Why is SHA256 bad for passwords?
A good hash algorithm makes it impossible to reverse the hash value to compute the original text. However, passwords are very, very short. By making a guess at a password, the attacker can compare the output of his SHA-256 against the SHA-256 that he finds in the database.
Is argon2 better than sha256?
Due to the higher collision propability of passwords with sha-256 the use of sha-512 is more recommended. That means in fact: In case of a rainbowtable-attack the passwords hashed with sha-256 algorithm are easier to crack.
Is argon2 better than SHA256?
Is the SHA-256 + salt still safe for password storage?
I am developing a website which requires users to register to it in order to use it’s functions and I was wondering if SHA-256 + salt (random salt provided by RNGCryptoServiceProvider in C#) is secure and good enough to use in 2017? For password storage, salted SHA256 hashes are not recommended.
What kind of hash function is SHA 256?
SHA-256 is a hash function: it takes oneinput, and produces an output. If you feed SHA-256 with a password anda salt, then you are really defining your own cryptographic protocols, based on SHA-256 with some extra things, the extra things telling how the password and the salt are combined to make the SHA-256 input.
Which is construct uses iterations of SHA-256?
The construct you’re looking for that uses SHA-256 is PBKDF2-HMAC-SHA-256, which uses iterations of HMAC-SHA-256, which is simply HASH (Key XOR opad, HASH (Key XOR ipad, text)) where ipad and opad are fixed values (sized for SHA-256). PBKDF2 (RFC2898) iterates them as such:
When to use high iteration count in hashing?
You should always use as high an iteration count/work factor as your system can handle with reasonable responses, understanding that your side will be single-threaded (hashing the one provided password), while the attacker will be parallel (trying many possible passwords simultaneously).