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

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29
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3answers
8k views

How can I create a password that says “SALT ME!” when hashed?

How can I create a password, which when directly hashed (without any salt) with md5 will return a string containing the 8 characters "SALT ME!". The hope is that a naive developer browsing through his ...
2
votes
2answers
53 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 ...
1
vote
1answer
98 views

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

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 ...
2
votes
1answer
108 views

File Fault 1 password from memory dump

I have a osx 10.9 machine with a File Vault1 encrypted user partition. I would like to remove the encryption, but I don't remember the "master key" which is the only way to remove encryption ...
0
votes
2answers
75 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 ...
0
votes
2answers
136 views

How different should passwords be?

It seems to be generally accepted the same password should not be used for different sites or devices. How different should passwords be? For example +_^gum<JW1 and +_^gum<JW2 are very similar. ...
5
votes
1answer
4k views

Recover Server 2008 R2 Domain Admin Password

So I did the ultimate silly thing: I lost my domain admin password for my Server 2008 R2 box. Sure, I could just re-install but that's going to be a huge pain. I tried rebooting with the Windows ...
1
vote
1answer
39 views

How do you manage credentials to multiple remote systems?

We are a vendor that provides software to the healthcare industry, and our application is locally hosted on customer infrastructure. As such, we are provided with VPN access in order to be able to ...
0
votes
1answer
261 views

What happens if you run out of password attempts?

In Samsung Knox, you have 20 password attempts. However, it is never explained what happens if you run out of attempts. Does it delete your Knox data, do you need to enter the recovery PIN or is it ...
1
vote
1answer
72 views

FIPS 140-2 C# Password Hash

Is the following algorithm, using RNGCryptoServiceProvider & Rfc2898DeriveBytes, sufficient to implement a FIPS 140-2 password hash on Windows Server 2008R2? var provider = new ...
1
vote
1answer
58 views

NTLM/LM Hashes on Domain Controller

I've noticed that when extracting password hashes from a domain controller (using Elcomsoft proactive password auditor) sometimes I'll get LM and NTLM hashes and other times I'll only get NTLM hashes. ...
3
votes
2answers
348 views

Does bcrypt compare the hashes in “length-constant” time?

I saw this function slowEquals() while reading Salted Password Hashing - Doing it Right, which uses a byte-level xor comparison to avoid timing attacks. I was wondering whether this is what Bcrypt ...
0
votes
0answers
21 views

Length-constant password comparison in scrypt? [duplicate]

E.g.: XORing the candidate against stored then comparing against 0. Do I need to worry? (my question is much in the same style as this question: Does bcrypt compare the hashes in ...
52
votes
12answers
8k views

How reliable is a password strength checker?

I've tested the tool from Microsoft available here which tests password strength and rates them. For a password such as "i am going to have lunch tonight", the tool rates it's strength as "BEST" and ...
2
votes
2answers
106 views

Chinese or “pinyin” wordlists for dictionary attacks

Background: I am currently trying to crack a salted md5 hash which I have recovered from an embedded device running busybox and manufactured in china. I have tried john the ripper using all of the ...
1
vote
3answers
148 views

Time Memory Trade-Off Attacks

Given, we want to crack a password. With Time Memory Trade-Off Attacks one tries to find the right balance between time to compute hashes for all possible passwords. And the used memory to store all ...
1
vote
1answer
55 views

Cracking encrypted SQB databases

I've recovered a .SQB SQL database backup file from a backup server and do not have the password. As I do not have the password available to me, I'm looking to determine what type of encryption is ...
13
votes
5answers
4k views

Is saving passwords in Chrome as safe as using LastPass if you leave it signed in?

Justin Schuh defended Google's reasoning in the wake of this post detailing the "discovery" (sic) that passwords saved in the Chrome password manager can be viewed in plaintext. Let me just directly ...
3
votes
1answer
116 views

API to change passwords?

After I learned last week that the login data of some of my accounts was leaked, I had to change my passwords for more than 30 sites. That was tedious! As luck would have it, some days later we ...
10
votes
6answers
1k 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 ...
1
vote
1answer
53 views

Hashing password for secure storage (generating salt)

I wanted to check if the following means of generating a hash for storage of a password was secure. I have an username and password combo. In order to generate a secure hash, I am doing the ...
5
votes
1answer
85 views

What happens if biometric data is stolen?

As we move toward a future where fingerprints might possibly replace passwords, I see one issue. While passwords can be stolen, they can be changed by the owner after being notified of the security ...
1
vote
1answer
68 views

What to do with .hash files when cracking WPA2

So, I'd say I'm one level above n00b. I've gotten to the point where I have accomplished a WPA Handshake (and saved the output as xxx-01.cap). I have also downloaded these hash tables (if that is the ...
0
votes
1answer
40 views

CNN Money Portfolio and Heartbleed [duplicate]

Is/was CNN Money Portfolio ever vulnerable to heartbleed? It states 256 bit SSL bank level encryption on the website..
5
votes
2answers
266 views

TPM- Symmetric key storage

I understand that the TPM can be used to store an unlimited number of keys. However I am left with a few questions: Presuming the TPM is connected on the LPC what protects the data travelling across ...
3
votes
0answers
123 views

Decrypt Passwords based on using a user's password

I am creating a database to store our client's information at work (a heritage center specializing in DNA based genealogy). Once the results of a test come back, we have people that use the ...
20
votes
4answers
8k views

