Suppose that a given password system uses 18 character passwords with 128 possib

Question

Suppose that a given password system uses 18 character passwords with 128 possible choices for each character.

a) If password P is stored as h(P,S), where S is the salt value corresponding to the password, what is the attacker's expected work to crack the password?

b) If Password P is stored as h(L, S1) , h(R, S2), where L is the first 6 characters of the password, R is the remaining 12 characters of the password and S1/S2 are the salt values, what is the attacker's expected work to crack the password?

Explanation / Answer

The password are usually craacked by two method

When we use salt value the it is difficult for the attackers to crack the password`

Eventhough the hash value can be cracked easily using the same dictionary attack if the salt value has the following constrain,

if two person using same password and the salt value is reused then the hash value will be same.then it is easy for the attackers to identify the password.is short then the password will be identified using dictionary look up.

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