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

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17
votes
7answers
1k views

Taking password letters not whole one, is this secure? [duplicate]

I found a site which is taking password letters from their users not the whole password. Is this secure? Or do they have saved password as salted hash (MD5)?
2
votes
2answers
51 views

Is encryption application credentials using certificate encryption good practice?

I'm working on a small web application. The web application needs access to a database, so the application needs access to a database username and password. The application runs in an environment ...
1
vote
3answers
123 views

securely storing passwords that can be retrieved

I'm trying to build a web application that can store passwords of other services like Facebook, Gmail ...etc. These passwords can be later retrieved and shown to the user. This has to be a web ...
0
votes
1answer
64 views

How does LastPass know that Microsoft.com uses the password for Live.com?

When I visit Microsoft.com, the LastPass dropdown lists my username/password for login.live.com. It does something similar for Playstation.com and several other sites. How does it know? Are these ...
0
votes
2answers
72 views

Store password in Public Domain using files and md5sum

Whenever I check integrity of a file using md5sum, I get a string of alphanumeric characters to compare and verify if it was downloaded correctly. Couldn't the concatenation of several of those ...
0
votes
0answers
29 views

Breaking EncFS given .encfs6.xml

I forgot the password of a EncFS folder (created, went to vacation, forgot). But I remember how the password was created (e.g. was a sequence of 4 dictionary words). So I decided to try to find the ...
3
votes
1answer
162 views

Would it be possible to add additional files to a password protected zip 2.0 file

I don't have the ability to determine/recover the master password for a production system that uses zip 2 archives. However, I need to be able to add new files to existing encrypted archives. There ...
31
votes
4answers
5k views

How does a hacker know how many times a password was hashed?

I've been reading a lot of questions about security and hash functions on this site and others. I am not an expert, just a curious mind and in my understanding the more iterations used to hash a ...
18
votes
3answers
3k views

Is a password in the clipboard vulnerable to attacks?

I see situations where you may have to input the same password more than once. You may type it in a text editor and copy it to clipboard, to paste it two or more times. In what scenarios this could ...
6
votes
6answers
43 views

Forgot password and revealing whether account exists [duplicate]

So when you hit that forgot password link and enter your email address, it seems that sites (and other programmers I've spoken to) are one of either two mindsets; Notify the user whether or not the ...
5
votes
3answers
79 views

Forgot password and revealing whether account exists

So when you hit that forgot password link and enter your email address, it seems that sites (and other programmers I've spoken to) are one of either two mindsets; Notify the user whether or not the ...
5
votes
1answer
1k views

What happens if an attacker steals my phone's IMEI number?

I have some questions regarding IMEI numbers and data and identity theft. While searching online I have found many conflicting answers regarding this topic and would like some clarification if ...
1
vote
2answers
106 views

Website sent me my new password (after reset) in clear text [duplicate]

I was resetting my password on a website and the website emailed me a new password in plain text rather than giving me a reset link to change the password myself. I logged back in and changed the ...
0
votes
3answers
112 views

Best way to securely send passwords from an application to a user operated server

I have the following situation: A user sets up a server that will have to receive login details. Other users then create accounts and login to this server. All this happens only over LAN. I'm ...
-4
votes
0answers
70 views

Am I in troubles? [closed]

So I've done a job as a game developer and as payment I chose an origin game (which costs aroung 20 dollars). To that end I've created a new blank email account and a new origin account. Both of those ...
2
votes
0answers
74 views

Impact if password is visible on interceptor in case even we deployed HTTPS [on hold]

Our application is on HTTPS but password is visible on interceptor while when we check it via Wireshark it's encrypted. Is there any risk in it? And what kind of impact it can have?. We provided the ...
0
votes
1answer
31 views

Is there any problem using empty salts with PBDKF for this purpose?