Should I change all my passwords due to heartbleed [duplicate]

Should I change all of my online passwords due to the heartbleed bug? Edit: I found a list of vulnerable sites on GitHub and checked all my critical sites. Everything I was really concerned with ...
1
vote
1answer
24 views

Save application autostart login token on computer

I need to login desktop application while autostart on server (like skype does). What is the best practice to save authentication token (password)? Should I use something like RSA encryption (which ...
1
vote
1answer
41 views

Is it safe to sign in to Google with password from desktop app like BlueStacks? [closed]

BlueStacks is an android simulator for desktop. After installation it will ask you to login with your Google account to download and install android app from play-store. My question is "Is it safe to ...
0
votes
0answers
59 views

Brute-Force/Dictionary attack against encypted file using PBKDF2 key derivation

I have been following this very useful post by Thomas. My use case is slightly different. I am developing a mobile application which requires some sensitive data to be stored on the device in a SQLite ...
0
votes
2answers
107 views

If bruteforcing a password goes aaa, AAA, aab, AAB, etc, all the way to ZZZ, wouldn't ZZZZZZ be the most secure password?

I'm only taking about security against bruteforce attacks. I assume that most crackers start at a and go up to zzzzzzz for as long as instructed (so it could be zzzzzzzzzzz if told so in the ...
0
votes
1answer
189 views

The Problem with Changing All Passwords for HeartBleed [duplicate]

One thing that's been bugging me in relation to the discovery of the Heartbleed OpenSSL flaw is the recommendation that everyone should run to their computers in a panic and change all of their ...
28
votes
8answers
2k views

Why improvising your own Hash function out of existing hash functions is so bad

I'm afraid I'll have tomatoes thrown at me for asking this old question, but here goes. After reading that cooking up your own password hash out of existing hashing functions is dangerous over and ...
0
votes
1answer
45 views

Securing passwords for REST Authentication

first post on sec so go easy. I'm developing a REST application using the Spring Framework, as as part of the requirements, we have to secure the different functions of the system to different user ...
3
votes
3answers
511 views

Encrypting passwords?

I am planning on creating a text file to store my passwords, so I only need to remember 1 password (at the moment, I have about 20 long/complex passwords in my mind, and am worried that I might forget ...
20
votes
4answers
5k 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 ...
3
votes
1answer
106 views

Password Managers: encrypted database vs hashing strategy

I'm considering moving to a password-management strategy based on supergenpass or something similar. This is an alternative to other password managers where instead of having a database of passwords ...
8
votes
3answers
485 views

Is it safe to generate passwords online?

I usually generate strong passwords using various online tools. Some time ago I mentioned it to friend of mine and he looked at me as if my life was one big fail. Is it really so unsafe to generate ...
1
vote
1answer
190 views

I login to Stackoverflow (vulnerable) with Google (not vulnerable). Do I need to change my password? [duplicate]

According to this heartbleed mass test, Stack Overflow is vulnerable whereas google is not. I use my Google ID to logon to Stack Overflow (and some other sites). Do I need to change my password? In ...
16
votes
2answers
544 views

Bank accepts different password to the one that I set

I'm not particularly well versed in IT security so please bear with me. I recently discovered that my bank's online system will accept passwords that consist of the correct password, and a string of ...
21
votes
6answers
17k views

How safe are password managers like LastPass?

I use LastPass to store and use my passwords, so I do not have duplicate passwords even if I have to register four to five different accounts a day, and the passwords are long. How safe are password ...
2
votes
5answers
968 views

Hardware USB Key to Reset Any Windows Password

This tool requires physical access of course, and there are many things you can do once you have physical access, but this peaked my curiosity. The tool in question: ...
1
vote
2answers
98 views

LastPass login security

If LastPass does not store your master password, then how can you login to use their web app? Surely you must type it in, it is sent over using SSL, and then salted/hashed on the server-side, and ...
2
votes
1answer
33 views

Windows Scheduled Task passwords

When you create a Scheduled Task in Windows, it gives you the option of running the task as a different user, including saving the password. How secure is the password that is stored?
41
votes
1answer
6k views

What should end-users do about Heartbleed?

What should one do about the Heartbleed OpenSSL exploit? mainly talks about what people running websites should do about Heartbleed. What should end-users of websites be doing? Do they need to ...
0
votes
1answer
28 views

Handling passwords in wicket

I have a form which contains a password field. In swing the getPassword() method returns a character array. After the password has been processed by my web application the array can be wiped to ...
0
votes
1answer
37 views

Is there an anti virus that protects processes from being injected code to?

As title says, is there an av that does that? And if not, is there any other program that protects processes like lsass in windows, apart from protected process utility in win8.1?
1
vote
0answers
29 views

Digital signature based authentication schema using two passwords

I'm working on an authentication system for a web based Bitcoin-related service. As part of the service, users do some less sensitive operations (mostly reading and sending various types of ...
3
votes
0answers
83 views

Is BSI’s process good? (Informing email address owners that their address/password (of unknown/different accounts) was stolen)

The German BSI (Federal Office for Information Security) claims to have got a list of 18 million email addresses and passwords – supposed to be the result of identity theft. They allow to check if ...
1
vote
1answer
60 views

Is there an equation to calculate the number of instances of a series of characters exist in a given key space?

If I'm using 16-18 character-length passwords with 94 different possible values-per-character (lower alphas, upper alphas, numbers, and special characters), is there an equation I can use to calculate ...