Tagged Questions

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

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0
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0answers
16 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 ...
3
votes
1answer
49 views

Best way to store/retrieve sensitive key files?

We have our web servers running in AWS EC2. We have about 30 API Keys/passwords/etc (sensitive data) which is set in the environment for our app to use. Whenever we deploy, we start a new server ...
1
vote
1answer
60 views

Perfectly Robust Hashing Scheme, or Completely Over-Engineered?

This is going to get long, so prepare. Basis of the question is, Do all these steps improve security, or am I completely overthinking the problem? Are my assumptions/thought process valid? We all ...
0
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2answers
44 views

What is the solution for handling exceptions in password hashing schemes?

There is a technique called password hashing that describes creating unique passwords based on a unique master key and a static and arbitrary hash value. Using this technique, the user only has to ...
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5answers
232 views

How to deal with password schemes that can produce weak passwords?

Introduction Since the xkcd note on password strength, there has been a lot of attention for password entropy. However, this raised the question: what if you used a strong scheme, but happened to ...
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0answers
38 views

What encryption or hashing algorithm is likely to be used here? [on hold]

I want to use the USERS table of a proprietary 3-rd party tool for user authentication. The column PASSWORD is of type VARCHAR(35). It holds the following data: 64783641124722847161648230000000000 ...
33
votes
8answers
6k views

Do bad passwords produce bad salted hashes?

When you have a password stored in a database that has been strongly hashed and salted does it really matter if the underlying user password is weak? If you setup features like limiting login ...
9
votes
8answers
1k views

Sequential password updates

Let's say I have a reasonable KDF, and that I make users change their passwords periodically and keep some old password hashes to prevent password reuse. What's to stop the user from changing the ...
0
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0answers
204 views

Is the password “Z” more secure than the password “a”? [duplicate]

Okay, I guess it's not possible to call one-letter-passwords "secure" - so let's compare ZZZZZZZZZZ with aaaaaaaaaa. Both are using the same character pool [A-z], so the number of combinations for a ...
1
vote
2answers
121 views

Should email verification be followed by password-based login? Why?

[This is a duplicate, considered off-topic at http://stackoverflow.com/questions/26564992/should-email-verification-be-followed-by-password-based-login-why] A typical account creation process seems ...
0
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0answers
45 views

oclHashcat error messag in Kali Linux

I am in the process of learning oclHashcat syntax. Currently, I am working on breaking a file of md5crypt strings with a dictionary file. The dictionary I am using is rockyou.txt from an installation ...
2
votes
0answers
137 views

Has a plaintext password ever been used in a court of law as evidence to a crime?

Regardless of how the password was obtained (decryption, bad hashing, confession): Are there any prior known cases where the contents of the password was used to prove motive or guilt? Or, looking ...
3
votes
3answers
134 views

Why require new users to change password?

I have noticed that it is common practice when setting up a user account (Windows users accounts and Google Apps user accounts in my case) to require new users to create their own password immediately ...
0
votes
2answers
89 views

Passwords: Symbols and length > 20 disallowed [duplicate]

I'm going through a bunch of accounts at the moment changing my passwords, some of them are looking a little weak and i've reused them, but i keep coming across websites that don't allow you to use ...
1
vote
2answers
72 views

Facebook security

I check my security settings (from my Facebook acc.) from time to time, and sometimes I see there are IP addresses which logged into my account but don't belong to me. When I look in the web who is ...
23
votes
11answers
4k views

One liner to create passwords in linux?

How do you create a readable password using bash with one line? What if i'm looking for 128 bits of entropy? EDIT By readable I mean the 94 printable ascii characters (without space). It can use ...
-1
votes
3answers
139 views

Gmail, Yahoo, Hotmail , and so on; How do they check the content of an attached password-protected archived file like Winrar?

How is it possible that mailing systems like Gmail, Yahoo, and Hotmail are able to check the content of an attached password-protected archived file like WINRAR, if the password cannot be guessed, ...
41
votes
6answers
3k views

Is the option to jump to blanks in password fields a security risk?

