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

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10
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2answers
1k views

How should I make diceware passphrases more memorable?

I find that truly random diceware passphrase, more often than not, either contain a word that is easily misspelled or has an order that is illogical. I think there are three ways to make a diceware ...
2
votes
5answers
773 views

passphrases - lowercase and dictionary words

Amid all the discussion about password length vs. complexity (summarized by the famous xkcd strip and the followup dicussion) I am trying to make up my mind about passphrases made up with dictionnary ...
1
vote
2answers
155 views

Keepass - password paranoia

How do I know that the Keepass app isn't behind the scenes at some point sending my master password over internet to some secret site whose job it is to collect them and use them for evil means?
7
votes
1answer
287 views

Why does OWASP recommend security questions?

I was reading the OWASP Forgot Password Cheat Sheet when I stumbled upon the recommendation to use security questions. There is even a dedicated page about what information to gather. Whenever I ...
19
votes
3answers
6k views

How secure is 7z encryption?

I have a text file in which I store all my bank details. I compress and encrypt it with 7-Zip using the following parameters: Compression parameters: Archive format: 7z Compression level: ...
5
votes
15answers
5k views

Preventing registered users from sharing passwords [closed]

Below is a proposal for dealing with a situation of website security. I am wondering whether it seems feasible, from both a technical and usability point of view. I want to make sure that the proposal ...
0
votes
1answer
54 views

Two reset password tokens used for the same reset password flow

I've a question regarding a forgotten password flow. Basically I'm sending the password reset token out-of-band to the user, and then the user sends it back with the first request via querystring, I ...
3
votes
3answers
102 views

Implement a passcode to authenticate app users [duplicate]

This question is related to this one. We're busy implementing 5 digit passcode authentication for our app (Android, iPhone), but we're running into a complexity. We're unsure how we can safely ...
1
vote
1answer
158 views

WordPress is asking for my FTP password to update. Is this official behavior or am I compromised?

I'm running a personal WordPress server and I have 3 pending updates: WP update from 4.2.2 to 4.3.1. Akismet plugin update to 3.1.5 which addresses XSS issues. Twenty-fifteen theme update. For ...
4
votes
0answers
21 views

How to securely send your user and hashed password to a server? [duplicate]

I'm making a user system for an app I'm developing, and I have a client side (the mobile app itself) and a server side (where the database remains) for it. The app sends get and post petitions to the ...
1
vote
0answers
95 views

How secure is Asus router latest framework function: “Added protection mechanism for GUI login brute-force attack for login username and password.”?

I have just updated my RT-N12 D1 router to the latest framework, and it has new function - "Added protection mechanism for GUI login brute-force attack for login username and password.". I Googled and ...
-1
votes
2answers
191 views

Using a password hash…as the password? [duplicate]

Ok, this is probably a really stupid idea, but I can't really see why it would be a bad idea. Maybe someone can enlighten me. Why couldn't you enter a password good hashing algorithm like bcrypt, ...
2
votes
1answer
102 views

Login on public Wi-Fi networks using HTTPS [duplicate]

Is it safe to log in to my e-mail account with my iPad's Safari through a public Wi-Fi network (let's suppose someone is eavesdropping the traffic) provided that the e-mail provider uses HTTPS?
5
votes
3answers
260 views

Did I miss any vulns here?

I recently took a beating in a Security Engineer interview and I did not get any specific feedback on how I did. I'd like to re-ask the question to the community so I can polish up on these elements. ...
0
votes
2answers
60 views

Is it insecure to temporarily save user's data in a session while they register?

My plan is to save the registration, as they go along so if they close the page by accident they will still have all of there information saved so they can continue it again. But my question is it ...
79
votes
8answers
9k views

Why should you redirect the user to a login page after a password reset?

The OWASP Forgot Password Cheat Sheet suggests: Whenever a successful password reset occurs, the session should be invalidated and the user redirected to the login page I'm failing to understand ...
1
vote
0answers
326 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 ...
12
votes
5answers
9k views

How do online accounts get hacked?

How does your typical users run-of-the-mill Facebook/twitter/gmail/AIM/etc account get hacked? Is it simply a matter of a weak password? Are they typically the victim of phishing or other social ...
1
vote
2answers
145 views

Does using NATO's phonetic alphabet increase password strength?

Given an alphanumeric password intended to be strong yet easy to remember, we change each alphabetic character by its NATO alphabet counterpart (e.g. 'cat' becomes 'charliealphatango'). I understand ...
-1
votes
1answer
139 views

Is it okay to have a blank root password for MySQL if port 3306 is not forwarded?

I'm running a PHP server that will use the root account to access the database. However, the server is behind a router and port 3306 is not port forwarded. Is it okay to have a blank password for the ...
10
votes
4answers
413 views

Why do websites store passwords' hashes not their ciphertexts?

Every time we discuss passwords and hashing functions posters immediately bring up how hashing functions can be cracked and we should avoid MD5 .. etc Hence we have use strong passwords and salt and ...
12
votes
7answers
2k views

Why don't we reward users who choose strong passwords? [closed]

Suppose there is a web property that has some sort of reward system or commodity that its users desire. It could be reputation on Stack Exchange-like sites, rank badges on message boards, or add-on ...
1
vote
2answers
212 views

Is Linux getting less or more secure? [closed]

The famous so-called virus-and-hacker-free Mac is a thing of the past: As it gets more popular it gets more vulnerabilities. Will Linux be the same at some point in time? Is it getting less of more ...
3
votes
1answer
97 views

LastPass Key Derivation Security Question

I have done some research about password managers and of course stumbled upon LastPass. There are plenty of questions and answers about the security of LastPass, but as far as I am aware none of them ...
3
votes
1answer
34 views

