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

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2
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1answer
124 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
vote
0answers
224 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
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3answers
145 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
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2answers
88 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 ...
-9
votes
1answer
224 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 ...
4
votes
2answers
4k views

How does Authy's 2FA work, if it doesn't connect to the server?

I thought I knew how two-factor authentication works: I enter the password. Server generates a random number (token) and sends it to me via SMS. I enter this token. Server checks that the token I ...
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 ...
5
votes
1answer
868 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 ...
-2
votes
3answers
302 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 ...
11
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6answers
634 views

Security of carrying passwords on person

While in college I decided to have a randomly generated 16 character password. I used parts of that password in various sites. However, one of the sites was compromised so I had to change my password. ...
2
votes
1answer
323 views

Is there more risk in changing administrator password locally vs from a centralized location?

I'm working on a mechanism to better handle group policy passwords in response to MS14-025. We formerly used this mechanism for setting the local admin account passwords on our workstations (primarily ...
1
vote
1answer
2k views

Due to which reason might a windows 7 password been reset to empty?

A user reports on monday he cannot access his windows 7 account anymore due to a "wrong password", which perfectly worked on friday. It turns out the password has been reset to empty for that account. ...
0
votes
1answer
52 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 ...
3
votes
4answers
12k views

A low tech yet secure way to keep track of passwords?

I use LastPass and love it. My girlfriend creates her own long, complex, unique, and thus difficult to remember passwords for every site. She frequently forgets them and has to rest the password. ...
0
votes
3answers
156 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
176 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?
2
votes
1answer
253 views

Storing a user's password in a retrievable manner

I currently store my users passwords as PBKDF2 hashes, for the authentication part of my web application. Each user also has their own private key and public key (also stored in their user profile in ...
0
votes
1answer
261 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 ...
4
votes
3answers
540 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 ...
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" ...
3
votes
3answers
547 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 ...
3
votes
3answers
629 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 ...
0
votes
3answers
292 views

Are windows users passwords easier to crack than linux?

If i set the same password in both linux and Windows, is it easier for a hacker to break the windows password? If so why and how can i create a windows password in the same security level as Linux?
7
votes
2answers
736 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 ...
-3
votes
2answers
662 views

How to secure a login.php file? [closed]

I have a hand built website, and am triying to build a cms/admin-panel, and my username and password, are not stored in a database, but, in a two setup file like seen below. index.php <?php ...
1
vote
1answer
133 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 ...
15
votes
6answers
5k views

My IP address (with a NAS) is targeted by a hacker. What to do? Should I be worried?

I've noticed, based on the logging of my NAS, that my IP address is targeted by a hacker. I already took action by automaticly ban the IP address permanently after five unsuccesful login attemps. ...
1
vote
1answer
77 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
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2answers
133 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 ...
2
votes
1answer
2k views

How to crack SHA512 hexdigest passwords with John the Ripper?

I've been playing with John The Ripper (JtR) to try to crack/audit a salted password that was hashed with SHA-512, with 20 interactions according to the source (for the curious, this is a Rails app, ...
1
vote
1answer
67 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
108 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 ...
2
votes
2answers
147 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 ...
30
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9answers
18k views

Feeding /dev/random entropy pool?

Which way of additionally feeding /dev/random entropy pool would you suggest for producing random passwords? Or, is there maybe a better way to locally create fully random passwords?
7
votes
3answers
8k views

Why is Chrome asking for the application-specific password and my account's password every time? [closed]

I enabled Google's two-factor authentication and found it ironic that Google Chrome Sync requires #1 You account password, and #2 an application-specific password. First of all, don't applications ...
-2
votes
1answer
61 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 ...
0
votes
1answer
3k views

How do I hash a password in C#? [duplicate]

I assume that the best way to handle passwords for a website is I create a hash of the password and save that hash in my database. Then when someone tries to login, I do a hash of the password they ...
2
votes
1answer
101 views

Global user override - Uncomfortable

We have recently started a project with a service provider who is a little old fashioned in their ways. They provide a product but don't market it particularly well, so we (as users of the product) ...
3
votes
2answers
110 views

entropy of two factor authentication

I have two independent authentication methods A and B with entropy a and b respectively. say compromise of A does not provide any information on B. Is entropy of two-factor authentication of A and B ...
14
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2answers
2k views

Linux password changed. Is this an attack or a hardware glitch?

My Linux (Ubuntu 12.04) password suddenly changed last night and I'm not sure if this is an attack or just a hardware/user error. This is on a personal/non-server box. Several strange events led up to ...
0
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3answers
8k views

What are the differences between dictionary attack and brute force attack?

Can someone explain the major differences between a Brute force attack and a Dictionary attack. Does the term rainbow table has any relation with these?
1
vote
1answer
82 views

Predicting the Entropy of the entire Password Database

Suppose that the passwords created under some specific composition rule "C" is to be tested for the security. One of the way could be to conduct survey on x number of people and measure the average ...
4
votes
2answers
262 views

Is there a strong reason to salt and hash passwords when password reuse is not an issue?

I am dealing with a system (in development) that uses randomly generated (not user provided), unique, strings to authenticate services that will consuming an API. Right now, these strings are stored ...
2
votes
1answer
179 views

Can windows passwords be recovered from the windows pagefile?

I was reading reasons for clearing page files on workstations with one reason listed is that passwords can be stored in the pagefile and therefore should be cleared upon reboot in the case of somebody ...
-3
votes
1answer
105 views

What is the algorithm of bcrypt? [closed]

In many places I heard that people recommend to use the bcrypt algorithm to save passwords into database while creating web applications.I want to know what is the algorithm used to bcrypt a password ...
3
votes
2answers
125 views

One time passwords using Mobile phones [closed]

It is safe to assume that the majority of users accessing the internet also possess the mobile phones. So can we take advantage of this and relieve users of remembering any passwords. Instead of ...
0
votes
4answers
224 views

Security of a Random Password

i. If I choose random password of length say 15 from the alphabet set of size 94 i.e. from the search space of 94^15, is my password protected against all kind of threats? ii. Will there be any need ...
0
votes
2answers
77 views

Identifying Memorable Composition Rules [closed]

A single word can be transformed in so many ways to create the password. With any word of length l there are l! different permutations. Appending digits and symbols to the word create alphanumeric ...
0
votes
1answer
90 views

which password was paired with my gmail address

Recently media have reported that a file of about 5 million gmail address and password pairs was published on a Russian Bitcoin forum. A media article on the leak Other media have reported that the ...
4
votes
4answers
1k views

Does Windows have a built-in password store?

What passwords are stored in Microsoft Windows? How can I know what password are saved in computer?