Questions tagged [passwords]

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

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8
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1answer
417 views

Why do some sites enforce low-security passwords? [duplicate]

I get that what comprises a good password is a bit of a moving target and not everyone agrees - just run a password through a number of checkers to see how it is rated differently depending on the ...
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0answers
26 views

How can multiple factors in authentication be combined to have a higher level of security? [closed]

Authentication factors can be categorized as "Something you have" "Something you know" "Something you are" "Somewhere you are How can these factors be combined to ...
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0answers
28 views

Confusing Cisco enable password format [migrated]

I'm totally confused by this Cisco password format: enable password level 15 encrypted 382fda4a4a26e6637edac0eb8b8ba4581087d32d Overall string is 40 bytes long: $ echo -n ...
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2answers
79 views

Password security against Brute Force - local vs online attack?

I always wonder about the generic statements about the security of passwords. Isn't it a huge difference if the password is used for an online account or for local data encryption? For example an ebay ...
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0answers
63 views

Strange account activity - how to investigate

Today I have observed very strange scenario which appears to be attempts to hack an account. So first, let me tell the pre-story: I have started to receive 2-factor authentication SMS messages from ...
7
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4answers
4k views

Storing Username and salt in separate table

You have a User table: UserID (auto-incrementing Integer) Password hash LastLogin All related tables are linked by the UserID. You also have a Username table: Username Salt IncorrectLoginCount ...
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1answer
119 views

What is the plaintext password of 'hash part 1' in the shadow file?

on immersivelabs lab Password Hashes II https://dca.immersivelabs.online/labs/password-hashes-ii/ there is a question: What is the plaintext password of 'hash part 1' in the shadow file? shadow.txt ...
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1answer
28 views

Open IMAP connection using hashed password

I make email client over IMAP protocol. To "remember" user's connection details (email, password, host, etc.) I need to store password in plain text, because otherwise I won't be able to ...
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7answers
2k views

Timing attacks in password hash comparisons

I had a discussion with a friend today about his password hash comparison. I argued that you can't return false on the first hash mismatch you have and I sent him a link to an article about a Java ...
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2answers
69 views

Worst case scenario for compromised private key in server certificate?

Assume that someone gains access to the password used for my key store containing my server certificate and it’s private key. I guess without direct access to the server running my application the ...
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0answers
13 views

How to know the algorithm used to convert the password? [duplicate]

How do i know the algorithm being used while generating this password? 78:C5:F8:ED:AB:3B to: 90BF8F3AD17 78:C5:F8:ED:AB:3C to: DDAD73B1433 Ps. you could probably omit the ':'.
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1answer
45 views

Does the random presence of a common password sequence within a larger password weaken the password?

I have a somewhat basic understanding of how entropy relates to password strength - generating a password with a truly random selection from some set (whether that's characters, or a set of dictionary ...
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0answers
34 views

How does the autofilling of private user credentials work? [duplicate]

In the one hand we have a google's password store (or things like LastPass, 1Password, etc.) and it's ability to autofill your credentials when you need it. In the other hand we have a password ...
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0answers
14 views

Is password less login secure? [duplicate]

Recently I came across this password less login. For authentication, we need to enter an email address and click on a login button. We will receive a link in your email and when we click on that link ...
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2answers
168 views

Encrypting a password with its own hash

I just found out that an e-commerce platform (similar to Shopify) I was planning on using allows me to see my password. I know I can't assume anything and I should (probably) just run away from it, ...
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0answers
40 views

Entered FDE password in GRUB by mistake

For several reasons (I have an external monitor, etc.) when I booted the laptop I typed the FDE (Full Disk Encryption on Linux, LUKS) without looking at the monitor, and I ended up typing the full ...
0
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2answers
121 views

Why PIN exists?

Correct me if I'm wrong, but it seems PIN is merely a password but only allowing numbers (and short max length on some services). That sounds very insecure to me, but many services are using it. ...
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0answers
21 views

Are 2FA options available when booting into your laptop? [duplicate]

Are there any 2FA methods that can be used when accessing the BIOS or booting into your Hard Drive? If not now then what about the future?
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0answers
43 views

Review of the design of Credentials Manager app

I want to make a mobile app that will act as a Credentials Manager and store all my access information for websites, credit cards, secure notes, and so on on the server encrypted with REST API. The ...
0
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0answers
33 views

Building a dictionary [duplicate]

I want to create a list of passwords to perform dictionary attack. Please show me how to build a password dictionary file. First, I gather information from users like hobbies, date of birth, favorite ...
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0answers
27 views

Received email with password in the subject - To what extent have I been hacked? [duplicate]

I was cleaning out my spam folder, when I saw one with a subject line which had a little-used password of mine. 16 hours ago. I'm fairly sure odds of guessing this password are small, so I looked. The ...
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6answers
5k views

Why use entropy at all in considering password strength?

I don’t understand the password vs. passphrase analyses that I read. Let me explain. Here is a pass phrase. It has 5 words using only lower case (I’m ignoring randomness for this purpose): friend ...
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0answers
65 views

SECURITY VIOLATION: Root login attempted - Which password is affected?

Logwatch shows that proftpd was tried to be logged into using root 0.0.0.0 (111.254.68.221[111.254.68.221]) - SECURITY VIOLATION: Root login attempted I found: Normally, proftpd does not allow root ...
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1answer
52 views

Is it safe to type a password in a VNC client connected to a server to access another server? [closed]

I am using VNC GUI client from my Desktop to connect to a remote (ubuntu) server, say S1. From the remote server (S1), I will be logging into another server (say S2) via SSH. Via VNC client, I will be ...
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2answers
72 views

E2E encryption for web app - two passwords vs encrypting data with login pass and sending only hash to server

Hello I am looking for some compromise with integrating E2E encryption for web app (basic FE and BE). Basically I read about two concepts which are trully E2E encryption and not that much complicated. ...
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2answers
103 views

Does storing all the passwords a user has ever used create a vulnerability in the broader password environment?

