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

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2
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2answers
185 views

Combining SCRYPT + a short crc

I'm considering using SCRYPT for password storage. (I'm open to PBKDF2 as well, or bcrypt by itself). The issue is that I don't want this to become a potential point for a DDOS attack, given the ...
0
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2answers
305 views

Hashing request - What type of hash this?

I have a text which is hashed using several layers of hashing. The final hash looks like 2E55A1DD65AB839E62362DEF86D329D7. What type of hashing can it be? How can I find out what kind of hash sum I do ...
0
votes
0answers
20 views

Chrome/Youtube says incorrect certificate for host? [duplicate]

Why my Youtube always ask me: Incorrect certificate for host. The server presented a certificate that doesn't match built-in expectations. These expectations are included for certain, high-security ...
1
vote
3answers
84 views

How to compare passwords with duplicate password

On Steam, the gaming client, I have this habit of creating multiple "smurf" accounts. I have a randomly-generated, unique password, and I decided to use the same password for all of my multiple ...
0
votes
3answers
88 views

When to set security questions for a web application?

For enhanced security, we can use security questions and use them as a means for users to reset forgotten passwords or as an additional means for authenticating. When would we be the right time to ...
0
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2answers
56 views

How does RealVNC Enterprise Know My System Credential?

After the installation of RealVNC on a Windows computer, the default login username and password via VNC is the same as the system username and password. Can anyone tell me how RealVNC can access such ...
15
votes
3answers
3k views

Is it a bad idea to add random characters to user ID and password?

I've heard people say again and again that you shouldn't implement your own security algorithm, and I'd like to ask you if I'm breaking this rule. I'm creating a traditional client-server application ...
2
votes
3answers
163 views

is it feasible to improve the entropy of XKCD #936 by using a larger dictionary?

XKCD #936 uses a limited subset of the English language, only 2000 words. I just looked it up, and the English language has over a million words, a sizeable subset of those having special characters, ...
2
votes
1answer
128 views

Crackstation “Secure Salted Password” Java example - is it really secure?

I'm making an auth service so I've been looking for some good Java/Groovy implementations of password + salt hashing. I've found this article on crackstation along with a code example and decided to ...
1
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1answer
30 views

Can a PKCS12 file be distributed over insecure channel?

Is the PKCS12 only as secure as the password protecting private keys ? Can I distribute the p12 file over an insecure channel ?
12
votes
5answers
2k views

What is the best way to transmit password hash over unreliable TLS?

I have TLS connection between my server and client. I have no certificate, so the connection is susceptible to the Man-in-the-middle attack. I fear that attacker could intercept the password hash ...
28
votes
5answers
3k views

Are passwords comprised of key sequences on a keyboard any less secure than the same characters but jumbled up?

Here are two passwords: 5678%^&*tyuiTYUI and 8^tyU75%*IuY6T&i Both have the same number of characters and in each the characters are identical, the only difference is that the first ...
1
vote
2answers
109 views

Will hashing passwords in my use case improve security and why?

I am developing an application the architecture of which is arranged as follows: Session host <---> Central relay server <---> Session client All communication between the initiating ...
2
votes
1answer
114 views

Is it a good idea to expire passwords after a time relative to their security?

If a user has to change their password ever so often, is it a good thing to check it against zxcvbn or similar library and assign a expiration date relative to the risk of the hash being cracked?
2
votes
2answers
153 views

Storing lots of passwords that different levels of employees need access to

I am wondering what other people do for storing passwords. Our current model at my employer is fundamentally flawed in my opinion, so I am trying to see what other people do so I can select the best ...
25
votes
6answers
6k views

Are passwords that are manually typed in really unrecoverable from memory or disk?

As part of an increase in the security measures for our company, we're moving to making sure all password logins (databases, servers, etc), are done through a password prompt and never using stored ...
1
vote
3answers
124 views

How to transform an hash into a usable password?

