 1 (h1): 936a185caaa266bb9cbe981e9e05cb78cd732b0b3280eb944412bb6f8f8f07af Plaintext 2 (p2): world2 Salt 2 (s2)...
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1answer
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Is pbkdf2 with hmac using md5 still secure?

I have an old system that can do PBKDF2 with HMAC using MD5, but not SHA-2. Now I know that MD5 is insecure and shouldn't be used for new applications, but https://crypto.stackexchange.com/a/9340/...
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1answer
79 views

Submitting password over untrusted VPN

Hi,I do not work in IT security and hence am asking some general questions here. I read https://security.stackexchange.com/a/172821/266785 and have questions that would appreciate answers. Is my ...
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1answer
90 views

Store a password as an identifier (as safely as possible)... since there is no other choice

I have to deal with a place that has some terrible security practices. For example, this place gives people passwords (eg. domain logon on Windows, but paired with their name as the username) that is ...
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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, ...
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1answer
115 views

strength of 64 character long password with containing only Hexadecimal digits (xdigit)

I wrote a small shell function to generate random passwords. Such a password may look like the below. D2fdAbE5e9bcAFDBE5bEeED3b795ecf44B35e99B6D28591429fEE6B7C0BcCed1 I started to wonder if this is ...
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3answers
160 views

Is it sensible to accept a password + any other random characters for successful authentication?

Supposing a user of my system has set their password to Password123 At the login screen, what would be the security implications of me accepting: Password123 or Password1234 or Password123ABC Based on ...
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1answer
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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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162 views

To lighten server load, is hashing a client-side Argon2-hashed password with SHA-256 on the server-side at least as safe as server-side only Argon2?

I am trying to achieve better security in my authentication system implementation with both server-side hashing and client-side hashing. (See the first reference below for more prerequisite knowledge.)...
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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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4answers
173 views

Forget Me Not? Abandoning the Forgot Password Functionality

They say a chain is only as secure as its weakest link. When it comes to account security it seems to me that the Forgot My Password functionality is the weakest link in the security chain because it ...
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6answers
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Is it insecure to display the number of characters when users enter a new passphrase?

When users are entering a new passphrase somewhere, it's helpful to provide feedback on the number of characters received by the system. In a user experience (UX) test I just ran, my user created a ...
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Specification of AES-based PKCS#5 Password-Based Encryption (PBE)

recently I had a look at the capabilities of the Java keytool to create PKCS#12 containers with a protected private key. According to the standard a private key is protected using a PKCS#8 shrouded ...
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What are security risks of a domain user accounts with denied interactive logon?

When I create domain user account with denied interactive logon, what are real security risks when hacker gets the password? http://paulasitblog.blogspot.com/2017/01/deny-interactive-logon-for-service....
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1answer
81 views

Company sent me a registration email with a clear text password [duplicate]

I recently signed up for a company's product, and promptly received an email confirming my registration, showing both my email address and my password. I'm not a security expert, but that was a huge ...
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2answers
67 views

With Network Security Systems Decrypting SSL traffic to scan for Malware Is Server-Side hashing of Credentials Still Enough?

I am not a Security Expert by any means. Nor am I a Cryptographer. That's why I'm here. After discovering that the server side of some software I work on was operating on plain text passwords (though ...
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1answer
65 views

Password list where a password policy was used

I found a list of common passwords (i.e. "123456", "password", etc.) online. Is there a public / open-source set of common passwords where a password policy was in use? Example of ...
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1answer
118 views

Is there any security flaw in this C program to generate a tabula recta?

In order to generate and store my passwords, I decided to use a tabula recta as described in this article. So I coded a simple C program to create such a table, I wanted to know if it contained a ...
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3answers
143 views

Does hashing syslog (or similar) make for good passwords?

I thought of an approach to password generation that I haven't heard of anyone else using. It almost seems too good to be true so I wonder what the downsides are. I'm well aware that you shouldn't &...
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1answer
148 views

How does Firefox protect Logins and Credit Card Data?

I have a question about how Firefox protects Login information (Website passwords) on the one hand and Credit Card data on the other. I noticed that there are two different approaches to how Login ...
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0answers
89 views

Speed up cracking a wpa2.hccapx file in hashcat

I'm trying to do a brute force with Hashcat on windows with a GPU cracking a wpa2.hccapx handshake. Based on my research I know the password is 10 characters, a mix of random lowercase + numbers only ...
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1answer
106 views

Why is entropy measured in bits?

