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

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0
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1answer
94 views

Requiring a pin instead of password for websites?

Curious if this could be a good alternative to passwords. On a website, user can choose to use a pin instead of password. If she does elect to do this (given option) from then on, her account asks for ...
7
votes
6answers
967 views

Storing password hashes without a correlation to the user account

I read an interesting article about an alternative way to store password hashes ans was rather intrigued. A better way to store password hashes? The primary concept is having a large table full of ...
4
votes
3answers
492 views

How can I find if my password has been posted online?

I have just received this email from AbeBooks.com: Hello AbeBooks Customer, This is an important message from AbeBooks.com. As part of our routine security monitoring, we have learned ...
15
votes
1answer
4k views

Can a dictionary attack crack a Diceware passphrase?

Everyone knows the words used in Diceware passwords (all 6^5 = 7776 words are published) -- they're all common words. Everyone seems to know that we're not supposed to use dictionary words for ...
0
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0answers
36 views

drupal external authentication - how to handle password?

I need to implement an architecture someone else designed. They have a drupal as user interacting component, and an external authentication module. To authenticate, from drupal, username and ...
2
votes
1answer
193 views

What are the typical ways to generate a One Time Password?

I'm looking for the typical ways to generate a One Time Password. I know about the HOTP and TOPT. But, in my case, the problem is that the "server" only has a display as interface and the ...
4
votes
2answers
200 views

XKCD-like passphrases to stdout

I'm trying to find a way to crack XKCD-like passphrases (correcthorsebatterystaple) from word dictionaries. Basically concatenate X number of words from a dictionary file. Right now it honestly ...
8
votes
4answers
2k views

Hacking computers, scifi or reality

I was watching The Girl with the Dragon Tattoo, and this female hacker was really good at hacking. My question is, how is it possible for her to crack passwords besides the brute force approach? I ...
1
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2answers
108 views

Is it possible to find CryptoKey from orginal password and hashed password?

WebsitePanel is a windows hosting control panel that uses a CryptoKey to hash passwords into the databases. We have lost WebsitePanel config file and lost CryptoKey. We have to reinstall WebsitePanel ...
4
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2answers
195 views

Two-factor verification without a mobile phone?

Currently, some services use a second layer of veficiation if logging in from a new device: Gmail and Facebook send a text or call with a code Facebook generates a code in the mobile application ...
13
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2answers
614 views

How Does A Random Salt Work? [duplicate]

I don't understand how using a random salt for hashing passwords can work. Perhaps random salt refers to something other than hashing passwords? Here is my thought process: The salt is used to add ...
-2
votes
1answer
75 views

Salt and password [closed]

Reading the doc for setting the password, the command is : python -c "import crypt; print crypt.crypt('password', '\$6\$SALTsalt')" SALTsalt is the 8-character crpytographic salt. Valid characters in ...
2
votes
1answer
344 views

Is there a way to identify the location of a person trying to intrude your wifi network? my wifi router is picking up his attempts

Aug 30 20:28:09 dropbear[6799]: Child connection from ::ffff:5.10.69.82:38463 Aug 30 20:28:11 dropbear[6799]: login attempt for nonexistent user from ::ffff:5.10.69.82:38463 Aug 30 20:28:12 ...
1
vote
2answers
232 views

How do I generate a word list from a known seed word? [duplicate]

I've lost my master password. Not all is lost as I know the original word that generated the password: It was generated by a random case switching for consonants and random vocal to numbers. For ...
7
votes
3answers
523 views

Password list generation

I've found during a lot of recent pen-tests that companies will use passwords like c0mp4ny@b( for a company called "company abc" Is there any quick and easy way to generate a list of passwords ...
-2
votes
1answer
88 views

client side and server side hash password [duplicate]

Another question about client or server side password hashing, I know. After reading many other post about this topic I'm still a little confused and not completely sure what is the best, because I ...
-3
votes
2answers
150 views

Time it takes to crack a password on site like yahoo [closed]

I have a question. If you were using a password brute force/dictionary attack utility on a site like yahoo or another site, how long would it take to crack a password like Jah13Wootiang if Wootiang is ...
23
votes
3answers
3k views

For an HTTPS web application, is it worthwhile to encrypt the password before POSTing it, to keep a MITM attacker from harversting it?

Our application has recently gone through penetration testing. The test found one critical security breach, which is essentially: The problem: Attacker sets up a WiFi spot. User enters our site ...
2
votes
1answer
132 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 ...
5
votes
3answers
200 views

How secure is this method to remember security questions?

So I found an interesting method of remembering those pesky security questions. Basically, the guy takes a hash of the question (IE what is your mother's maiden name?) and then appends his own ...
1
vote
1answer
89 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 ...
-3
votes
1answer
37 views

Which encryption technique should be used for users name and passwords in my notebook [duplicate]

i writing all my passwords and users names on my notebook emails,amazons,facebook. and i have really Nosy little's brothers that will probably look at my notebook when i am not around, which ...
29
votes
4answers
3k views

What is the point in having arbitrary username requirements?

I've looked around on Security.SE, but couldn't find much related to the following problem: I recently signed up for Chase Quick Pay as my method of being paid by a part-time job. I've heard of ...
3
votes
7answers
204 views

Is providing a website password over the phone any less secure than other identifying information?

I've been dealing with two separate banks for completing a 401k rollover (I do not have any other accounts with either of the two banks), and I've encountered something with both that I've never seen ...
-4
votes
7answers
859 views

Are passwords made up from concatenating a few foreign words better than shorter random characters? [duplicate]

Does it make sense to insert a foreign word into a paraphrase to mitigate against brute force? For example: "pussiMeansCatInEskimo" "caballoMeansHorse" "CatIsGatto" "SalopeMeansBitch" ...
2
votes
3answers
204 views

What risks am I taking with a weak password on a laptop?

