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

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0
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1answer
323 views

Password protection of encryption and signature keys

I would like to store encrypted backup of text files on my computer. I'm developing a python script using Pycrypto to achieve that, based on this code to use the library. (current code) The basic ...
2
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5answers
455 views

Is there value in storing passwords in their own table with encrypted or hashed keys?

The usual method for simple sites is to store a hash of a user's password right in their user record. What if the password field is removed from the user table, and a password table is created? The ...
4
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2answers
261 views

Is there a site like plaintextoffenders.com that shames companies that force insecure passwords?

I recently came across http://plaintextoffenders.com/ and I liked the idea. I wondered if there was a similar site that shames websites that force insecure passwords? I personally have a list of a ...
4
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2answers
665 views

How secure are passwords that are set via IRC's /nicksrv?

I just registered a nickname on IRC and had to use a password to register it. Given that I've only used IRC, but never understood the P2P mechanics of it, I'd like to know: Is the password I ...
22
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7answers
8k views

Why don't people hash and salt usernames before storing them

Everyone knows that if they have a system that requires a password to log in, they should be storing a hashed & salted copy of the required password, rather than the password in plaintext. What I ...
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5answers
2k views

Gold Standard for password hashing

I've developing a web application that will be dealing with highly sensitive information and I want to ensure the hashing of passwords is gold standard. Ideally I'd go for per-user salted SHA512 ...
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3answers
2k views

What should I do if I type my password in the address bar, or type password in google search?

When someone accidentally types his or her password in one of the following three locations and presses enter, what should they do? username text box address bar Google search What do you suggest, ...
8
votes
7answers
923 views

How can I prevent users from using bad passwords in my web application?

There is a long discussion on whether it's the responsibility of the user or the system administrator to deal with the strength of the password. Obviously, the password is a very private thing, but ...
3
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3answers
222 views

What security factors should I take into consideration when selecting a bank?

I've gotten fed up with my bank and have made the decision to move all of my banking elsewhere. This is a rare occurrence for me and, I suspect, for other people as well. It represents an opportunity ...
13
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3answers
15k views

Choosing a session ID algorithm for a client-server relationship

I am developing an application which has a client-server relationship, and I am having trouble deciding on the algorithm by which the session identifier is determined. My goal is to restrict ...
3
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1answer
653 views

Updated list of bad/overused passwords [closed]

I am building a website, and I'd like to make sure the users don't put an overused password like password or password1.. or any of these Is there a place that constantly analyzes hacked websites ...
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2answers
134 views

Can 2FA help handle mixed personal and business accounts after leaving a company?

I do not want a super administrator in Google Apps to log to my account after leaving company, so I enabled 2-step verification. He could login to many sites as me with just a link in "forget ...
2
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1answer
269 views

How to safely “remember” login information in a program [duplicate]

Possible Duplicate: How to Securely Implement a “Remember Me” Feature? I have a program that communicates with a server. The user must log in with the application which runs on their ...
2
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5answers
631 views

Does shuffling a hashed password increase its security?

I am making a web app and I'm now stuck on making the login secure. I'm thinking of adding a salt to a user-inputted password and then hash it. (md5 or sha for example) and then I will reshuffle the ...
1
vote
2answers
234 views

Is there guidance that says all sessions to be logged off when a user changes their password?

Often when an account is hacked, security guidance is to change your password. However I've noticed that changing a password sometimes isn't enough to log out of other sessions that are active. Is ...
71
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13answers
6k views

VP of IT claims he unhashed 100% of all 16k employees' PWs. Is he lying to us?

I work for a company which has ~16,000 employees. Periodically, our VP of IT sends out a newsletter with "tech-tips" and misc IT stuff. The topic of this week's newsletter was "password security". ...
5
votes
5answers
2k views

Increased security with keepass

I am using keepass for securing passwords. I have a reasonable password, but if someone got hold of the file I am sure eventually they could brute force it. I was thinking of using a key file as ...
2
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1answer
2k views

Clarification on how rainbow tables work

If you goto : http://www.hanewin.net/encrypt/aes/aes-test.htm for "Key in Hex" enter 00000000000000000000000000000056 for "Plaintext in Hex" enter 00000000000000000000000000000000 and click on ...
28
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5answers
3k views

How valuable is secrecy of an algorithm?

