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

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283 views

Security implications of setting the same password on private key and PKCS12/JKS?

Are there any negative security implications of setting the private key password (DSA in this case) as a PKCS12 (and then JKS) export password (instead of generating/inventing a new one)? My use case ...
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1answer
102 views

storing username/email and password with a hash of the hash of the email/password? [duplicate]

Quite the simple discussion this one (one would assume): If I'd hash the email and password, and then hash the hashes, whould this be considered safe enough or would this just be a waste considering ...
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2answers
398 views

Encryption method and other security concerns for a simple password manager [closed]

I thought I would learn a little bit of cryptography programming by making myself a simple password manager program that I can potentially even use to keep track of my passwords. The idea is that my ...
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3answers
283 views

S/MIME doesn't protect against a stolen password, right?

We're setting up S/MIME so that we can send encrypted emails. However, I have a bit of a stupid (and maybe obvious) question... If someone steals a password for either the sender or the receiver, ...
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1answer
4k views

Brute force password cracking with a GPU

How are GPU's provisioned for password cracking? Do all, if not most cracking programs have special GPU aware software or do they just function at the basic driver or API level of the device? Can it ...
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1answer
1k views

Which is a safe way to record Firefox passwords in Gnome Seahorse Keyring?

Here is a question that I asked on "AskUbuntu" and I've been suggested to ask it here: Searching for answers about ways to record Firefox passwords in Gnome Seahorse Keyring vault, I found severals ...
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6answers
621 views

How to keep website passwords safe among employees? [duplicate]

We're a website developer agency, and most of our websites are made using in Wordpress, Joomla or Drupal as a CMS. I'm having trouble to decide how we should manage our passwords, and I'm open for ...
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2answers
125 views

What is more secure: single long hash, or combination of two shorter?

Fictitious scenario: User accesses a restricted data (available online) identified by random string (supported by captcha to make brute-forcing more difficult). So data is not protected by a user/...
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1answer
2k views

How do I generate a blowfish password hash in Ubuntu?

What's the command line to generate a blowfish password hash? I can't seem to figure this out at all. Apache's htpasswd only supports bcrypt, and openssl passwd doesn't even do blowfish hahes (but it ...
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1answer
187 views

Simple and secure remote installation method that accepts input via a web page?

When installing software on a remote server: Is it possible to let the admin (i.e. the user that installs the software) define admin username and password via a HTML page, in a secure manner? ...
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3answers
2k views

Preventing dictionary attacks against hashed passwords [duplicate]

Possible Duplicate: How to securely hash passwords? I have a website and on that website I use SHA-256 and salt my user's passwords. What I'm doing right now is padding each letter of the ...
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4answers
736 views

Security implications of using a OAuth-enabled password manager

I've resisted the idea of password managers for a long time. Bringing together passwords for all your online accounts in one place that is only protected by difficult-to-remember master password doesn'...
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1answer
627 views

Securely tell the user his password in new WHM/Cpanel account creation?

I understand it's not safe to send passwords via email but when accounts are created via WHM/Cpanel, I have to let the user know what password I created for them. How can I relay the password safely?
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3answers
577 views

Linux mcrypt security

I just installed 'mcrypt'. When I try to encrypt some file with DES using the command 'mcrypt -a des myfile', I am prompted for a passphrase with a maximum character count of 512. > mcrypt -a des ...
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4answers
67 views

When (if ever) should web app force numerical, generated (hence hard to remember) logins?

Some bank sites force me to use system generated numerical login (ie. 8 digit number). Apart from singnificantly decreasing usability and giving impression of security (to some), does it serve any ...
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1answer
260 views

Can accounts still be logged onto if Password Caching is not enabled?

This is kind of an extension of my other question.. If you were not storing any of the passwords locally (caching disabled), would a user some how still be able to circumvent around this security ...
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1answer
123 views

What function(s) to be used to generate Salt on Windows Mobile 6

I am looking for THE or a real function I can use to generate salt for my mobile app on Windows Mobile. In case I am not abusing in this request but in the future I plan as well the same app for ...
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2answers
450 views

Received an email about an “Etsy” Password Reset due to the “Linkedin Breach…” is this a phishing attempt?

I received an email today from Etsy saying they are resetting my password(from the source it looks like a mass reset of all users), due to there being some sort of Linkedin breach, that compromised ...
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1answer
84 views

What are good password storage policies? [duplicate]

The world has progressed to the point where most of us have faulty memories and dozens of passwords to remember. What are good ways to solve this problem? I am interested in multiple answers and ...
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1answer
30 views

Passing a hash of a secret to a server instead of the plain text

Instead of passing an authentication token or api key in an http header to a server in the plain text, what if I calculated its hash and passed the hash? This way even if a adversary intercepts the ...
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1answer
52 views

What are the advantages of a ZKP authentication system?

So, I read somewhere that Zero Knowledge Proof based authentication is good because it makes sure that the server does not store your password and neither is your password being transmitted over the '...
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1answer
96 views

How much more difficult does it become to crack a password when appending a 5-digit pin?

I have a quick question regarding password cracking. Lets say you append a 5 digit pin on the end of your password. An example would be instead of a password of "password" it would be "password12345"....
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1answer
79 views

What password based key derivation does PKCS #12 use?