Using Ctrl + ← / →, it's a common behavior across different operating systems to jump from word to word (or from blank to blank) in text input fields. Now I've discovered that this also applies on ...
12
votes
6answers
2k views

What is the simplest safe way to convey a password to another person? [duplicate]

What is the easiest way for two people – neither of whom are computer specialists and cannot meet in person – to send a password for an encrypted file that is attached to an email? The two simplest ...
1
vote
4answers
80 views

Password recovery flow - Send Password recovery to any email?

I am building a new MVC app. Considering this "forgot password" flow: 1)You enter an email. 2)You press "send recovery password". 3)An email awaits in the inbox, pressing the link in it brings you to ...
2
votes
1answer
62 views

How to handle legacy website account login credentials

I have a lot (>1000) of credentials for website logins in my Chrome's password safe. Some of them are quite old (> 10 years) and have weak (dictionary) passwords. Some of the accounts have low value ...
1
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0answers
59 views

Database row level encryption scheme

I am wanting to secure some highly sensitive data in a database. This would mean that the data needs to be encrypted and remain secure for 100 years if it were to fall into adversary hands. I also ...
0
votes
3answers
106 views

One Less Password

I just came across this: https://blog.webmaker.org/one-less-password Basically a technique for eliminating passwords as the primary authentication mechanism for connecting to a website by replacing ...
1
vote
2answers
43 views

Would it better to enforce more complex passwords or passphrases? [duplicate]

I have read in different places that passphrases offer better security and are more user friendly however, I have also read contradictory information thats says longer passwords are not really more ...
-8
votes
1answer
88 views

I need help on how to hack into a scammer computer via IP/DNS [closed]

I really need your help in this one. Today I got scammed by a "trader" for 100$, but I managed to get his IP, reverse DNS and Hostname but I am unskilled in hacking. I need help here, I just want to ...
3
votes
0answers
69 views

Is it possible to retrieve SSH v2 credentials in a username/password authentication scheme?

I'm currently analysing a compromised network(root access has been gained to a workstation and logs show that it has been used for port scanning and service brute forcing attacks on the remaining ...
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votes
3answers
105 views

My friend hashes passwords with SHA512 algorithm without salt. How do I convince him that he needs to add salt?

Today I discovered something incredibly stupid - my friend hashes user passwords with sha512 algorithm without a salt. I immediately raised this issue to him but he said he wants to see anyone crack a ...
12
votes
4answers
3k views

Is an 80 bit password good enough for all practical purposes?

I know that asking how many bits of entropy comprise a strong password is rather like asking the length of a piece of string. But assuming the NSA is not on to you, and that it is hardly worthwhile ...
0
votes
1answer
44 views

Securely map random string to a custom charset

I'm writing a Python script to generate custom passwords based on a HMAC. I want the passwords to support various websites requirements so I want to map the HMAC output (ex: hex format) to an array of ...
1
vote
2answers
87 views

How to implement password reset functionality without becoming susceptible to cross-domain referer leakage?

I have typically implemented password reset functionality by sending a link that included something like this: http://example.com/pwreset?id=userId&resetToken=superSecretResetToken On my pwreset ...
0
votes
3answers
119 views

Can you have Secure encryption with a backdoor, and still be secure?

Is it possible to have an encryption algorithm/implementation that has a "backdoor", that also wouldn't introduce flaws into the encryption? For instance, if you have a master password, once that ...
3
votes
1answer
126 views

Windows system password hashed - see which hash is used

How can I know / see if my windows is using NTML, LM, NTML2 for its user account passwords? What is the standard today, in windows systems?
0
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0answers
78 views

Hydra sometimes fails against my own router known password

Hydra sometimes fails against my own router known password. Sometimes confirms it was found, and sometimes returns unusual error code (empty). What does this means? dione@saturno:~/misc$ hydra -l ...
0
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0answers
148 views

John the Ripper - Calculating brute force time to crack password

I'm using incremental mode (brute force) mode in John the Ripper to crack Linux MD5 passwords. I'm trying to calculate the time it will take to run through all combinations of 12 passwords (with 12 ...
3
votes
3answers
189 views

Is it ok for software to store passwords locally in plain-text?