On the surface, the inadvisability of security through obscurity is directly at odds with the concept of shared secrets (i.e. "passwords"). Which is to say: if secrecy around passwords is valuable, ...
6
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4answers
3k views

iOS app - hash user password in-app or on-server?

I'm working on an iOS app that will also have a web component. When a user creates an account, their password will be salted and hashed. I already have the hashing algorithm working on the web-side. ...
4
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6answers
3k views

Is there a table that compares hashing algorithms by speed, relatively (machine independent)

As far as I understood*, one of the major criteria when choosing a password / salt hashing algorithm is it's speed. To prevent brute force attacks, a slower algorithm is better (and also makes it more ...
18
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6answers
3k views

Why do we ask for a user's existing password when changing their password?

In a web applications context, when a user wants to change their current password, generally they would have to enter their current password first. However at this point, the user has already been ...
18
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7answers
6k views

Are password reset links that don't expire a security risk?

I am currently working on a password reset flow. We have decided to go with a password reset link being emailed to the user's registered email and allowing them to follow that and input a new ...
3
votes
2answers
657 views

How should you store a password that needs to be retrieved as plaintext? [duplicate]

Possible Duplicate: How should passwords be stored if they must be recoverable? I have created an API for a site that doesn't provide any form of API. For the API to do anything with the ...
2
votes
1answer
106 views

What's the best way to enumerate log/sign in attempts?

For sign in via a website, what is the best way to count the number of attempts that is: least vulnerable to tampering reliable quick The system would: use HTTPS throughout the sign on phase (at ...
2
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3answers
958 views

Key stretching a hash

If I implement a function which hashes the first half of my password with MD5 and the second half with SHA-2 and MD5, is there a security issue when I put these two hashes together to create a 64 ...
20
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9answers
1k views

Is a simple, but very long password a good password?

Is a password like wwwwwwwwwwwwwwwwwwwwwwwww9 (25x 'w' and a number) secure? It would be easy to remember.
31
votes
11answers
3k views

Is it safe to use a weak password as long as I have two-factor authentication?

I'm careful to use strong passwords (according to How Big is Your Haystack, my passwords would take a massive cracking array 1.5 million centuries to crack), I don't reuse passwords across sites, and ...
3
votes
1answer
203 views

SRP: Can the client authenticate using only the stored hash?

Based on the description of SRP, it seems that it would be possible for a client application to cache the hashed password x and reuse it for subsequent authentifications. The actual password p doesn't ...
5
votes
3answers
265 views

Does a 'reset password' website facility give away too much information?

If a website has a reset password facility (which will e-mail the account holder a reset link), does this facility reveal too much information by allowing someone to probe who holds an account by ...
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vote
2answers
692 views

Is dual control password is a feasible way to secure against unauthorized login?

I see that some organizations practice dual control password especially when it comes to critical system logins, etc. Is it feasible to implement such policy considering certain trade off such as ...
2
votes
3answers
324 views

Passwords In Securing Network Devices

I don't do anything with corporate IT and networking, but I know enough to handle and get networks going. Anyway, something I ran into in my travels when it comes to the occasions of working on ...
55
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12answers
3k views

How do you log in from an unsecured computer?

Suppose that you are on a cybercafe, at a friend's home or at your work office, and you need to log in on a site, but you feel that the the computer can not be trusted (e.g. your friend isn't ...
3
votes
1answer
362 views

Is there a better way to take advantage of current 'approved', 'proven', and memory/cpu-expensive algorithms while using salts and peppers?

