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

learn more… | top users | synonyms

-2
votes
4answers
115 views

Getting password cracking time and byte storage from bruteforce?

I am stuck with this question, you can see it in the picture I have included below. PARTS (a and b) I know a-z will be 26^8, A-Z will be 26^8 guesses, and 0-9 will be 10^8 guesses. But I can't relate ...
0
votes
1answer
132 views

What can hacker do, if he knows my SALTED password?

for example, in any website (WORDPRESS or etc..) they store passwords in database, using SALT mehtod (as i know)... for example: $P$dfwegfwegewgIT03.wewefefweg if hacker got this password and ...
12
votes
3answers
5k views

Is a HMAC-ed password is more secure than a bcrypt-ed or scrypt-ed password?

Given an option , which one should I choose , a HMAC for storing a password securely or a bcrypt or scrypt library?
1
vote
3answers
82 views

Password reset question answer complexity

I need to implement a password reset feature for a system that will be controlled by a security question and answer pair. The problem is that I can't guarantee I'll have a valid e-mail address or cell ...
4
votes
3answers
1k views

Why do some websites force users to come up with difficult passwords?

I can't understand why we commonly force users to come up with difficult to remember passwords. * Your password must contain at least one number, one uppercase character, and one special ...
2
votes
2answers
231 views

Temporarily save failed logins password hashes for using against brute force attack

My question is about online brute force attacks, that try to authenticate in the website. 1) For the first case if the requests are coming from the same ip, I think this are relatively easy as after ...
0
votes
1answer
76 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 ...
88
votes
6answers
30k views

Password Hashing add salt + pepper or is salt enough?

Please Note: I'm aware that the proper method for secure password storage hashing is either scrypt or bcrypt. This question isn't for implementation in actual software, it's for my own understanding. ...
3
votes
2answers
108 views

Is there any point in using two step authentication if you have strong passwords?

If you are in the habit of using strong passwords (randomly generated by password manager) is there any point in using two step authentication? Assuming that 99% of the time that when you enter a ...
3
votes
2answers
69 views

Why would you decouple your resource and login servers?

As described on this link, OAuth specifies that a login server and a resource server should be decoupled. The idea is that if one of your resource servers gets hacked, no password data is lost. All ...
87
votes
12answers
12k views

Technology that can survive a “Rubber-Hose attack”

In the documentary film Citizenfour, Edward Snowden says about documents: I'm comfortable in my technical ability to protect [documents]. I mean you could literally shoot me or torture me and ...
5
votes
2answers
108 views

Share root access without sharing password

I am looking for a way to share admin privileges on some hosts without providing the admin password. From his link, I was thinking of using a primary host from which every user can sudo -u user to ...
1
vote
3answers
437 views

Who should I give my password to [duplicate]

I've got a dilemma, should I give my password to my local IT help desk (I am seeing them face to face, and I know that they work for the same company as myself). They want to perform a routine ...
0
votes
1answer
45 views

MD5 before PBKDF2 on legacy software

I am mantaining a legacy software that uses MD5 in the following way: The client asks for a 16 byte salt when authenticating an account. The server generates a 16 byte salt, links it to the account ...
6
votes
3answers
218 views

Image file as password alternative

I seek guidance on interesting issue. Recently I've been searching for password alternatives, not because of the security, but to be more user-friendly. In one of my projects user receives 128 bits ...
22
votes
4answers
7k views

How secure is Windows 8's Picture Password login?

The final Windows 8 build has been released to manufacturing. One of the new features of Windows 8 is "Picture Password", where the end user logs on to Windows by clicking a specific pattern on the ...
2
votes
1answer
140 views

Why do major sites(Facebook, Google, etc) still send passwords unhashed? [duplicate]

QUICK SUMMARY: It seems like modern websites, for security's sake, should all have the client hash their own passwords before sending them to the server, who will rehash them, in order to avoid ...
1
vote
3answers
101 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 ...
16
votes
5answers
922 views

At what length does a password stop making sense?

I'm going to recommend that our users start using a password manager and start creating strong random passwords. Though I don't know what size of a password to recommend. Is it possible for a ...
2
votes
2answers
193 views

Is plain text over https really a good idea? [duplicate]

Sending plain text passwords over https is quite secure, the traffic is encrypted, making eavesdropping virtually impossible. However, once on the server side, it is still plain text. Of course, ...
2
votes
1answer
355 views

Is Google's password recovery by entering an old password a bad practice?

When you try and recover your password on Google, you will eventually stumble across this screen, and it made me wonder: Isn't this type of password recovery from Google essentially the same as ...
37
votes
7answers
7k views

Why isn't open WiFi encrypted?

As far as I understand, WiFi networks that require no password send traffic through the air unencrypted. Those that require a password encrypt each connection uniquely, even if they're all using the ...
0
votes
0answers
22 views

KeePassX and Dropbox [duplicate]

I am currently using KeePassX on Linux to allow me to have a different strong password for each website. With this program there comes two major inconveniences: I lose access to everything in the case ...
0
votes
1answer
99 views

Secure way to encrypt (not hash) passwords?

I'm building a system that for reasons I'll outline below, can't used hashed passwords, but I'd still like to encrypt them so that it's as hard as possible to crack them, in the (unlikely) event the ...
19
votes
4answers
944 views

Should I be concerned when a “Forgot Password?” tool sends my password in plaintext?

Some sites I have been a member of in the past don't go through the normal "Forgot Password?" process. Instead of e-mailing me a unique password reset link or something of the like, I have received ...
79
votes
4answers
17k views

Recommended # of iterations when using PKBDF2-SHA256?