By saving all the passwords for all users forever, are companies accidentally creating a less secure environment? Related to this question: Why do some sites prevent users from reusing their old ...
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0answers
40 views

Is storing passwords in encrypted container still bad practice? [duplicate]

Suppose I need to store a bunch of passwords: storing them in a txt or odt file inside an encrypted container, such as the ones produced by VeraCrypt, is bad practice? Would I put myself at risk? If ...
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1answer
50 views

Is it bad practice to publish details of password complexity requirements? [duplicate]

I've noticed that some sites publish very detailed password requirement statements to users. Here's an example screenshot (not singling out this site - just a random image that came up when googling '...
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2answers
2k views

Should http basic auth passwords be stored hashed serverside?

HTTP basic auth sends credentials un-hashed and unencrypted over the wire, relying on TLS for confidentiality in transit. However, should the password be stored hashed using a standard KDF in the ...
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2answers
79 views

Is adding encryption before hashing more secure?

One way to secure a password in the database is to hash it with salt i.e. appending a random string to the password and then hash it and store the value. Does encrypting the password || salt then ...
1
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1answer
165 views

Why limit password length?

This question is inspired by Is there any security risk in not setting a maximum password length?. Specifically the accepted answer https://security.stackexchange.com/a/238033/9640 says limits are ...
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2answers
7k views

Is there any security risk in not setting a maximum password length?

I'm a listener of the podcast "Security Now" where they often claim that there are no reasons to limit the number of characters a user can use in their passwords when they create an account ...
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0answers
27 views

Handling parallel login and Max invalid attempts using OTP with same phone number

I am designing a login system that performs login operation using OTP and Email ID of the registered user. The current approach is as below User enters the Registered Email Id If the Email ID is ...
0
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2answers
42 views

How do I make a word list for cracking password? [duplicate]

I already know the password format: 1 Upper Case Letters + 5 digits + bf (bf is the known letters, they must included in the password and at the end) For example: A12345bf, C12301bf, D10282bf. I want ...
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2answers
110 views

How do I brute-force a password when I know the format? [closed]

The format is 1 letter + 5 numbers (e.g. A12345). Any method and software?
0
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1answer
81 views

What happens if I reuse passwords

I want to understand the risk in reusing complex password. Unique complex passwords for each and every email account, say 3. All other accounts, bank, medical, social, share a complex password, 1 ...
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3answers
74 views

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 ...
1
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1answer
65 views

Securely storing a master key client-side

My company is currently evaluating a product which comes with a browser-extension-based password manager. The password manager is peripheral to their core product, but is the only way to use it. We're ...
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2answers
121 views

Is my email, pc or something else hacked?

Recently I registered iCloud account with my gmail account. Now I received fake email from "iCloud" on mail.com email address which I use frequently for registering accounts on various sites....
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2answers
49 views

What can you do to make a hashed token database retrievable at a later date?

I have a table for single use tokens, and one of the columns is a token_digest which contains a bcrypt hash of the access token. Since the token_digest is a salted and hashed version of the plaintext ...
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2answers
163 views

What's the difference between these MD5 hashes?

What's the difference between this format: Hash found: admin:$1$$oLN1UCc1Y3T30QkMcKMSx0 and the following: 5f4dcc3b5aa765d61d8327deb882cf99 And also, How to turn the first hash format into the ...
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0answers
61 views

How is asking for a previous password a good practice?

Since data leaks are being more and more common, why companies like Microsoft and Google (but I'm not asking just about them) ask for a previous password if a user try to recover it? Google's password ...
0
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2answers
73 views

hide_my_wp wordpress plugin is activated with php eval function that might trying to read /etc/passwd? Is it true?

When I install this plugin and activate in wordpress, hide_my_wp put some eval codes in wp_options and I see the following code being injected in a new row with the ID called 76624: upload-dir=./../../...
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0answers
77 views

(Re)Hacked Instagram accout even if Two Factor authentication was enabled

A friend of mine, let's call her Alice, had an Instagram account that was hacked. She uses an iPhone. The scenario looks like this: Alice gets a link from a Business Account via WhatsApp, and clicks ...
2
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0answers
136 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 ...
24
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6answers
7k views

Password entry: are “paste from password manager” and “eyeball to view passwords” mutually-exclusive features?

Context NIST SP 800-63b gives the following guidance for password forms (aka login pages): Verifiers SHOULD permit claimants to use “paste” functionality when entering a memorized secret. This ...
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2answers
87 views

Is it unsafe to have some users with passwords and some without?

I'm working on an app where some accounts use passwordless authentication by email (using magic links) and some require a password to login. Is it okay to represent this rule in the account table by ...
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0answers
55 views

Can a secure key-exchange algorithm replace hashing for password authentication?

Over the weekend I was thinking about the problem of scaling various web services. One common practice to scale authorization is to use cryptographically signed tokens. This way when a request comes ...
1
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1answer
102 views

How to apply custom filters for John The Ripper when cracking RAR3 archive password?

My problem is that I'm trying to crack RAR file with is encrypted with RAR3 encryption. Decided to try with John The Ripper. Here are clues I have from my friend. Max password length is 8 Only ...
5
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2answers
1k views

Does brute-force time depend on the length of a password only? [duplicate]

If a password is +30 characters long but contains words from the dictionary, is it less secure than a 10-character password that is !@#$#%$^%$, for example?

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