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

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3answers
61 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
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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 ...
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1answer
647 views

How secure is automatic authentication in Skype?

How secure is checking the automatic authentication option in Skype client? What if I sign in with Microsoft account instead of Skype id? What if both accounts are merged? Is there any documentation ...
0
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1answer
25 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
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1answer
68 views

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

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 ...
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4answers
182 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, ...
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4answers
152 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
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7answers
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
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2answers
335 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
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2answers
241 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 ...
2
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2answers
86 views

Method to integrate Touch ID in iOS apps

With the recent announcement of Touch ID APIs for third party apps, I am wondering how can we leverage this feature to perform secure transaction ? I am looking for a method to use Touch ID in my ...
0
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1answer
40 views

THC Hydra 16 Valid Passwords?

So when i do hydra -l Admin -P "rockyou.txt" -s 80 192.168.13.1 http-get / it doesnt work for me, it says all 16 passwords are valid, but none of them works, can anyone help me with this? I tried ...
0
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2answers
103 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
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1answer
104 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
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4answers
66 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
131 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
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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 ...
271
votes
20answers
43k views

How does changing your password every 90 days increase security?

Where I work I'm forced to change my password every 90 days. This security measure has been in place in many organizations for as long as I can remember. Is there a specific security vulnerability ...
17
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4answers
842 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 ...
-1
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0answers
41 views

Implementing simple authencation based on random number generated [closed]

I have an application in which, i want make some admin options to be controlled by super Admin's permission. Currently , i have framed a simple flow/expectation how this is to be done. But, for this ...
-1
votes
3answers
73 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
68 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
19k 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 ...
4
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5answers
579 views

When hashing passwords, is it okay to store the algorithm used right there in the database?

Since hashing password has become a hot topic recently, it is only natural to expect things to change and assume that some time down the road you might want to replace/tweak the algorithm used in your ...
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3answers
153 views

Resetting passwords howto

I am currently in the process of designing a registration form for the users to register accounts. The accounts will contain a lot of personal information, so I want to ensure highest possible ...
0
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3answers
73 views

How important it is to change password regularly? [duplicate]

A WWW-site guided me to change the password regularly. Should I believe what the say, if my current password is long enough random string?
2
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1answer
121 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 ...
18
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4answers
6k views

Google Account: implications of using application-specific passwords

In the wake of the recent Mat Honan story I decided to try out two-factor authentication on my Google account. But in order to keep using it with Exchange, the Android OS, Google Talk and Google ...
0
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1answer
32 views

Can any App Store app access all of my passwords?

Whilst researching another question, I've noticed that on OS X 10.9.4 there are many instances of Library/Keychains/login.keychain from ~ within the Data folder of what looks like apps from Apple App ...
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2answers
74 views

Simplest way of hashing a password with multiple different hash algorithms [closed]

I have a list of plaintext passwords that I would like to hash with various different hash algorithms (for educational purposes). As a minimum I would like to obtain hashes under MD5, SHA1, SHA256, ...
1
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1answer
51 views

Should I NOT choose a password of max allowable character length?

Q: Suppose an attacker knows the max allowable character length, n, for a website's passwords. Would it be smart for them to attack passwords of length n BEFORE length n - k (where k is small portion ...
10
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2answers
4k views

Bypassing the BIOS password

Are there any reliable methods that allow an attacker to bypass a BIOS password, or alter BIOS settings without entering the password? A few ideas come to mind: The old battery trick (remove ...
5
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2answers
811 views

Appropriate response to 2014 Russian Security Breach (CyberVor)

The report from Hold Security says that 1.2 billion sets of credentials are in the possession of this party. I have a feeling that this report may be a hoax or a partial hoax due to grammatical errors ...
2
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3answers
188 views

Should I implement my own local password hash?

Having a more-than-elementary knowledge of internet security, I've realized that some web applications and websites I use implement a less-than-ideal password policy. Some examples include: ...
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5answers
146 views

Why after a website password reset am I asked to login again?

I have noticed that every web site has the exact same behavior for their password reset pages. They send a link to your email using which you can reach the password reset page. On that page you enter ...
542
votes
21answers
103k views

XKCD #936: Short complex password, or long dictionary passphrase?

How accurate is this XKCD comic from August 10, 2011? I've always been an advocate of long rather than complex passwords, but most security people (at least the ones that I've talked to) are ...
41
votes
38answers
7k views

What is your way to create good passwords that can actually be remembered?

What are the methodologies which can be used to generate "human" good quality password? They have to ensure a good strength and also easy to remember for a human being.
0
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2answers
90 views

Share passwords between developers [duplicate]

We have a project with 3 remote developers and myself, at the moment passwords (server logins, db passwords etc) are being shared via emails which are cc'ed to everyone, Is there a normal workflow ...
26
votes
6answers
4k views

Is Linux really that secure, with only root password denying external access?

While I was searching online for information about Linux security, the most typical explanation was: Linux is secure, because the root password is required to access the kernel and install new ...
7
votes
2answers
1k views

Is it bad practice to ask only for individual characters of a password? [duplicate]

Some financial websites that I use use passwords in a peculiar way. Instead of asking me the whole password string, they only ask me to enter e.g. "3rd, 5th and 8th character of your password", i.e. a ...
3
votes
2answers
1k 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 ...
0
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2answers
82 views

How to combine a key and a password in practice

Alice wants to encrypt her data. She is not comfortable with using only a password. While she prefers to use a properly random crypto key, she isn't confident she can protect the key file from theft ...
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0answers
24 views

Syncing service passwords during offline installations

Due to very paranoid customer requirements, we have to install several Windows services on two different systems that should run under a shared service account. Each system should each have a copy of ...
1
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1answer
53 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 ...
0
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1answer
59 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 ...
0
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3answers
91 views

User Account Guessing [duplicate]

I'm doing some research on user account guessing, and wanted to ask a question about some "bad practices". My thought is generally this is a trade-off between great user functionality/UX and ...
24
votes
4answers
3k views

How secure are my passwords in the hands of Firefox using a Master Password?

I'm relying on Firefox to remember my passwords, using a Master Password of more than 25 characters. How secure is this set-up?
-1
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1answer
108 views

Cracking a 6-character alphanumeric password Windows dialog box

To put this problem in context, I have a touch monitor screen whose firmware program is protected by a password. The firmware program is downloaded over RS232 via a Windows utility program provided ...
1
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1answer
820 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, ...
178
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18answers
11k views

Passwords Being Sent in Clear Text Due to Users' Mistake in Typing it in the Username Field

Upon reviewing the Logs generated by different SIEMs (Splunk, HP Logger Trial and the AlienVault platform’s SIEM) I noticed that for some reason quite a few users tend to make the mistake of typing ...