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

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0
votes
1answer
66 views

Secure way to encrypt (not hash) passwords?

I'm building a system that for reasons I'll outline below, can't used hashed passwords, but I'd still like to encrypt them so that it's as hard as possible to crack them, in the (unlikely) event the ...
19
votes
4answers
769 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 ...
69
votes
4answers
14k views

Recommended # of iterations when using PKBDF2-SHA256?

I'm curious if anyone has any advice or points of reference when it comes to determining how many iterations is 'good enough' when using PBKDF2 (specifically with SHA-256). Certainly, 'good enough' is ...
0
votes
0answers
284 views

Thunderbird password decryption from the signons.sqlite and keys3.db without using any third party tools

I understand from the Mozilla documentations that the passwords are stored in the following two files which are located at ~/.thunderbird/*.default location: ( I use Ubuntu 13.10) signons.sqlite ...
0
votes
0answers
45 views

Full key space coverage when generating a rainbow table

Many rainbow tables available online have different tables for various character sets and lengths. Are tables like these usually completely exhaustive for those character sets/lengths? For such a ...
2
votes
2answers
115 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 ...
1
vote
2answers
42 views

Should a password ever be presented in plain text to a user (On a website)? Is this illegal under UK Data protections act? [on hold]

There is a website I use at work, external to our own. They have just presented with every employee with their plain text password and username via our internal website which requires our own logins. ...
91
votes
17answers
22k views

Is “password knocking” a good idea?

With port knocking, you have to "knock" on specific ports in defined order to expose a port on which service is running. How about password knocking? For example you have three passwords: A, B and C. ...
22
votes
7answers
5k 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 ...
12
votes
6answers
2k views

Do salts have to be random, or just unique and unknown?

First of all, my motive is to avoid storing the salt in the database as plain text. As far as this question is concerned, the salt is not stored in the database. After discussion in comments and in ...
59
votes
5answers
18k views

Is sending password to user email secure?

How secure is sending passwords through email to a user, since email isn't secured by HTTPS. What is the best way to secure it? Should i use encryption?
25
votes
8answers
2k views

Why is password hashing considered so important?

After reading this article, I can see the benefits of password hashing as a second layer of defence, in the event of an intruder gaining access to a password database. What I still don't understand is ...
31
votes
7answers
9k views

Is salting a hash really as secure as common knowledge implies?

(I did search on this topic, but I found no complete question/answer that addressed it, or even good portions of questions that might be relevant.) I'm implementing a salt function for user passwords ...
65
votes
3answers
20k views

How does Google Authenticator work?

Google Authenticator is an alternative to SMS for 2Step verification, installing an app on Android where the codes will be sent. It works without any connectivity; it even works on plane mode. This ...
7
votes
1answer
190 views

Are these SSH passwords of hacked servers?

I have been seeing persistent SSH connection attempts on my computer from a familiar IP address. I got curious and decided to do some Googling on the IP address. Turns out that someone from Indonesia ...
1
vote
1answer
33 views

Using a Cryptovariable with an API Designed for Human-Generated Passwords

I'm working with a vendor who provides an API with a user registration method clearly designed for human-generated passwords. We're calling the API in an offline server-to-server fashion, however, ...
28
votes
4answers
12k views

Standards for encrypting passwords in configuration files?

My workplace has a standard that plaintext passwords are not allowed in application configuration files. This makes enough sense on its face, in case someone gets access to the config files they ...
-5
votes
0answers
51 views

Link to more active security sites? [on hold]

I have a BS/MS in Computer Science and have worked as a developer for 15 years. Currently I have been reading a lot about computer security. Serverfault and Stackoverflow seem to be the go to place ...
-2
votes
0answers
21 views

How i can secure authentication with php? [on hold]

I have an identification with id and password , after the user enters the ID and password, then script php search in the database ( mysql) if the id and password exists in the table. Can you tell me ...
2
votes
3answers
103 views

Acceptably secure solution for users to log in with a short unique code only (no username)

I am creating a website whereby users are given an account by invitation only, and are sent a unique code by post. Users can then log in (at least the first time) by entering the code only. The goal ...
3
votes
3answers
11k views

Is it possible to brute force all 8 character passwords in an offline attack?

This article states: Brute-force techniques trying every possible combination of letters, numbers, and special characters had also succeeded at cracking all passwords of eight or fewer characters. ...
313
votes
11answers
58k views

How to securely hash passwords?

If I hash passwords before storing them in my database, is that sufficient to prevent them being recovered by anyone? I should point out that this relates only to retrieval directly from the ...
42
votes
4answers
5k views

Is it good practice to ban an IP address if too many login attempts are made from it?