I'm curious if anyone has any advice or points of reference when it comes to determining how many iterations is 'good enough' when using PBKDF2 (specifically with SHA-256). Certainly, 'good enough' is ...
0
votes
0answers
334 views

Thunderbird password decryption from the signons.sqlite and keys3.db without using any third party tools

I understand from the Mozilla documentations that the passwords are stored in the following two files which are located at ~/.thunderbird/*.default location: ( I use Ubuntu 13.10) signons.sqlite ...
1
vote
2answers
53 views

Should a password ever be presented in plain text to a user (On a website)? Is this illegal under UK Data protections act? [closed]

There is a website I use at work, external to our own. They have just presented with every employee with their plain text password and username via our internal website which requires our own logins. ...
93
votes
17answers
23k views

Is “password knocking” a good idea?

With port knocking, you have to "knock" on specific ports in defined order to expose a port on which service is running. How about password knocking? For example you have three passwords: A, B and C. ...
22
votes
7answers
6k views

Why don't people hash and salt usernames before storing them

Everyone knows that if they have a system that requires a password to log in, they should be storing a hashed & salted copy of the required password, rather than the password in plaintext. What I ...
12
votes
6answers
3k views

Do salts have to be random, or just unique and unknown?

First of all, my motive is to avoid storing the salt in the database as plain text. As far as this question is concerned, the salt is not stored in the database. After discussion in comments and in ...
60
votes
5answers
19k views

Is sending password to user email secure?

How secure is sending passwords through email to a user, since email isn't secured by HTTPS. What is the best way to secure it? Should i use encryption?
26
votes
8answers
2k views

Why is password hashing considered so important?

After reading this article, I can see the benefits of password hashing as a second layer of defence, in the event of an intruder gaining access to a password database. What I still don't understand is ...
31
votes
7answers
9k views

Is salting a hash really as secure as common knowledge implies?

(I did search on this topic, but I found no complete question/answer that addressed it, or even good portions of questions that might be relevant.) I'm implementing a salt function for user passwords ...
68
votes
3answers
22k views

How does Google Authenticator work?

Google Authenticator is an alternative to SMS for 2Step verification, installing an app on Android where the codes will be sent. It works without any connectivity; it even works on plane mode. This ...
7
votes
1answer
210 views

Are these SSH passwords of hacked servers?

I have been seeing persistent SSH connection attempts on my computer from a familiar IP address. I got curious and decided to do some Googling on the IP address. Turns out that someone from Indonesia ...
1
vote
1answer
44 views

Using a Cryptovariable with an API Designed for Human-Generated Passwords

I'm working with a vendor who provides an API with a user registration method clearly designed for human-generated passwords. We're calling the API in an offline server-to-server fashion, however, ...
29
votes
4answers
13k views

Standards for encrypting passwords in configuration files?

My workplace has a standard that plaintext passwords are not allowed in application configuration files. This makes enough sense on its face, in case someone gets access to the config files they ...
3
votes
3answers
14k views

Is it possible to brute force all 8 character passwords in an offline attack?

This article states: Brute-force techniques trying every possible combination of letters, numbers, and special characters had also succeeded at cracking all passwords of eight or fewer characters. ...
332
votes
11answers
63k views

How to securely hash passwords?

If I hash passwords before storing them in my database, is that sufficient to prevent them being recovered by anyone? I should point out that this relates only to retrieval directly from the ...
42
votes
4answers
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 ...
6
votes
1answer
273 views

Security of LastPass' password generator

I currently use LastPass for all of my password generation and management. After reading Diceware, I realized that LastPass' password generator might be insecure, as somebody could potentially ...
-2
votes
2answers
134 views

A Graphical Two-Step Authentication System [duplicate]

Changes made to system proposed in Two-factor authentication Without Mobile Phone: In previous system, shoulder surfing would reveal the user’s pre-decided image. In the current system, end image ...
2
votes
2answers
153 views

Storing lots of passwords that different levels of employees need access to

I am wondering what other people do for storing passwords. Our current model at my employer is fundamentally flawed in my opinion, so I am trying to see what other people do so I can select the best ...
4
votes
1answer
570 views

Is it a good idea to use two salts? [duplicate]

Is it a good idea to use two salts? This is implying that one would be unique to the user, and one would be unique to the server, using Bcrypt of course. So for example, if you're using Golang as ...
-2
votes
2answers
106 views

Password hashing and blowfish [duplicate]

What I'm about to say is probably going to make me look like an idiot but it's better to be wrong and learn than have unanswered questions. Ever since I started dealing with passwords I wondered what ...
0
votes
0answers
23 views

Best practise Managing Key Material Securely in Memory in android

I am aware of the issue of user entered pass phrases being left in memory if stored in Java Strings (due to String being immutable). Which takes me onto using char arrays. However, I am wondering if ...
2
votes
1answer
122 views

Is this a secure way to generate passwords at the command line?

Occasionally I need to generate a password while working at the Unix command line. I have the following alias in my zshrc: alias randpass='openssl rand -base64 32 | tr -d /=+ | cut -c -30' These ...
0
votes
1answer
101 views

Can Google's administrators be trusted with Google Authenticator? [duplicate]

Suppose there is an evil Google administrator who has full access to every server or network at Google. Will such a person be able to abuse the Google Authenticator technology to gain access to ...
3
votes
1answer
166 views

Best practices for passwords on registration?

I have a website which users register an account. On the registration field, the form fields are: Name Email Confirm email Username But there is no password field. When they hit submit, they are ...