I was reading about PwdHash and it inspired me to create a little project where you input a master password and an easy to remember alias into a password hash, like bcrypt, and then you get an hash. ...
0
votes
0answers
34 views

I forgot my ZIP file password. How do I bypass the encryption? Which software would work? [duplicate]

Should I use brute-force attacks? Do they even work? What options do I have? I only remember short fragments of the password and it's definitely more than 7 characters long.
0
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2answers
53 views

Is authenticating via the database secure

Sorry for this probably noobish question. So far, I've read password comparison/verification is implicitly understood to be made on the application layer and not in the database. For example in PHP, ...
0
votes
1answer
94 views

Can I get rid of storing user secrets by using OpenID, and what do I need to store?

What information do you have to keep about a user to be an OpenID consumer? I want to use OpenID to let users register and authenticate on my system. So while I'm at it I want to not duplicate ...
2
votes
3answers
1k views

Store password locally. Where? How to pass it securely?

I'm developing an application. The user must enter his credentials which will be sent to the server. If the user opens the application a second time he shouldn't need to enter them again - credentials ...
1
vote
1answer
27 views

How can I defend against Heroku (or any PAAS) ID theft?

How can I defend against Heroku (or any PAAS) ID theft? Is it correct to assume that if someone obtained my Heroku credentials that they would have access to any data in my app, regardless of any ...
2
votes
1answer
56 views

Is it sensible to use application password bypassing two factor authentication? [duplicate]

I discovered that some applications (like Sylpheed) seems unable to support two factor authentication. Google has a feature called application passwords - a separate password that "grants complete ...
1
vote
1answer
79 views

Storing server generated passwords

There are some applications that generate passwords for you. Consider a case where you sign in via Facebook, the application (let's call it NEWAPP) verifies your sign in on the server using FB tokens ...
6
votes
3answers
805 views

How to encrypt all existing customer passwords [closed]

I work for an online shop and since I worked here we have stored customer passwords in plaintext. I joined the company as a data inputter and when I discovered that we did this I flagged it up with ...
9
votes
5answers
3k views

Using Google Search results to determine password strength

Google is a repository of Internet data, as it indexes tremendous amount of data. It uses a prediction service to determine the rest of the search query. With such a huge repository in place, can we ...
2
votes
3answers
135 views

Storing random initial (one-time) passwords in plain text

I manage a vendor app that issues accounts (with passwords, of course) to end users. From what I can see, final user passwords are stored properly. My concern is the initial account generation and ...
0
votes
1answer
144 views

When bruteforcing a WiFi network password, Can that admin see it?

When bruteforcing a captured packet containing the encrypted password, can the owner/admin of the router see each auth attempt? I'm assuming you just encrypt each passphrase in the dictionary file and ...
0
votes
1answer
105 views

Brute force attacks detection risks

I would like to ask if using brute force attacks on some websites or online services can be risky in any way for the hacker? Let's say that someone is using medusa tool to crack password on his ...
3
votes
5answers
275 views

Are all unsalted password hashes inherently insecure?

Maybe I'm missing something obvious... Are all passwords stored in common, unsalted hash algorithms able to be attacked via rainbow tables?
0
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0answers
24 views

How rainbow table works? [duplicate]

I have roughly understand how a rainbow table works from http://en.wikipedia.org/wiki/Rainbow_table, but I am quite curious why there is a need of different reduction functions for each column for ...
1
vote
1answer
72 views

Are there best practices concerning application account credentials?

I am looking for best practices concerning application account credentials. For example, suppose I got a corporate application which uses an Active Directory application user account to communicate ...
4
votes
4answers
215 views

how to check for duplicate passwords

Is it possible to check if like 100 people are using the same pasword? without risking anyones password getting out? I heard google does this, not allowing the user to set a password 1000 people are ...
0
votes
1answer
94 views

How to use multiple charsets in hashcat

I wanted to use a brute force attack on hashcat but WPA/WPA2 networks are 8-64 characters long and they have multiple possibilities of a password. I was wondering if there was a way to use multiple ...
1
vote
1answer
47 views

How do you practically manage your never-use-personal-accounts-on-a-work-machine-ever double life, when your personal machine is a limited iOS device? [closed]

This is follow-up to Starting a new job after working at home for years. How to best protect data, secrets, and privacy in the workplace? The answer to that question is Follow company security ...
0
votes
1answer
89 views

Starting a new job after working at home for years. How to best protect data, secrets, and privacy in the workplace?