Adding HTTPS API to legacy hardware system that uses short numeric passwords

I work with a hardware system that traditionally authenticates users by the entry of a short numeric password on a physical keypad. Despite the small password entropy, this system has proven to be ...
0
votes
0answers
36 views

Is it appropriate to request a bounty for finding exploit on major site? [duplicate]

Long story short, I found an easily reproducible, very easy, and honestly embarrassing exploit on a major (yes, major) financial institution's online banking site today. It's not directly tied to ...
85
votes
11answers
16k 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 ...
2
votes
2answers
182 views

Log User In Automatically After Clicking Account Activation Email

Scenario: Forum account registrations, user must click an activation email after they sign up e.g. they create an account with username, email, password, and an email is sent to the email they select. ...
3
votes
1answer
110 views

Password security and entropy - degeneracy question

I have written a short password generator which uses a mixture of words from a dictionary and randomly generated passwords, and I'm wondering if I did the entropy calculations correctly. Usually I use ...
16
votes
4answers
1k views

How are browser saved passwords vulnerable?

Most browsers offer to save the password after entering it on many logon pages. What types of vulnerabilities are there for such saved passwords. I'm interested in what ways malware on web pages ...
3
votes
1answer
80 views

Using the password, among other values, as key data in two-factor authentication

I'm writing an implementation and a thesis about two-factor authentication, and am currently doing some research. I'm currently looking at an implementation for deterministically generating a ...
3
votes
4answers
4k views

Yahoo Email Keeps Getting Phished

I keep getting spam emails from myself (and I am sending them to others as well) on my Yahoo Mail account. I have already went through two password changes which I thought were secure. My very last ...
2
votes
4answers
139 views

Is it a good idea to to use secure_hashing_function(mypassword.url) as my password? [duplicate]

Like many users it's very difficult for me to use a different password for every website I have an account with. It does not matter how complex my password is if ONE naive website stored it in clear ...
3
votes
5answers
2k views

Password protect an excel file for a period of time?

I'm trying to find a way to password protect an Excel file (.xlsm) beyond the built-in password encryption options. Ideally: Enter the password File works for a week(/other period of time) After a ...
5
votes
1answer
981 views

Should I be worried about brute-forcing passwords that encrypts AES?

I am building an application that needs to locally store sensitive data, that is encrypted using the sha256 of a password provided by the user. It uses AES for encryption. I am worried that some ...
41
votes
10answers
7k views

What type of pattern should I use for my passwords?

I have a lot of accounts and until some time ago I used an universal password for all of them. Right now I have a different password for every account depending on the website name that I am logging ...
5
votes
1answer
586 views

YubiKey or Google authenticator?

I'm using lastpass and I would like to implement a 2FA in my account, but I don't know which one is the most secure, a software authenticator such as google authenticator or an USB device as Yubikey. ...
0
votes
1answer
304 views

Is it possible to recover a Diskcryptor volume password?

Must admit to being dumb: I have encrypted one partition from my external hard drive with the AES-Twofish-Serpent algorithm and used a key file with a password. My PC ran into a problem and now the ...
3
votes
2answers
7k views

How long it will take to crack a RAR password?

I wonder how long it will take to crack 16 character alphanumeric WinRAR password for a mini supercomputer. As far as I know graphic cards are preferred over CPUs to crack passwords nowadays. If we ...
0
votes
1answer
116 views

Can you do a client and server side encryption [duplicate]

I am creating a PHP website where users, among other things, can login and do administrative stuff. For their passwords i use password_hash($password) and to later verify with it, I use ...
11
votes
4answers
2k views

Why will Google no longer allow me to end or begin passwords with a space? [closed]

Why won't Google allow me to use a password ending in a space anymore? Backstory: I have memorized a cipher that allows me to generate a different and very strong password across many different ...
2
votes
2answers
91 views

Password generation based on hash of master password + suffix?

Is this [1] a secure and reasonable way to generate a unique password for login on various websites? echo -n my_strong_master_password#website.com | sha1sum Of course, if my system is compromised ...
59
votes
8answers
11k views

Is password reuse a problem if the password is very strong?

I always read that using the same password on multiple sites is a risk. I'm wondering what is the real reason for this? In my case, I use the same password on multiple sites everywhere. My password ...
-1
votes
1answer
43 views

Quantum Computation and its threats [duplicate]

Since Quantum Computers has potential to become super computers of next generation. will that make cryptography obsolete..?
5
votes
3answers
364 views

Can using emojis make someone's password safer?

I was just thinking about this the other day, after reading about making safe passwords, you have a few options: The first would be, adding numbers, or something other than just a word ...
20
votes
8answers
3k views

Why should I hash passwords?

I've read that every good web application should hash passwords. I found many articles about hashing. So I started implementing hashing on my website and then I asked myself why should I do it? When a ...
2
votes
1answer
120 views

OTP on the same device being used to login

I've seen mobile apps use two factor authentication by sending an SMS to the mobile phone. However, if I've stolen someone's phone, where is the security advantage? I can understand it if it's used in ...
16
votes
4answers
10k views

SSH key auth, but still need password for sudo?

SSH with public-private key authentication comes enabled by default with most Linux distributions. This is great because when I create accounts for remote users I don't have to email them sensitive ...
-2
votes
1answer
119 views

How MD5 and salt algorithms come into play if the attacker uses curl?

When the user logs into any site, they supply a username ('user01') and password ('password123') into a form then submit. The user has no idea what their hashed password value is that is stored in the ...
44
votes
4answers
3k views

Is using bcrypt on existing SHA1 hashes good enough when switching password implementation?

I'm working on improving a CMS where the current implementation of storing password is just sha1(password). I explained to my boss that doing it that way is incredibly insecure, and told him that we ...