I would like to make a note that I have read all of rfc 7292. I am trying to decrypt encrypted private key in a pkcs#12 pfx file. The private key is enveloped within pkcs#8 shrouded key bag. The ...
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1answer
71 views

Storing credentials for desktop app

I have desktop application written in C# with three user roles and some predefined users. It is also possible to create another users or change passwords to predefined users. App has to work offline ...
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1answer
128 views

Copy-and-pasting plaintext data from encrypted container

Suppose we have sensitive information stored in plaintext within a dm-crypt/VeraCrypt encrypted file and this information is copy-and-pasted by a user into a web browser after decrypting (this could ...
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1answer
45 views

Is there a PAKE algorithm where the passwords can be tested in the first round?

I want to use PAKE for key exchange between two parties (Alice and Bob) which share a low entropy secret (a password they exchanged on a piece of papers). Alice and Bob use a software on there ...
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2answers
34 views

Rembering password on client (not database) [closed]

I am trying to implement the capability for my program (C++) to remember a user/password combination, so the user does not need to type it in again. Is there a secure way for my program to store this?...
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2answers
209 views

Is Linux getting less or more secure? [closed]

The famous so-called virus-and-hacker-free Mac is a thing of the past: As it gets more popular it gets more vulnerabilities. Will Linux be the same at some point in time? Is it getting less of more ...
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1answer
321 views

Hiding database passwords for classic ASP connection strings

Looking at some old classic ASP sites which could do with a bit of tightening up. The SQL server database connection string has the password in clear text within an include file on the server. ...
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1answer
154 views

WordPress is asking for my FTP password to update. Is this official behavior or am I compromised?

I'm running a personal WordPress server and I have 3 pending updates: WP update from 4.2.2 to 4.3.1. Akismet plugin update to 3.1.5 which addresses XSS issues. Twenty-fifteen theme update. For ...
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2answers
177 views

Questions about user authentication over REST API

I'm now trying to implement user authentication on my android app. I, however, have a few questions. I use a REST API. How do I safely request and send data to and from the phone? I'm assuming that I ...
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1answer
112 views

HMAC password reset link and replay attacks

I like the look of this technique for sending password reset links: https://neosmart.net/blog/2015/using-hmac-signatures-to-avoid-database-writes/ (TLDR: don't store token in database. Send password ...
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1answer
55 views

What is a viable time-frame for links that expire? [closed]

Links that expire can be found anywhere from Email Verification to Password Reset procedures, I understand in most cases this is considered "security theater", but wanted to know what a viable time-...
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2answers
1k views

Do cloud-based password managers invalidate even the most secure architecture?

Can an online password vault, like Lastpass, be defended through a security assessment that demonstrates the value they provide outweigh the risks of being a high value target? A valid answer would: ...
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2answers
128 views

Double hashing using a relatively new hash and a old, tested one

Note: I am relatively new to cryptography in general, so please point out if I make any misconception here. I heard that you should always use well known crypto/hash functions, that have already been ...
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2answers
1k views

John the Ripper exclude incremental mode from another incremental mode

I want to crack an 8 characters password. First, I tried the incremental mode digits, but I did not find the password. So now I know it's not all digits password. I want to use lowernum incremental ...
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1answer
58 views

Should I show the security answer when the user goes back to edit the field?

So when a user signs up to create an account, they are required to select select questions and enter security answers. Once they do that, they can proceed forward to a review page that shows them the ...
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2answers
148 views

I forgot my 7z password [closed]

I used 7zip to encrypt a 200mb archive of my code used a combination of some of 7 possible words and no numbers or caps. So 823543 possible passwords. What is the best free program I can use to ...
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2answers
185 views

Hashed master password and generated encryption key in a password manager program

I'm writing a WPF password manager application to practice programming, so far this is the scheme I intend to use to store master password and individual site password: Master password: Generate a ...
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1answer
262 views

Windows passwords: Blank/non-blank, admin/non-admin

What are the security concerns of the following user account setups on a normal Windows 7/8/10 desktop machine compared to: Using a non-privileged account with a password and having an admin account ...
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1answer
763 views

Has anyone used this ICLOAK USB device? [closed]

Does anyone know about this ICLOAK USB device? Opinions or how well they work? I'm looking for a security solution when I'm using PCs where I work. Occasionally we have to log into to web sites, ...
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1answer
420 views

How is password information stored and used on Android accounts?

How difficult would it be for someone who stole your device to gain access to the username and password information stored under the Settings -> More -> Accounts section of an Android device? ...
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1answer
107 views

Password sharing with spouse or mate (bulk-change shared passwords (via cloud service))? [closed]

I've read on New Scientist magazine that in 80% of all cases when people in a relationship share a place where they live one of the spouses knows the other's password, thus making the question I am ...
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2answers
204 views

Different password for each login - based on some variable

This might sound a silly question, but I was thinking this as and extra option(which is not required) mainly for advanced users, who want to protect their accounts even more. Lets consider that other ...
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1answer
87 views

Why should I include a client_id in an OAUTHv2 password grant request?

Like little red riding hood, you don't know who is knocking on the door... Why even bother accepting a client_id in case of a API <-> Javascript-website or API <-> Android App password grant ...
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1answer
98 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 ?
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1answer
68 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 ...
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1answer
107 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 https://www....
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1answer
547 views

What is the right way to implement Keyed Password Hashing?

As mentioned in this wonderful link, the way to get a PBKDF2 Hash of a user given password given a password (of course), a salt (generated Cryptographically Secure Random Number Generator. iteration ...
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1answer
393 views

How many passwords should I have? [closed]

So I am upgrading my personal security. Most passwords that I use are generated by and stored in a password manager. There are a few places where I cannot use a password manager -- here, I plan to ...