There are already plenty of questions about what to do when websites store plain-text passwords. But this one is a little different. I use a piece of open-source (see below) software for playing ...
3
votes
3answers
475 views

Accepting other similar passwords when storing a salted, hashed password

If a website stores passwords as a salted hash, is it reasonable to accept similar passwords as correct? For example, given the password stackexchange, does it dramatically decrease security if the ...
5
votes
3answers
237 views

Calculating password hashes in the browser?

I just finally got into Keybase and was surprised to see this in the sign-up page: Shouldn't password stretching and hashing be done on the serverside, as we normally don't trust a client?
1
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0answers
44 views

Decentralised password recovery

Are there good/established techniques for password/key recovery in situations without a centralised service? For example: I can imagine a system where a recovery key is generated, split using secret ...
3
votes
3answers
120 views

Where are the user credentials stored when remember password is selected?

Provided a user has chosen the remember me option while logged in last time into a web application,how does the web application server identifies the user next time when he logs in? The credentials ...
7
votes
2answers
387 views

Does Outlook store plain-text passwords?

A long time ago when Microsoft changed my e-Mail from Hotmail to Outlook the password-interface said that I should only put in the first 16 chars of my password. But my password was longer before. So ...
1
vote
1answer
82 views

Is there any advantage in encrypting a password hash in my database?

I am hashing and storing the salt:hash of each user's password in our database. The web server is ASP.NET and the connection string to the database in web.config is encrypted using the IIS config ...
23
votes
2answers
3k views

Passwords in plaintext?

I'm doing some research on the App of my telephone operator. I started Burp Suite on my Mac in proxy mode, I opened up the App on my iPhone and started to sniff some traffic. I pressed the "login" ...
1
vote
1answer
40 views

How can I hide proprietary elements of test data in tests that are automatically run?

I am writing automated tests for a web application that will be run periodically over night, and I am running into a moderate security issue. In order to make the tests thorough, I am hoping to ...
3
votes
2answers
104 views

Storing the password database on offline server

This password database resides on the authentication server which is connected to the Internet. My question is that if the password database is stored on different server than the machine connected ...
4
votes
0answers
82 views

Does password-hashing “busy-work” need to be cryptographically secure

All modern password hashing schemes are deliberately designed to include a huge amount of "busy-work", to limit the speed with which an attacker would be able to conduct password hashing attempts. ...
1
vote
1answer
44 views

Use TOTP to prevent simulating requests

I'm developing an API system which provides functionalities for a game. Currently, we are using HMAC to prevent simulating requests (let's say, prevent hackers from simulating the game) but because we ...
1
vote
1answer
58 views

Password for XLS files

I am not sure if this is right place to ask this question. I have created an xls file to store all my password in it. lately I have uploaded same file on Google Drive to access it from remote ...
0
votes
1answer
74 views

Is PassFace Authentication System secure?

In the passface authentication system, whether the passfaces are selected by the users or assigned by the system? Is such system secure? How is user's passface stored on the server side?
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votes
1answer
50 views

Escape from <script> to cause a XSS (XSS when reflection is already under <script>) [duplicate]

I am trying my level best to solve this issue i am totally not able to create a XSS i still thinks it to be a vulnerability and i think it is exploitable. I am frustrated around it for 8 days . Please ...
2
votes
2answers
112 views

Password verification scheme (used in eg. MS Office) - more secure than just a hash?

Usual password verification schemes stores a salted password hash and the salt. If the hash is good and computational costly, it is considered secure. However an alternate version (used in Microsoft ...