How are salts generated?
A new salt is randomly generated for each password. Typically, the salt and the password (or its version after key stretching) are concatenated and fed to a cryptographic hash function, and the output hash value (but not the original password) is stored with the salt in a database.
What is a good salt for password?
The classical recommendation for a salt for password hashing is: A random value of 128 bits or more; obtained from a cryptographically sound random number generator ( /dev/random or /dev/urandom on modern day Unixes); unique for each entry (i.e. don’t re-use the same salt, generate a new salt for each new password);
How are salt used in the hashing of passwords?
Recap 1 A cryptographic salt is made up of random bits added to each password instance before its hashing. 2 Salts create unique passwords even in the instance of two users choosing the same passwords. 3 Salts help us mitigate hash table attacks by forcing attackers to re-compute them using the salts for each user.
What happens if there is no salt in hashing?
Sees duplicate hashes. Attacker can arrive to conclusion that there’s no salts or using a weak algo to hash the passwords. If they find a lot of the same hashes, sign that server has a default password and every new acct has a default password.
Why do user names spread hashes around less than a random salt?
Because user names have lower entropy than a random salt, so they spread your hashes around less than a proper salt does. Not that the example on that page is very spectacular anyway.
Can you find Jason’s password based on the hash?
Can you find what is jason ‘s password based on the hash 695 ddccd984217fe8d79858dc485b67d66489145afa78e8b27c1451b27cc7a2b? Attacker gets DB. Sees duplicate hashes. Attacker can arrive to conclusion that there’s no salts or using a weak algo to hash the passwords.