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

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38
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2answers
5k views

Is it good practice to ban an IP address if too many login attempts are made from it?

Since an IP address does not necessarily represent a specific device, but probably a whole network/company/etc. does it at all make sense to block an IP address if there is a significant amount of ...
1
vote
1answer
117 views

Is there anyway to generate a SAM file?

I was wondering if it is possible to create a windows SAM file. I already tried using chntpw but it seems like it only works under a Redhat based linux, ie I was able to blank/change a Windows 7 ...
1
vote
1answer
166 views

Exploiting Writeable SNMP

So, I've come across a couple of devices that are using default writable community names for SNMP such as 'private' (on windows machines) and 'Secret c0de' (on Brocade switches). I'm aware of the ...
15
votes
2answers
561 views

Can client-side hashing reduce the denial-of-service risk with slow hashes?

When storing user's passwords that you need to verify against (but not use as plaintext) the current state of the art is: Hash the password Use a salt Use a slow hash function - bcrypt, scrypt, etc. ...
4
votes
3answers
216 views

Why use Keepass, etc. if all your passwords are in one place?

I'm a firm proponent of using a password manager like Keepass to generate and store secure passwords. I also encourage others to do the same. But there's always one person who says they'll never use ...
0
votes
1answer
227 views

How compromised should I assume my computer is?

I had turned ssh on a while ago to do some remote work. I was just looking over some netstat info when I noticed someone had established an ssh session with me D: I turned ssh off immediately and ...
0
votes
2answers
100 views

How secure would this method be considered for password storage

Ok I am currently storing the passwords in most secure way I could think of. With use of Encryption and Hash. The passwords are first generated by user as plain-text with minimum length of 6 ...
0
votes
2answers
323 views

Automated software hackers use to try passwords

Because of the eBay hacking, I had to go and look for other accounts that I have used the same password to change the passwords on those site as well. (I know that it's very bad to have same passwords ...
1
vote
3answers
136 views

Touch tone phone username and password

I just got off the phone with Fidelity, who manage the health benefits for the company where I work. Before talking to a person, I was prompted to enter my username and password on the numeric keypad: ...
2
votes
1answer
184 views

Any reason I shouldn't be salting and hashing before putting through bCrypt?

I've been reading up on password storage and such, and have come to the conclusion that I need to be using bCrypt. I've got an implementation working correctly, but I'm wondering the best way to move ...
0
votes
2answers
82 views

Precise measurement of password complexity

I am thinking on a system, which measures the complexity of a password not based on its entropy or compressibility, but with a simply sophisticated method. The measurement of the ...
1
vote
1answer
114 views

Challenge-response login without storing a password equivalent

A problem with many challenge-response login systems is that the server has to store a password equivalent. For example, if the server stores SHA1(salt + password), and an attacker captures that hash, ...
3
votes
3answers
194 views

How can a site know about insecure password?

I received an email from my web host recently that informed me I had an "insecure" password on one of my email accounts and that I had to change it. Their definition of what a secure password is as ...
14
votes
2answers
2k views

How many passwords does the average user know?

Looking for research on the count and complexity of passwords that an average user is actively using. Note: Also, just to be clear, by research, this is not a request for you to respond with an ...
1
vote
2answers
99 views

What impact do the frequency of password resets have on password reuse?

Wondering if there's any research behind the most common password reset cycle I've seen of 90-days, and if there's any research that gives any insight into how to optimize password resets to reduce ...
1
vote
3answers
109 views

Is it possible to have a high confidence that a password is not being reused?

Have a few thoughts on the topic, but the general gist is if a user inputs a new password, is it possible to have a high confidence that a password is not being reused elsewhere? By elsewhere, I mean ...
1
vote
1answer
80 views

Should a Mobile app able to check what password is locally saved via a user facing feature?

I'm working at a company who is currently working to secure their mobile app (iOS native) by adding check points to security sensitive screens on the device (data is stored in the iOS keychain). User ...
171
votes
7answers
37k views

Why would you not permit Q or Z in passwords?