I've read about the concepts presented in these two questions: Pre-hash password before applying bcrypt to avoid restricting password length Would it make sense to use Bcrypt and PBKDF2 together? I ...
4
votes
1answer
118 views

Is there such thing as a smart phone with auto-forget password feature?

Storing passwords to external services (e.g. corporate email servers) on smart phones is very insecure, since phones are more easily stolen. Has any vendor implemented a feature to only cache a ...
7
votes
2answers
4k views

Practices for storing username/password in Web applications

I have read the following question: Storing password in Java application but I don't find the answers useful for my case. So here is my question somehow related to that. I have a Java Web application ...
0
votes
1answer
113 views

Credentials using AWS IAM

I have a server, which should provide temporary credentials to the client. The credentials will be transmitted using HTTPS. The client should be able to upload S3 files, as well as download them. The ...
3
votes
3answers
203 views

What are some ways to steal a password/PIN using this system?

http://cups.cs.cmu.edu/soups/2007/posters/p147_lim.pdf Essentially uses an on-screen keypad that does not show the complete keypad numbers at a time. The image is refreshed at the rate of the ...
19
votes
4answers
975 views

Should I be concerned when a “Forgot Password?” tool sends my password in plaintext?

Some sites I have been a member of in the past don't go through the normal "Forgot Password?" process. Instead of e-mailing me a unique password reset link or something of the like, I have received ...
5
votes
3answers
670 views

Unmasking passwords during sign up, is it a good idea?

I just read this article about unmasking passwords at sign up for usability reasons. On the surface it seems reasonable to me, but I'm wondering what additional security concerns that might generate, ...
6
votes
3answers
660 views

Is piping a `ssh-agent` signed message as a password secure?

There's an encrypted filesystem on a server I ssh into using public key authentication. Since a forwarded ssh-agent can deterministically sign a message (see also the ssh-agent protocol section ...
1
vote
2answers
795 views

Password entropy match for alphanumeric but there are special characters in password

I have a problem cracking some of the fundamentals on passwords' entropies. Namely: I have read this article about a guy cracking DKIM of Google (maybe more noticing that the keys are only 512 bits) ...
8
votes
3answers
6k views

I don't see how “-salt” in the openssl command line tool enhances security at all

I do this to encrypt a single file: openssl aes-256-cbc -a -salt -in file.txt -out file.enc and then type in some regular plaintext password. I do not understand how -salt enhances the security of ...
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votes
2answers
444 views

How do I construct a rainbow table to crack a 6 character password? [closed]

Given the hash: 491c290affbf5436f0fc0584ccefb2 how do I construct a rainbow table to crack this password?
28
votes
3answers
4k views

MD5 collision attacks: are they relevant in password hashing?

DISCLAIMER: This is not an endorsement of MD5 as a password hashing function. I know about parallelization, GPUs, and dedicated password hashing functions like bcrypt and scrypt. With that out of ...
5
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3answers
331 views

Decoy User Account on Windows

Is there a way to have two passwords for a Windows account? One password unlocks the decoy version of the account and the other unlocks the "real" version of the account. I would use Truecrypt's ...
18
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4answers
2k views

My credit union is reducing its maximum password length to 10 characters

I just received an email from my credit union saying they are redesigning their online banking service and that I will need to change my password by October 22 to conform to the new limit of 10 ...
6
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3answers
329 views

How much added security do I really get with a longer key size?

Imagine I have a cipher which supports keys of 128, 192 or 256 bits. Suppose that there are no vulnerabilities in the cipher regardless of key length. I'm going to use it to encrypt something, and ...
2
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1answer
1k views

Password authentication using DynamoDB

I'm working on a Mac app. I have users stored using DynamoDB. Authentication is needed to enforce access control on system-internal operations, such as uploading files to Amazon S3. Of course, I ...
10
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2answers
841 views

How insecure is PowerShell Web Access?

Windows Server 2012 comes with a new feature that allows you to administrate the server via a PowerShell command line in any modern browser including Smartphones. This sounds cool and scary at the ...