I'm setting up a Mac laptop for my wife. Mine has a ridiculously strong password, but she finds this annoying. If I give her a (relatively) weak password for convenience, what risks am I taking? A ...
25
votes
6answers
2k views

Are there secure alternatives to single-use password reset links?

We currently have what I believe to be a pretty standard scheme for dealing with password resets. Our reset links are single-use links: They expire immediately after they've been visited, even if the ...
3
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2answers
202 views

Are weak passwords acceptable for internal development?

We have a number of internal development environments that use weak passwords in the Auth and SQL components; particularly using passwords such as "password" or "Password1". These are obviously ...
3
votes
2answers
246 views

Can the human brain generate cryptographically secure random numbers?

A security conscious friend of mine was attempting to generate entropy using random dice rolls to generate a random password, and I became curious about the security of random number generators and ...
1
vote
2answers
500 views

Brute force alphanumeric password using JohnTheRipper

I recently recovered a zip archive with some files I need access to, but I can't remember the password. All I can remember is that the password was short (around 3-4 characters), and contained only ...
1
vote
4answers
279 views

Should BCRYPT be used for client-side password hashing

I am concerned about the use of bcrypt for client-side password generation. I am developing a password generation function to be used client-side, similar to PwdHash and PasswordMaker. Much has been ...
-2
votes
2answers
91 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 ...
0
votes
3answers
152 views

How secure are sentence passwords? [duplicate]

Lately I've been doing the trend of using passwords that are sentences, at least on sites that have a reasonable maximum character length and allow spaces. So for example the most basic variation is ...
7
votes
11answers
2k views

How to easily remember lots of different passwords?

I know that you shouldn’t use the same password on every site. But, when you log into several dozen sites, keeping track of all the passwords can be pretty hard. What system do you recommend that ...
0
votes
1answer
90 views

What multiplier to use when calculating the average time to crack passwords with a given entropy?

Suppose that we have a process that generates passwords with entropy E. I'd like to compute the average time it would take for a brute-force attack to crack an MD5-hashed instance of such a password. ...
-5
votes
1answer
1k views

How to decrypt the encrypted data, in SHA256, of mysql database? [closed]

I have some data in column of table of mysql database in the encrypted form applied with SHA-256. How to decrypt that data using Java. I stuck at this since 4 days. Please spend 5 minutes of your ...
1
vote
4answers
228 views

Protecting Password in Code

I am writing a program in Processing (which is basically java), that (amongst other things) downloads files from a FTP Server. To connect to the Server the program needs the correct FTP-password, ...
1
vote
4answers
181 views

Authentication with an untrusted server

I asked a related question earlier, but I want to ask a broader version this time: To simplify things let's say I've developed an application that allows users to send messages in a chat room, and to ...
7
votes
6answers
2k views

Is denying login after incorrect attempts ineffective?

Generally denying login attempts after X amounts of incorrect attempts for Y amount of tries is a very basic way to prevent bruteforce attempts or malicious login attempts. Yet, surely doing this is ...
0
votes
2answers
365 views

Recover password or password hash from locked account

I have a locked administrator account. Other accounts are unlocked, but they have no rights. I want to get a password from the locked account, or maybe password hash, if possible.
2
votes
2answers
276 views

What are my options for securely printing an OTP Scratchcard?

I want to print and distribute several One Time Passwords (OTPs) that can't be easily disclosed to a 3rd party in transit. (think the physical version of a TLS session for private secrets) To me ...
0
votes
2answers
113 views

Where are passwords hashed? [duplicate]

The way I understand password security is that the user enters a password, which is then converted using a hash function. The website then compares it to the stored hash to see if it is correct. That ...
0
votes
1answer
107 views

Why doesn't the OS give every application a secret password?

As far as I understand if Dropbox wants to automatically run in the background without asking the user for a password it has to store the password somewhere on the harddrive and has currently no way ...
0
votes
4answers
113 views

How long does a passphrase have to be to be as secure as a random collection of letters, digits, punctuation, etc.?

If one uses a passphrase which is grammatical, such as "I put my keys under the doormat because they're safe there."... how many words (on average) must it contain to be as secure as a password with ~ ...
0
votes
1answer
146 views

Are all OSes vulnerable to local password reset attacks

It's not that difficult to reset the password of the administrator account in MSWindows when you have local physical access to the machine Same thing applies on any Linux distro, it's possible to ...
19
votes
4answers
3k views

The registration confirmation email contains my password: do they keep it in plaintext?

I was kind of shocked when I just received my confirmation mail from the shop where I just registered myself: they sent my username (which is my email address) and the password I typed in. The ...
17
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4answers
958 views

Is it a bad idea for an information holder to e-mail a user their password?

A couple of websites with which I'm registered have, after a period of inactivity on my part, each sent me an e-mail to remind me that I'm still registered. In each case, that e-mail has included my ...
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votes
3answers
79 views

What does one call the strategy of using “pre-password transforms” as passwords?

Suppose that instead of using, say, Google, let me in! as my Google password, I used some consistent transform of this string, say ZWE1NjMyNm? What search keywords would be helpful to search for ...
0
votes
2answers
83 views

Do dictionary attacks only use specific entries from a dictionary, or combinations of an entry?

If I wanted to crack a password, "cba", but the dictionary I was using only had abc in it, does a dictionary attack try all combinations of abc? abc, acb, bca, bac, cba, cab Or would cba have to be ...
6
votes
5answers
21k views

Modern high quality password dictionary

Has anyone come across any good password dictionary lately? Some of the lists I found dated back to 90's! Some are simply too big that I doubt their quality. There appears to be some work by someone ...