I use KeePassXC to generate and store passwords. For example, generating a password with a length of 128 characters without using the extended ASCII character table, the entropy is about 770 - 800 ...
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72 views

Get encrypted PDF password

For a CTF challenge, I got a locked PDF file with a data folder that contains images, a plaintext file and a wav audio file. I used pdf2john.pl to get the password hash and I performed a brute force ...
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1answer
122 views

Does using a random number of iterations for PKBDF2-SHA256 help if I only have to protect one key used to encrypt a password protecteded file? [duplicate]

I read about Recommended # of iterations when using PBKDF2-SHA256? I have also read in Why not just use a small but unusual number of hashing rounds? that when there are multiple password to protect, ...
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1answer
85 views

Cracking Lost Password for encrypted 7z file with most characters known

I forgot password to 7z archive encrypted with AES 256. I am fairly certain of most characters however. I know password length is either 8 or 12 characters and if it is 12 I know the last 4 characters....
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49 views

John The Ripper numbers mask

I'm using john on Windows and I use pdf2john. What do I have to do to crack this password? I saw previous passwords and they were 4 digits (1234), possibly there may be more now. currently trying to ...
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1answer
47 views

If a platform/system has brute force protection should I care for a very strong password

If a platform has brute force protection should I worry about creating a very strong password since any attacker would not get a chance to reach enough attempts to crack even the weakest password? Not ...
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3answers
4k views

Why not just use a small but unusual number of hashing rounds?

When it comes to hashing passwords, it is nowadays practice to do 100'000 or 200'000 iterations of SHA256/SHA512, or at least something in that ballpark. But my question is, why is it not safe enough ...
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2answers
52 views

Sending password in separate email [duplicate]

I've noticed some services will send a username in one email with a note saying the password will come in a different email. Is there any point to this? It seems that if someone can get that email ...
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1answer
109 views

What are the security implications of the password policy for this bank? [duplicate]

I am aware of a bank (redacted for obvious reasons) that has the following password policy. Only English alphanumeric characters Min of 8, max of 14 characters No special characters (ex. !@#$%^&* ...
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0answers
120 views

I can't decrypt chrome passwords offline with sha masterkey

I'm trying to decrypt a Chrome 80+ Login Data file offline using the SHA1 or SHA256 masterkey retrieved either using backupkey or lsass dump but no tool seems to work (I tried mimikatz, sharpdpapi, ...
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3answers
6k views

Not understanding why I should use public/private key encryption over password?

My knowledge about these topics is very elementary, please "school me" if I said something completely wrong, it would surely help me understand these things better. Now, to my issue. Now ...
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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 ...
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2answers
73 views

What are security benefits (if any) of using multiple passwords (device, password manager, …) vs single strong passphrase when paired with FIDO U2F?

I am evaluating security benefits of requiring employees (in enterprise context) to use multiple passwords (or passphrases) vs single strong randomly generated passphrase (minimum of 8 words) when ...
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1answer
56 views

How to merge two email boxes securely with an email box fetcher?

I have two email boxes: The first one is my main email box in Gmail and the second one is in my website hosting company by Thunderbird which I access from my website hosting manager (WHM) which is ...
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0answers
79 views

Where to store passwords needed by linux processes?

I am working with C++ processes on a linux (CentOS 8) environment. These processes should be able to access an encrypted file on the system. Where should I store the password for this encrypted file? ...
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3answers
148 views

Using Password Managers to store multiple factors, would this reduce security? [duplicate]

Assume I have a password manager that stores the credentials for a login to a 3rd party service. In this credentials the username, password and a TOTP-seed is stored and the current TOTP-token is ...
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2answers
290 views

What is the point of storing hashed passwords? If that file is read, doesn't that mean the computer has already been compromised?

Why is it necessary to store operating system passwords hashed? From what I've learned, passwords are stored on the hard drive/SSD in /etc/shadow. However, if a malicious agent was able to get access ...
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1answer
63 views

Can yubikeys prevent cookie stealing?

When you log into a website, it stores cookies that let your browser access the website without having the password. Given that some sites support yubikey for login, does it mean that the yubikey ...
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2answers
236 views

Does John the Ripper automatically account for salt and hash?

I have an embedded device running Armbian which I was able to get the drive image from. The entry in /etc/shadow combined with /etc/passwd after unshadowing is this: root:$6$TV6ML2bG$TncnN/adtU9xaQs/...
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67 views

Could I have prevented my Facebook password from being stolen by these trojan apps? [duplicate]

According to this Dr. Web article: Doctor Web’s malware analysts have discovered malicious apps on Google Play that steal Facebook users’ logins and passwords. These stealer trojans were spread as ...

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