saltedhash

I am new to storing passwords on databases and from what I read I have created a simple php script below <?php $salt = openssl_random_pseudo_bytes (16); $password = "test"; $hash = hash ("sha512" , $salt . $password); echo $hash; ?> Am I doing this correctly? Should the salt be stored in databases as byte datatype? Should the final hash be stored at String datatype in database? The SHA* algorithms are not appropriate to hash passwords, because they are ways too fast, and therefore can be brute-forced too fast. Instead one should use a slow algorithm like BCrypt or PBKDF2 with a cost factor,

I am working with a legacy application that stored passwords in plaintext. I have ported the application to spring 3 mvc + security. I have also successfully gotten spring security handling the authentication and authorization using sha256 + a salt based on the username. This all works great, however as part of the deployment, I will need to migrate the existing database to use the new password schema. I am not sure how spring security does it's password hashing with a salt, so i am unable to write a sql script that can be used to migrate the old plaintext passwords to the new sha256+salt

I need to implement a Forgot Password page, but my passwords are salted & hashed. So I can't retrieve them conventionally. My idea was to do the following: When an user clicks the Forgot Password link, they naturally need to type in their email address (which is also their username). Their password gets reset to a hashed & salted password i made. Then, i send an email to them which contains a link to a new page where they can type in their new password. The link contains the new hashed & salted password (as a $_GET variable) which is just for authentication purposes. I just grab the $_GET

I want to set up a system where I am allow to migrate encrypted password (hash password), from one system to another. How would i do this? Say 2 month down the line, i found a encryption that is 10 times better and the current hash function has been proven without a doubt, totally vulnerable. How would I go about migrating user password from one type of hash to another (the better one). You can slowly migrate from a method to another using the following technique. I cannot guarantee its quality so please take it with a grain of salt (pun not intended). For example, consider the following table

I have been looking through ths hashlib documentation but haven't found anything talking about using salt when hashing data. Help would be great. Rakis Samir's answer is correct but somewhat cryptic. Basically, the salt is just a randomly derived bit of data that you prefix or postfix your data with to dramatically increase the complexity of a dictionary attack on your hashed value. So given a salt s and data d you'd just do the following to generate a salted hash of the data: import hashlib hashlib.sha512( s + d ).hexdigest() See this wikipedia article for more details Just add the salt to

Ok, I’m trying to understand the reason to use salt. When a user registers I generate a unique salt for him/her that I store in DB. Then I hash it and the password with SHA1. And when he/she is logging in I re-hash it with sha1($salt.$password) . But if someone hacks my database he can see the hashed password AND the salt. Is that harder to crack than just hashing the password with out salt? I don’t understand … Sorry if I’m stupid … If you don't use a salt then an attacker can precompute a password<->hash database offline even before they've broken into your server. Adding a salt massively

I was reading a few articles on salts and password hashes and a few people were mentioning rainbow attacks. What exactly is a rainbow attack and what are the best methods to prevent it? Vilx- The wikipedia article is a bit difficult to understand. In a nutshell, you can think of a Rainbow Table as a large dictionary with pre-calculated hashes and the passwords from which they were calculated. The difference between Rainbow Tables and other dictionaries is simply in the method how the entries are stored. The Rainbow table is optimized for hashes and passwords, and thus achieves great space