Since an IP address does not necessarily represent a specific device, but probably a whole network/company/etc. does it at all make sense to block an IP address if there is a significant amount of ...
6
votes
1answer
217 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 ...
-2
votes
2answers
116 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
0answers
47 views

Tools to create dictionary with word-combos? [closed]

I'm studying to take a job as a pentester, and specifically how to crack wpa/wpa2 security. I've been able to use aircrack/airodump to capture a handshake, and I know at this point it's just a matter ...
2
votes
2answers
134 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 ...
15
votes
6answers
3k views

Managing website passwords for small team

I'm part of a small group of people who manage a website and the server it runs on. We have many accounts with third-party websites or services that multiple people on the team need to access. What is ...
4
votes
1answer
548 views

Is it a good idea to use two salts? [duplicate]

Is it a good idea to use two salts? This is implying that one would be unique to the user, and one would be unique to the server, using Bcrypt of course. So for example, if you're using Golang as ...
-2
votes
2answers
69 views

Password hashing and blowfish [duplicate]

What I'm about to say is probably going to make me look like an idiot but it's better to be wrong and learn than have unanswered questions. Ever since I started dealing with passwords I wondered what ...
0
votes
0answers
16 views

Best practise Managing Key Material Securely in Memory in android

I am aware of the issue of user entered pass phrases being left in memory if stored in Java Strings (due to String being immutable). Which takes me onto using char arrays. However, I am wondering if ...
1
vote
2answers
90 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. ...
7
votes
4answers
385 views

Decentralised password recovery

Are there good/established techniques for password/key recovery in situations without a centralised service? (Anything goes, but I'd prefer solutions that distribute the recovery information across ...
2
votes
1answer
66 views

SIP Provider stores credentials, is it required for some SIP phones?

My SIP provider stores my SIP call time password as AES encrypted in stead of hashed. I understand that SIP authentication has the capability to NOT store the password, and in stead store a ...
2
votes
1answer
99 views

Is this a secure way to generate passwords at the command line?

Occasionally I need to generate a password while working at the Unix command line. I have the following alias in my zshrc: alias randpass='openssl rand -base64 32 | tr -d /=+ | cut -c -30' These ...
0
votes
1answer
40 views

Gnome-keyring iteration count location

I know that Gnome-keyring hashes master password between 1000 and 2000 times. It picks random number. I would like to ask where does it save this number, what is the location of that file? As far as I ...
4
votes
2answers
204 views

Best way to store/retrieve sensitive key files?

We have our web servers running in AWS EC2. We have about 30 API Keys/passwords/etc (sensitive data) which is set in the environment for our app to use. Whenever we deploy, we start a new server ...
0
votes
1answer
86 views

Can Google's administrators be trusted with Google Authenticator? [duplicate]

Suppose there is an evil Google administrator who has full access to every server or network at Google. Will such a person be able to abuse the Google Authenticator technology to gain access to ...
3
votes
1answer
121 views

Best practices for passwords on registration?

I have a website which users register an account. On the registration field, the form fields are: Name Email Confirm email Username But there is no password field. When they hit submit, they are ...
1
vote
2answers
47 views

Hashing password with salt [duplicate]

I read from wiki: The attacker has access to both the hashed password and the salt, so when running the dictionary attack, the attacker can simply use the known salt when attempting to crack the ...
2
votes
1answer
888 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
votes
1answer
48 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 ...
0
votes
1answer
94 views

Passwords propagation, Password Trend and Word Generator in Human Mind

Some passwords like "123456", "admin" are outrageously popular, so are the leet transformations and concatenation of digits. The users seem to pick up the password suggestions or just copy the ...
1
vote
3answers
81 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 ...
1
vote
2answers
69 views

Is it safe to store a passphrase encrypted SSH key in git?

I have a bunch of servers that need to access somewhat sensitive data (passwords for ftps, api keys, etc). Currently I copy a plaintext file back-and-forth between the servers via ssh and encrypt all ...
7
votes
7answers
1k views

Facebook account keeps getting hacked, can't seem to figure out why or how?

One of my mate, she has a lot of friends on Facebook, uses it for marketing. Her account keeps getting broken into. Her password gets reset and/or gets locked for changing resetting password too many ...
3
votes
3answers
409 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 ...
27
votes
7answers
3k views

What is a good way to authenticate a user to a smart phone?

What would be a good way to authenticate a user to a smart phone? By good, I mean that it is both secure, and user-friendly. Passwords don't seem to be the best fit because a password needs to be ...
4
votes
1answer
6k views

Why is it considered safe for services like Mint to store bank password?

My understanding is that, typically websites are recommended to store only hashes of passwords using one-way cryptographic hash function. This way, there is no way to retrieve the passwords even when ...
0
votes
1answer
36 views

MDM: Semi-Complex Password Implications [duplicate]

What would be the security implications if an organisation decided to impliment semi-complex passwords (one letter and one letter), and not fully complex. I'm thinking in terms of mobile devices and ...