I have just started interviewing for new computer job after years of working from home. At home I feel very secure with how I protect myself from data loss and keeping my secrets secure. I backup ...
5
votes
0answers
176 views

Any problems with scrypt yet?

In the question Do any security experts recommend bcrypt for password storage? Thomas Pornin recommends the hashing function scrypt but saying it is "too new to be recommended on a general basis". ...
3
votes
2answers
330 views

Is fourteen characters long password really weak?

I've tried to sign in to Samsung Cyber Service Center1. Since I'm from Poland, at first I tried Polish version of that service. I have entered a password, that has: 6 numbers in total (in three ...
23
votes
4answers
3k views

What is the purpose of the “Password minimum age” setting?

What additional security can a "password minimum age" provide? For example: the user can change their password only after 24 hours have elapsed since the last password change.
1
vote
1answer
60 views

Storing salt and hashed password [duplicate]

Is there a benefit to storing salt appended to hashed password in a single column of a table verses storing salt and hashed password in different columns of the table. The OWASP guide here ...
-3
votes
2answers
48 views

Can I prevent brute forcing of hashed+salted user passwords without a dedicated validation server? [duplicate]

Salted hashes don't seem to offer any real protection for user passwords by itself. So long as a hacker has a quick way to check if a password is right or wrong, it's trivial to brute force it to view ...
4
votes
2answers
290 views

Password entry on OS X and keyloggers

There's several places in my ‘personal security infrastructure’ (is there a better phrase for that?) where I find myself typing very important passwords into text-fields on OS X (for instance, ...
11
votes
4answers
878 views

Does it indicate a bad password system to disallow certain characters in passwords?

When creating an account to the game League of Legends, the user's password must comply to a few rules. The one I'm concerned about is the "Must not contain slashes or spaces" one. The others are ...
11
votes
2answers
715 views

How can I find out the password hashing schemes used by the specific Unix accounts I log in to?

Every day I ssh in to 3 or 4 independent Unix accounts. I have been regarding them as more or less "equivalently secure" on the grounds that I'm using ssh, but after learning of how much variety ...
6
votes
1answer
273 views

Security of LastPass' password generator

I currently use LastPass for all of my password generation and management. After reading Diceware, I realized that LastPass' password generator might be insecure, as somebody could potentially ...
1
vote
2answers
87 views

What is the evaluation criteria that a site uses for a password as strong , moderate or less secure

I have been in kind of jinx as to how a website decides on which password is highly vulnerable , strong etc . Lately my yahoo account was told to change password which I am using for long time as the ...
0
votes
0answers
105 views

THC-Hydra dictionary attack on JSP login form

I am trying to use Hydra to attack a JSP form but I have some confusion. Normally we use command something like this hydra -L list_user -P list_password HOST-ADDRESS http-post-form ...
62
votes
8answers
7k views

Is forcing users to use a strong password effective?

I am designing a service that would, among other things, store sensitive information. To ensure no unauthorized access of this information, it would be encrypted with a key derived from their password ...
0
votes
1answer
97 views

Office password protection crack

would just like to have a check on the password protection/encryption of MS office 2007 and above. It is said that its not that easy to crack the password protection except by brute force, since 2007 ...
1
vote
0answers
31 views

THC-Hydra - one good pass = shows all valid [duplicate]

As in title. I'm testing my router security and I came up with problem. hydra 192.168.0.1 http-get-form "/:un=^USER^&pw=^PASS^:User Name or Password is incorrect." -L usernames -P passwords ...