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What are salted hashes and what benefit do they provide?
A cryptographic salt is made up of random bits added to each password instance before its hashing. Salts create unique passwords even in the instance of two users choosing the same passwords. Salts help us mitigate hash table attacks by forcing attackers to re-compute them using the salts for each user.
What is salting and how does it improve security?
Salting refers to adding random data to a hash function to obtain a unique output which refers to the hash. These hashes aim to strengthen security, protect against dictionary attacks, brute-force attacks, and several others. Most commonly, salting is used in common passwords to strengthen them.
What happens when you add salt to a hash table?
Consequently, the unique hash produced by adding the salt can protect us against different attack vectors, such as hash table attacks, while slowing down dictionary and brute-force offline attacks. However, there are limitations in the protections that a salt can provide.
What happens if there is no salt to hash passwords?
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. The kinds of attacks we’re talking about here are offline attacks against compromised/exfiltrated data.
What is the difference between hashing and salting?
Hashing is a one-way function where data is mapped to a fixed-length value. Hashing is primarily used for authentication. Salting is an additional step during hashing, typically seen in association to hashed passwords, that adds an additional value to the end of the password that changes the hash value produced.
Why does it take so long to hash a password?
Yes. A typical way to add a salt is to concatenate it to the password, so hashing it will take just a little bit longer to add the extra bytes to the hash. In case of a password hashing function, you want it to be slow in order to slow down brute force attacks.