Jetblue's password requirements specify that, among other stringent requirements: Cannot contain a Q or Z I can't fathom a logical reason for this, unless it were say, extremely common for the ...
3
votes
0answers
446 views

A Google owned IP address accessed my outlook account [closed]

Today I got a warning from Microsoft saying that there was unusual activity on my account. Diving deeper I saw that there was a successful sign in from a Google owned IP address (according to ARIN). ...
3
votes
2answers
153 views

MySQL ENCRYPT salt is not random?

I know there's little reason to still use ENCRYPT() nowadays, what with bcrypt being almost ubiquitous and MySQL providing better hashes such as SHA1. But while dabbling with ENCRYPT() on MySQL ...
2
votes
1answer
544 views

Hydra bruteforce and JSON

I am having problems with Hydra and a JSON payload. The login request (intercepted with Fiddler), is the following: POST http://architectureservice.test.com/api/v1/login HTTP/1.1 Host: ...
3
votes
1answer
104 views

How does “Google password monitoring” work?

Google Apps has a feature to monitor users' password strength and notify administrator about it. Google help says: View the length of each user's password along with a graph showing its relative ...
3
votes
2answers
1k views

Is it a good idea to store Email addresses as hash only?

I am currently building a web service at http://write-math.com similar to http://detexify.kirelabs.org/ that should help users to get LaTeX code from drawn formulae. It is part of my bachelors thesis ...
1
vote
3answers
69 views

Is it ok to use the same password for many services with two-factor authentication?

Let's say that I've a relatively strong password, but I don't want to use many different passwords for each different service, and let's say that those services provide two-factor authentication using ...
8
votes
3answers
1k views

Logging “password with counter” use

When prompted to update their passwords after they've become stale (whether that's after 30, 60, 90 days — whatever is implemented by policy), many users simply increment the number that they may have ...
0
votes
0answers
55 views

How does restoring lost password with generated pin and help from service line work?

How does this procedure work: http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/175000/FA175815/en_US/PLC%20Application%20-%20Forgot%20Password.pdf In short: ...
42
votes
3answers
8k views

Paypal sent an email addressing me with one of my old passwords as my name

I got this email from service@intl.paypal.com, with the title: Your account has been limited until we hear from you. I think this is a scam / spoof email because I don't see any notification in my ...
0
votes
2answers
269 views

Are passwords safe to send through POST, without SSL in a iOS app?

Is it safe to post passwords to my web server in this manner? NSURL *url=[NSURL URLWithString:@"http://mywebsite/test/register.php"]; NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding ...
2
votes
1answer
125 views

Hashed passwords for NTLM authentication

I understood that Windows users' password hashes can be exported very easily. Right? So my question is: If I can have the hashes of other user accounts (e.g. local users on my Windows machine), isn't ...
7
votes
1answer
326 views

How to stop password recovery attempts on accounts?

I am using social networking services such as My Banking GMail PayPal Facebook Twitter Google+ LinkedIn All of these services text messages me a six digit code to login from anywhere, even a ...
0
votes
1answer
112 views

Multi user symmetric key encryption

I realize SIMILAR questions have been asked before but I'm looking for certain specifics I can't seem to find elsewhere. The following question closely resembles mine but falls short for me on ...
6
votes
1answer
156 views

How important is a mysql password for localhost?

We can assume that if an attacker gained access to a web server running mysql that they would be capable of reading the scripts to determine the mysql password. If mysql only responds on localhost, ...
9
votes
6answers
2k views

Should I hash a password if it is randomly generated

The best practice is we should hash a user password using algorithms such as bcrpyt to protect the user, however, given the following conditions, is hashing in the backend still matters? the ...
0
votes
4answers
133 views

Password Hashing Without a Unique Salt

I have a question about password hashing. This is not a question about the the BEST POSSIBLE method of hashing passwords, but rather a more utilitarian question about what is sufficient to hash a ...
1
vote
3answers
106 views

Issuing password information by phone [duplicate]

We have a confidential portal for clients. Historically they have been identified face to face in person and handed a unique token number that is associated with their email address and allows them ...
0
votes
1answer
45 views

Is it safe to use the Keccak Algorithm to create the Key for a Serpent cipher?