The aim is to generate a secure key for symmetric encryption. I have a master password, from which I want to generate the key for symmetric encryption, in order to encrypt other passwords. The idea ...
2
votes
3answers
114 views

Can a shim (a.k.a. polyfill) be installed in IE, FF, or Chrome without user knowledge, and can it read passwords entered by user on a login page?

The questions here are about shims in the 3 most commonly used browsers. A shim (also known as polyfill) is a piece of code (often JavaScript or Flash) implemented to augment the native API in a web ...
4
votes
0answers
164 views

Modern alternative for passwords [closed]

Today - I saw a question about passwords usage in cars. Have we developed anything besides passwords for IT? Is there are any other solution out there for my ...
3
votes
1answer
121 views

Writing your own John the Ripper module

I have a script in C, which is able to determine the password of certain data. It uses HMAC and RC4 algorithms to encrypt the given password and then compares that later to the given data. If they ...
2
votes
3answers
411 views

Password security with short passwords

I know that a long password is a good password. However, some sites require short passwords e.g. exactly 8 characters long. Under those limitations, what is a good method of creating and memorizing a ...
3
votes
1answer
98 views

Password security when connecting to ldap with rails application

How do you store a username/password securely in a rails app when using it for many ldap searches? The connection in the app requires ldap_bind_authenticate(Net::LDAP.new, username, password) ...
0
votes
2answers
73 views

How much stronger does a paragraph/sentence based password becomes with random characters added?

I was reading some questions on here regarding the correct horse battery staple method, and the conclusion was that, assuming any words in the list of most common English words, every word adds about ...
5
votes
2answers
129 views

How do you know if the bios has been compromised?

To secure my PC I have setup a BIOS password, preventing any access from a live-cd. Recently I've noticed that when the BIOS asks for my password, I just have to press Enter to boot. It doesn't work ...
26
votes
5answers
4k views

Password strength of random words and brainflayer

I have read from multiple sources that it might be better to have a password composed of several random words since this is easier to remember than a random sequence of characters. For example this ...
19
votes
4answers
4k views

Would allowing shorter passwords sometimes be more secure?

Does the act of requiring certain criteria for passwords make them easier to brute-force? It's always seemed to me that when websites limit the use of "insecure" passwords, it might make it easier ...
1
vote
2answers
133 views

Different password for each login - based on some variable

This might sound a silly question, but I was thinking this as and extra option(which is not required) mainly for advanced users, who want to protect their accounts even more. Lets consider that other ...
0
votes
1answer
138 views

Why enter again (or at the very least confirm) my email address when I click “Forgot password”?

In most, if not all, web forms for logging into a site, you have your forgot password link. When clicking the link, you get a new form (usually in a new page) either empty (!) or prefilled with the ...
3
votes
1answer
156 views

SIP Provider stores credentials, is it required for some SIP phones?

My SIP provider stores my SIP call time password as AES encrypted in stead of hashed. I understand that SIP authentication has the capability to NOT store the password, and in stead store a ...
5
votes
1answer
161 views

How to store/encrypt fingerprint?

Storing password is a no brainer : use a password hasher. But.. How do you proceed to store fingerprints securely on your server? Meaning that even if your server and all it's data is stolen, someone ...
1
vote
1answer
72 views

Gnome-keyring iteration count location

I know that Gnome-keyring hashes the master password between 1000 and 2000 times. It picks a random number. I would like to ask where it saves this number, what is the location of that file? As far as ...
0
votes
0answers
29 views

Trying to figure out the hashtype of this digest-auth htpasswd file

Simple question for y'all as i'm having some trouble identifying the hash type of this from a http digest file that I have setup for rutorrent on a apache2 server. Here's an example of what it looks ...
0
votes
1answer
43 views

Use PIN or Password [duplicate]

Which one is better, using PIN or password ? I want my app using PIN number to user login and register. Does not matter if I use PIN number only for user login and registration in my web application ? ...
3
votes
0answers
50 views

DRIVELOCK password [migrated]

I changed my computer user name and password. When I logged in it was still OK. But when I restarted again it did not accept my password, it says wrong password or incorrect. Then the IT department ...
1
vote
1answer
134 views

Using Tor browser to use YouTube and account security

YouTube is not available in my country, but I want to make an account on YouTube and use it. I'm not interested in protecting my identity. It is fine if anyone can monitor it. The thing I'm interested ...
4
votes
1answer
77 views

Protect password/authenticating during transit over (insecure) TCP socket for a game

Background I am designing a multi-player game with a single server that handles multiple worlds. Each player logs into the server initially before requesting which world to join. The server has a ...
1
vote
3answers
45 views

Hashing Algorithms Costs vs Sleep

I understand most of the concepts behind hashing password but this one still escapes me. I understand that you want the hash to take some time ( a couple milliseconds) so the attacker can't ...
16
votes
5answers
3k views

The AES Crypt implementation hashes a password 8192 times to generate the key. Is this necessary?

I'm considering encrypting some small files (hundreds of kb apiece) using the AES Crypt reference implementation. Looking at the source, it seems that the encryption key is derived from the IV and the ...
2
votes
1answer
135 views

Storing server generated passwords

There are some applications that generate passwords for you. Consider a case where you sign in via Facebook, the application (let's call it NEWAPP) verifies your sign in on the server using FB tokens ...
73
votes
13answers
21k views

Why do sites implement locking after three failed password attempts?

I know the reasoning behind not letting infinite password attempts - brute force attempts is not a meatspace weakness, but a problem with computer security - but where did they get the number three ...
2
votes
3answers
206 views

Passwords propagation, Password Trend and Word Generator in Human Mind

Some passwords like "123456", "admin" are outrageously popular, so are the leet transformations and concatenation of digits. The users seem to pick up the password suggestions or just copy the ...
0
votes
3answers
71 views

Is using my phone number as a pin for a phone a security risk?

I just did a factory reset on my smartphone to see if it might fix issues with battery life. I configured a phone number as the lock screen code so I have a code that's both long and easy to remember. ...
4
votes
3answers
84 views

2-Factor Authentication vs Security Questions

I have an account with a bank that has additional security option. When it does not recognize a device being used to access the account, it will either: Prompt with 1 of 3 security questions Send a ...
2
votes
2answers
69 views

Justifying strong 1st factor in the context of multi factor authentication — beyond passwords

I am wondering if you need strong 1st factor (for theoretical correctness, please note it is the knowledge factor -- not necessarily a password, but definitely also includes strong passwords)? What ...
3
votes
4answers
154 views

Does manipulating a random password significantly reduce its entropy?

Suppose I generate a password using a secure random number generator and all the available character classes. For example, c.hK=~}~$Nc!]vFp9CgE. Consider that this password may need to be used in an ...
-5
votes
1answer
82 views

Time-based password change [closed]

I have created this script and it runs great, but important questions remain. Is this script useful and secure? Does it have any possible problem or weakness? root@010010:/# ls -la ...
1
vote
1answer
129 views

Windows Passwords

What are the security concerns of the following user account setups on a normal Windows 7/8/10 desktop machine compared to: Using a non-privileged account with a password and having an admin account ...
2
votes
1answer
111 views

Is it safe to use a 4-digit PIN for Android system encryption?

I just encrypted my Android phone using the default menu. I was asked for a PIN code (4 digits). Do you think this is a good practice? Is there a limited number of attempts at decrypting the ...
9
votes
2answers
210 views

Is it possible to guess the length of a password by sniffing TLS packets?

In this answer, the author states that it is possible to tell the length of your password, by sniffing your TLS packets. Is this true, and how would this be done in practice?
5
votes
2answers
262 views

Password: ham,ham,ham,bacon,bacon,ham

Why do we bother with dice ware? Is rolling dice and looking up in a printed book (or using a digital analogue) a string of N random words any more secure than simply repeating a word or two N times? ...