I like to store some configuration but would encrypt them with the Serpent cipher. Is it safe to do this? When not, what is a better solution?
1
vote
2answers
123 views

Forced to use using 2-Step Authentication to keep online profiles safe?

I am starting to see a majority of services, websites, and social networks offering the 2-step Authentication like crazy now to protect their users. Also, after reading how the Twitter Account N was ...
2
votes
1answer
90 views

encfs and passwords

I notice that encfs fails to mount a filesystem when a wrong password is entered. However, this capability of detecting whether a password is right or wrong can allow brute-force attacks to be ...
2
votes
1answer
350 views

How do application specific passwords work in Google accounts? [duplicate]

I turned on 2-step verification and had to setup an application specific password for Outlook. I noticed the password generated is actually weaker than the one I had before turning on 2-step ...
1
vote
1answer
164 views

how to use hash passwords to retrieve keys from keystore or access database

How do I hash the password for a keystore? How do I then use the hash to retrieve something from keystore? Similarly, how do I use a hashed password for accessing the database? I have encrypted the ...
1
vote
2answers
78 views

cleartext passphrase for keystore

How is passphrase for a keystore to be stored? we have all passwords encrypted and the key to encrypt is stored in keystore , so how is the passphrase for the keystore to be stored? in clear text? if ...
2
votes
2answers
196 views

Is it important to use a slow hash in htpasswd?

It's my understanding that the purpose of .htpasswd files is to restrict access to some files in the server filesystem. If an attacker gains access to it, he probably has access to everything else ...
-3
votes
3answers
136 views

Hashing credentials. Is hash(email+password) secure enough?

I am working on a client server application where to identify each user I was thinking of storing a single database entry: hash(email + password) In my opinion, this is enough to stop some known ...
2
votes
3answers
231 views

I want to roll my personal cloud hosted Password Manager using pass. How secure/insecure would this be?

I've come to the conclusion that I need to up my security. I currently have a dozen memorized passwords I use for every device and website. I'm against Keypass/Lastpass due to having to trust they ...
0
votes
1answer
92 views

What are the implications of an overly-restrictive password policy? [duplicate]

I came across an interesting password policy online recently: "Please be sure to enter a password that meets the following criteria: must be 8 characters long must not be based on dictionary words ...
2
votes
2answers
222 views

Wifi Sniffing Prevention

I share my wifi with my brother. Recently I came to know he is sniffing on my browsing. Is there a way I can prevent him from sniffing on my browsing? PS: I can't afford VPN.
1
vote
1answer
91 views

Amazon Turk - How secure is it? Strange behavior

I just had this really strange experience with Amazon Turk, where suddenly I was logged into someone else's account. I was logged into the company's Turk account, left my computer for a while, ...
2
votes
2answers
132 views

Does my brokerage/bank use poor password security measures?

I'm no expert. Could someone please tell me if I'm overreacting? After the Heartbleed news broke, I changed a lot of passwords. Here's what I discovered when changing the password on my all-in-one ...
3
votes
2answers
224 views

What should I do when I need to store passwords for usage in 3rd party software?

I have a desktop WPF application which authenticates with Dynamics CRM 2011. I ask for the username and password of the user and use them to connect to Dynamics CRM 2011 using ...
1
vote
2answers
209 views

Which hashing algorithm is ideal for use on the web? [duplicate]

I am new here, and have poked around the site looking for an overview of which hash algorithm to use on the web and why. It seems to be the consensus that SHA-256 or other SHA-2 family algorithms are ...